Wednesday 16 October
13:30

"Wednesday 16 October"

Added to your list of favorites
Deleted from your list of favorites
BFAS-presymp
13:30 - 16:00

BFAS-EFAS pre-meeting (15 mins each + 5 mins Q&A)

13:30 - 16:00 Moderators. Laurent GOUBAU (Foot and Ankle Surgeon) (Moderator, Ghent and Brussels, Belgium), Geoffroy VANDEPUTTE (MD) (Moderator, Lier, Belgium)
13:30 - 13:40 Welcome and Introduction. Kristian BUEDTS (Md) (Speaker, Brussels, Belgium), Laurent GOUBAU (Foot and Ankle Surgeon) (Speaker, Ghent and Brussels, Belgium)
13:40 - 14:00 How innovation in Materials and Techniques in Forefoot Surgery has changed my practice in the last 10 years, or not? Manfred THOMAS (Head of department) (Speaker, Augsburg, Germany)
14:00 - 14:20 How innovation in understanding the sagittal plane has changed my practice in the last 10 years, or not? Manuel MONTEAGUDO (CONSULTANT ORTHOPAEDIC SURGEON) (Speaker, Madrid, Spain)
14:20 - 14:40 How innovation in distal tibia osteotomy has changed my practice in the last 10 years, or not? Jean BRILHAULT (Speaker, Trelaze, France)
14:40 - 15:00 How innovation in TAR has changed my practice in the last 10 years, or not? Timothy DANIELS (Delegate, Canada)
15:00 - 15:20 How innovation in TAR and TAA has changed my practice in the last 10 years, or not? Pascal RIPPSTEIN (head) (Speaker, Zürich, Switzerland)
15:20 - 15:40 How innovation in MIS fusions has changed my practice in the last 10 years, or not? Alastair YOUNGER (Professor) (Speaker, Vancouver, Canada)
15:40 - 16:00 How innovation in cartillage repair has changed my practice in the last 10 years, or not? Federico USUELLI (Speaker, Italy)
AQUARIUM
16:00

"Wednesday 16 October"

Added to your list of favorites
Deleted from your list of favorites
C0
16:00 - 16:30

COFFEE BREAK

16:30

"Wednesday 16 October"

Added to your list of favorites
Deleted from your list of favorites
BFAS-presym
16:30 - 17:00

BFAS-EFAS pre-meeting

16:30 - 17:00 Contributions of the international fellows.
17:00 - 17:00 End of BFAS Pre-Congress.
AQUARIUM
Thursday 17 October
08:00

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
R1
08:00 - 08:30

Registration

WELCOME DESK
08:30

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
OC
08:30 - 08:40

Opening Ceremony

Speakers: Kristian BUEDTS (Md) (Speaker, Brussels, Belgium), Manuel MONTEAGUDO (CONSULTANT ORTHOPAEDIC SURGEON) (Speaker, Madrid, Spain), Manfred THOMAS (Head of department) (Speaker, Augsburg, Germany)
AUDITORIUM
08:40

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
PS1
08:40 - 10:00

PLENARY SESSION 1: NEUROFOOT/ANKLE

08:40 - 10:00 Moderators. Jean-Luc BESSE (Praticien Hospitalier) (Moderator, Lyon, France), Joris HERMUS (Orthopedic surgeon) (Moderator, Maastricht, The Netherlands)
08:40 - 08:50 Subtle flexible cavovarus. Manfred THOMAS (Head of department) (Speaker, Augsburg, Germany)
08:50 - 09:00 Severe rigid deformity. Elena SAMAILA (Associated Professor) (Speaker, Verona, Italy)
09:00 - 09:10 The triceps – when/how to lenghten and when not. Jan Willem LOUWERENS (orthopaedic surgeon) (Speaker, Nijmegen, The Netherlands)
09:10 - 09:20 When to transfer tendons and soft tissue balancing? Norman ESPINOSA (Owner / Member) (Speaker, Zurich, Switzerland)
09:20 - 09:30 Charcot-Marie-Tooth. Senthil KUMAR (Consultant Orthopaedic Surgeon) (Speaker, Glasgow, United Kingdom)
09:30 - 10:00 Discussion.
AUDITORIUM
10:00

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
CB1
10:00 - 10:30

Coffee Break, Exhibition and Poster Walks

10:30

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
SY1
10:30 - 11:30

SYMPOSIUM: Most relevant EFAS publications (2022-2024)

10:30 - 10:42 EFAS in depth: our journal, your journal. Martinus RICHTER (Director) (Speaker, Rummelsberg, Germany)
10:42 - 10:54 Trends in publishing papers in foot and ankle surgery. Ian WINSON (Consultant Orthopaedic and Trauma Consultant) (Speaker, Bristol, United Kingdom)
10:54 - 11:00 Most relevant 1 - Distraction arthroplasty in the management of osteoarthritis of the ankle: A systematic review. Arshad ZAKI (Student) (Speaker, Cambridge, United Kingdom)
11:00 - 11:06 Most relevant 2 - Diagnostic applications and benefits of weightbearing CT in the foot and ankle: A systematic review of clinical studies.
11:06 - 11:12 EFAS Best Paper Award.
11:12 - 11:30 Discussion.
AUDITORIUM

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
SY2
10:30 - 11:30

SYMPOSIUM: Removal of Metalwork in the Foot and Ankle

Moderators: Norman ESPINOSA (Owner / Member) (Moderator, Zurich, Switzerland), Manuel SOUSA (Foot and Ankle Surgeon) (Moderator, Lisbon, Portugal)
10:35 - 10:45 When and why? Jesus VILA Y RICO (Chief of Department) (Speaker, Madrid, Spain)
10:45 - 10:55 Tips and tricks for difficult removals. Karan MALHOTRA (Consultant Orthopaedic Surgeon) (Speaker, London, United Kingdom)
10:55 - 11:05 Any role for bioabsorbable implants? Helka KOIVU (Consultant) (Speaker, Turku, Finland)
11:05 - 11:15 Metal hypersensitivity/allergy. James RITCHIE (orthopaedic Foot and Ankle Surgeon) (Speaker, Tunbridge Wells, United Kingdom)
11:15 - 11:30 Discussion.
STUDIO
11:35

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
BSFFAF
11:35 - 12:30

BSFFAF: Brussels Short Film Foot and Ankle Festival

11:35 - 12:30 Moderators:. Helka KOIVU (Consultant) (Moderator, Turku, Finland), Jesus VILA Y RICO (Chief of Department) (Moderator, Madrid, Spain)
11:35 - 11:43 Youngswick osteotomy for Hallux Rigidus? Alessio BERNASCONI (Foot and Ankle - Orthopaedic Surgeon) (Speaker, Napoli, Italy)
11:43 - 11:51 TAR. Johnny FRØKJÆR (consultant foot and ankle surgeon) (Speaker, Odense, Denmark)
11:51 - 11:59 Lateral ankle instability – personal technique. Yves TOURNÉ (Chirurgien) (Speaker, Grenoble, France)
11:59 - 12:07 Calcaneal osteotomy with plate and screws. Paulo AMADO (Director of Orthopedic Departement) (Speaker, Porto, Portugal)
12:07 - 12:30 Discussion.
AUDITORIUM

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
F1
11:35 - 12:30

Paediatric Foot and Ankle FORUM:

11:35 - 12:30 Moderators. Anja HELMERS, Christina STUKENBORG-COLSMAN (XXX) (Speaker, Hannover, Germany)
11:35 - 11:45 What is a symptomatic flatfoot? Maurizio DE PELLEGRIN
11:45 - 11:55 Which is the best method to document flatfoot deformity? Martin Michael WACHOWSKY
11:55 - 12:05 Is flatfoot in adults the result of untreated flatfoot in children? Antonio MAZZOTTI (Orthopaedic Surgeon) (Speaker, Bologna, Italy)
12:05 - 12:30 Discussion.
STUDIO
12:15

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
L1
12:15 - 14:30

Lunch, Exhibition, Industry Workshops and Poster Walks

EXHIBITION AREA
12:40

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
PWK1
12:40 - 13:00

Poster Walks presentations 1
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Peter BOCK (Vienna, Austria), Matthew WELCK (Efas youth committee) (london, United Kingdom)
12:40 - 13:00 #40849 - PWK01 Does prior anterior talofibular ligament dysfunction protect from development of deep deltoid ligament laxity? A cadaveric study.
Does prior anterior talofibular ligament dysfunction protect from development of deep deltoid ligament laxity? A cadaveric study.

Introduction In Adult Acquired Flatfoot Deformity (AAFD), progression to anteromedial ankle instability (AMI) prior to complete deltoid ligament rupture is not fully understood. Clinical observations suggest reduced deep deltoid ligament (DD) laxity and AMI in the presence of anterior talofibular ligament (ATFL) laxity. The protective effect of ATFL rupture/laxity (the most common foot ligament injury) has on mitigating the development DD laxity and AMI in AAFD has not been investigated to date. Methods Unstable planus was induced in 12 cadaveric feet from 6 donors and paired feet were randomly assigned to having ATFL sectioned or intact. Feet underwent cyclic loading (2000 cycles) on a custom-mounted jig and photos were taken with positional markers on the medial malleolus, fibula, and the talus before and after antero-posterior force application. ImageJ quantified anteromedial and anterolateral ankle joint displacement to reflect DD and ATFL laxity respectively. Results In ATFL-intact feet, anteromedial displacement increased by 3.46 ± 0.41 µm/cycle (mean ± SD; P = 0.000005; two-tailed, one-sample t-test). In ATFL-sectioned feet, displacement increased 0.61 ± 0.66 µm/cycle (p = 0.072), an 82% reduction in DDL laxity development (P = 0.00006; two-tailed, paired t-test). Absolute anterolateral displacement increased in ATFL-sectioned feet by 7.40 ± 0.12 mm (p = 0.00002). Conclusion These findings corroborate our clinical findings; in AAFD/PCFD, feet with ATFL laxity paradoxically do not develop DD laxity and AMI, which we ascribe the ‘deep deltoid paradox sign’. There are implications for surgical management of ATFL ruptures, and AAFD classifications may require updating.
Zhikai LI (Cambridge, United Kingdom), Zhiheng LI, Gavin JARVIS, Stephanie POTTEN, Cecilia BRASSETT, Chandra PASAPULA
12:40 - 13:00 #42584 - PWK02 Axial rotation analysis in total ankle arthroplasty using weight-bearing computer tomography and three-dimensional modeling.
Axial rotation analysis in total ankle arthroplasty using weight-bearing computer tomography and three-dimensional modeling.

Background Post-operative alignment is the most critical indicator for a successful total ankle arthroplasty (TAA). Total ankle malrotation is associated with an increased risk for polyethylene wear and medial gutter pain. Currently, there is no consensus on the correct way to measure the alignment of the tibial and talar component rotations in the axial plane. In the current study, the post-operative analysis system was assessed using weight-bearing computer tomography and a three-dimensional (3D) model. The purpose of the study was to assess the inter-observer and intra-observer agreement of this system. Material and method Four angles were measured by two raters independently in two separate readings: posterior tibial component rotation angle (PTIRA), posterior talar component rotation angle (PTARA), tibia talar component axial angle (TTAM), and tibial component to the second metatarsal angle (TMRA). Agreement analysis was quantified according to the interclass coefficient. Results Sixty TAAs across 60 patients were evaluated. A good inter-observer agreement and intra-observer agreement when measuring the PTIRA, PTARA, and TTAM angles was observed along with an excellent inter-observer agreement and intra-observer agreement when measuring the TMRA angle. Conclusion In conclusion, the current 3D model-based measurement system demonstrates good to excellent inter and intra-agreement. According to these results, 3D modelling can be reliably used to measure and assess the axial rotation of TAA components.
Efrima BEN, Agustin BARBERO (Milan, Italy), Joshua OVADIA, Cristian INDINO, Camilla MACCARIO, Federico USUELLI
12:40 - 13:00 #42714 - PWK03 Failure of ankle arthroplasty - Predictive factors for revision procedures.
Failure of ankle arthroplasty - Predictive factors for revision procedures.

The study aimed to analyze revision procedures after failed total ankle arthroplasty (TAA), including polyethylene exchange (PEE), revision total ankle arthroplasty (RTAA), and revision ankle arthrodesis (RAA). Method The cohort comprised 194 patients (106 men, 88 women). The mean age was 62.02 ± 11.83 years. The data was prospectively collected as part of the National Ankle Arthroplasty Registry. The average follow-up (FU) was 74.65 ± 47.18 months. Endpoints were a new revision and/or an unsatisfactory outcome in the EFAS score (< 10). AI algorithms, univariate Cox proportional hazards regression models, multiple logistic regression, and decision tree analysis were applied. Results and conclusion 70 patients underwent PEE, 52 underwent RTAA, and 72 underwent RAA. The failure rate (repeat revision and/or EFAS score < 10) over a 5-year observation period was 35.45%, with actual surgical revisions accounting for 23.27%. PEE, as an isolated procedure, had the highest rate of repeat revision and poor outcomes (38.57%), while RAA (31.94%) and RTAA (32.69%) showed statistically significant differences. The most decisive negative predictive factor for surgical revision was periprosthetic infection (PJI) (p=0.0001) and periprosthetic ossifications (P = 0.001) for an EFAS score < 10. In PEE, osteotomies for axis correction had a significant positive effect on the outcome (p=0.01), while increased BMI had a negative impact. In RTAA, preoperative osteolysis >1 cm in diameter was associated with a significantly higher failure rate (p=0.005). Conclusion: The analysis of predictive factors allows a selection of the most promising treatment concept for each patient.
Markus WALTHER (München, Germany), Kathrin PFAHL, Anke RÖSER
12:40 - 13:00 #42915 - PWK04 Recovery Curve of Prospectively Collected Patient-Reported Outcome Measurement Information System (PROMIS) in Total Ankle Arthroplasty.
Recovery Curve of Prospectively Collected Patient-Reported Outcome Measurement Information System (PROMIS) in Total Ankle Arthroplasty.

Objectives: To determine the post-operative recovery curve of patients undergoing total ankle arthroplasty (TAA) for end stage ankle arthritis using Patient-Reported Outcome Measurement Information System (PROMIS) for physical function (PF), pain interference (PI), and depression (DP). Methods: Prospectively collected pre-operative and post-operative PROMIS scores including PF, PI and DP were collected for 127 feet in 123 patients undergoing TAA between 2018 and 2023 for up to one year after surgery. Patients were excluded if they had a prior history of infection, revision TAA and lacked pre-operative or post-operative PROMIS scores. A Linear mixed model was used to predict improvement in PROMIS scores at different time points during recovery. Results: Mean follow-up time in which PROMIS scores were collected post-operatively was 238 ± 135days. Mean PF, PI and DP at 1 year was 43±5, 54±8 and 45±8 respectively. A normal PF score was achieved in 87.5% of patients, 64.3% achieved a normal PI score, and 60% achieved a normal DP score at one year from surgery. Predicted change of improvement for each PROMIS subset were calculated at 3, 6 and 12 months post-operatively. For PF scores improved by 1, 3 and 5 respectively. For PI scores improved by 1, 3 and 5 respectively. For DP scores improved by 0, 2 and 3 respectively. Conclusion: Most patients reach normal PROMIS scores at one year from surgery after TAA. Improvement plateaued at 6 months post-operatively suggesting that the first 6 months after surgery are the most crucial in the recovery period.
Andres PISCOYA, Callie LIU, Stephanie CHEN (Los Angeles, USA), Zachary ROCKOV, David THORDARSON, Timothy CHARLTON
13:10

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
PKW2
13:10 - 13:30

Poster Walks presentation 2
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Oliver MICHELSSON (Consultant) (Helsinki, Finland), Stephan WIRTH (Head of foot and ankle surgery) (Zürich, Switzerland)
13:10 - 13:30 #42582 - PWK05 Significant clinical improvement after arthroscopic autologous matrix-induced chondrogenesis for osteochondral lesions of the talus: A 5-year follow-up.
Significant clinical improvement after arthroscopic autologous matrix-induced chondrogenesis for osteochondral lesions of the talus: A 5-year follow-up.

Purpose This study aims to evaluate the clinical outcomes of arthroscopic autologous matrix-induced (A-AMIC) chondrogenesis for osteochondral lesions of the talus (OLT) at 24 months and 60 months of follow-up. The secondary aim was to assess whether age, body mass index (BMI), and lesion surface affect outcomes. Design Sixty-three patients (32 males, 31 females) with a median age of 37 years [IQR 25-48] were included. Preoperative and postoperative (24 months and 60 months) clinical outcomes were evaluated using a Visual Analog Score (VAS) for pain during walking, the American Orthopedic Foot and Ankle Society (AOFAS), Short-Form Survey (SF-12), the Halasi, and the University of California (UCLA) scores. Patients were categorized according to age, BMI, and lesion surface (1-1.5 cm2 and over 1.5 cm2). The effect of each category was evaluated. Results There were significant improvements in the VAS, AOFAS, SF12, and UCLA, comparing the preoperative scores to the 60-month follow-up scores (p < 0.001). There were no significant differences in the above-mentioned outcomes between the follow-up periods. Patients older than 33 had lower SF-12, Halasi, and UCLA scores (p-value = 0.005, 0.004, and <0.001, respectively). Overweight patients had lower VAS, SF-12, Halasi, and UCLA scores (p-value = 0.006, 0.002, 0.024, and 0.007). Lesion size was uninfluential. Conclusion A-AMIC yielded clinical improvements at a minimum follow-up of 60 months in patients with symptomatic OLTs, with clinical improvement peaking in the first two years, followed by a plateau period. Increased age and BMI were significantly associated with inferior outcomes.
Efrima BEN, Agustin BARBERO (Milan, Italy), Camilla MACCARIO, Cristian INDINO, Chiara NOCERA, Jari DAHMEN
13:10 - 13:30 #42980 - PWK06 Osteochondral Repair With Autologous Cartilage Transplantation With or Without Bone Grafting: A Short Pilot Study in Mini-pigs.
Osteochondral Repair With Autologous Cartilage Transplantation With or Without Bone Grafting: A Short Pilot Study in Mini-pigs.

Objective: Treatment strategies for osteochondral defects, for which particulated autologous cartilage transplantation (PACT) is an emerging treatment strategy, aim to restore the structure and function of the hyaline cartilage. Herein, we compared the efficacy of PACT with control or human transforming growth factor-β (rhTGF-β), and clarified the necessity of bone grafting (BG) with PACT to treat shallow osteochondral defects in a porcine model. Design: Two skeletally mature male micropigs received 4 osteochondral defects in each knee. The sixteen defects were randomized to 1) empty control, 2) PACT, 3) PACT with BG, or 4) rhTGF-β. Animals were euthanized after 2 months, and histomorphometry, immunofluorescence analysis, semi-quantitative evaluation (O’Driscoll score), and magnetic resonance Observation of Cartilage Repair Tissue (MOCART) score were performed. Results: Hyaline cartilages, glycosaminoglycan synthesis, and collagen type II staining were more abundant in the PACT than the control and rhTGF-β groups. The O’Driscoll score was significantly different between groups (P < 0.001), with both PACT groups showing superiority (P = 0.002). PACT had the highest score (P = 0.002), with improved restoration of subchondral bone compared to PACT with BG. The MOCART score showed significant differences between groups (P = 0.021); MOCART and O’ Driscoll scores showed high correlation (r = 0.847, P < 0.001). Conclusion: Treatment of osteochondral defects with PACT improved tissue quality compared to that with control or rhTGF-β in a porcine model. BG in addition to PACT may be unnecessary for shallow osteochondral defects.
Dong Woo SHIM (Seoul, Republic of Korea), Wonwoo LEE, Yeokwon YOON, Kwang Hwan PARK, Seung Hwan HAN, Jin Woo LEE, Bom Soo KIM
13:10 - 13:30 #42984 - PWK07 Clinical and Radiologic Outcomes of Modified Broström Techniques: A Comparative Study on Arthroscopic Ultrasound-assisted and Open Approaches.
Clinical and Radiologic Outcomes of Modified Broström Techniques: A Comparative Study on Arthroscopic Ultrasound-assisted and Open Approaches.

Background Despite the growing utilization of Ultrasound-Guided Arthroscopic Modified Broström Operation (MBO), comparative studies assessing its clinical outcomes and recurrence rates relative to the open surgical approach remain scarce. The purpose of this study was to compare the clinical and radiologic outcomes between patients undergoing ultrasound-guided arthroscopic MBO and those undergoing open MBO. Material and methods This retrospective study evaluated 66 patients with chronic lateral ankle instability who underwent MBO between January 2020 and April 2023, including only those with at least one year of follow-up, with 35 in the arthroscopic group and 31 in the open group. Clinical outcomes were assessed using the Foot and Ankle Outcome Score (FAOS) preoperatively and at 3, 6, and 12 months postoperatively. Radiologic outcomes were evaluated by measuring the anterior talar translation and talar tilt angle from stress radiographs at the same intervals. Results Both surgical procedures resulted in significant improvements in pain, instability, recurrence rate, and FAOS scores at one year postoperatively. No significant differences were observed between the groups in preoperative demographics or outcomes at 3, 6, and 12 months postoperatively, including FAOS, anterior talar translation or talar tilt (all p > .05). Recurrence of instability was noted in two cases in the arthroscopic group and two cases in the open group. (p = .45) Conclusion Both techniques provide excellent clinical and radiologic outcomes for patients with chronic lateral ankle instability. Ultrasound guided arthroscopic MBO should be considered a viable alternative to open surgery for patients with chronic lateral ankle instability.
Younguk PARK, Younwook SEO (Seoul, Republic of Korea), Jinyoung JUN
13:10 - 13:30 #43072 - PWK08 Drain versus no drain after total ankle arthroplasty: are there any differences in complications rate?
Drain versus no drain after total ankle arthroplasty: are there any differences in complications rate?

Introduction: While the efficacy of closed suction drains has been extensively studied in hip, knee, and shoulder surgery, it lacks scientific evidence in the foot and ankle domain, especially after total ankle arthroplasty (TAA). Thus, this study aims to compare the incidence of post-operative complications with and without the application of a closed suction drain following TAA. Methods: A retrospective monocentric chart review of all patients who had undergone TAA with an anterior approach from January 2020 to March 2023 was performed. Data were analysed to assess the effect of drain usage on post-operative complications. Results: A total of 110 patients were enrolled, 59 in the drain group and 51 without a drain. The mean age at surgery was 58.4 (range, 28 – 81) years. No statistical differences were found between the two groups in the total complication rate (19.6% in no-drain group vs 20.3% in drain group, p= 0.227). Conclusions: This study showed no effect of applying a closed suction drain after TAA in the incidence of post-operative complications. Since the use of a drain did not negatively affect the outcome, nor did it provide a significant benefit, it can be asserted that there is no evidence to support the routine use of closed suction drains in TAA. Drains should be applied on an individual basis. Further high-level research is needed to confirm these results.
Elena ARTIOLI, Antonio MAZZOTTI (Bologna, Italy), Alberto ARCERI, Simone Ottavio ZIELLI, Laura LANGONE, Cesare FALDINI
13:35

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
PKW3
13:35 - 13:55

Poster Walks presentations 3
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Laurent GOUBAU (Foot and Ankle Surgeon) (Ghent and Brussels, Belgium), Bruno PEREIRA (Surgeon) (Braga, Portugal)
13:35 - 13:55 #42965 - PWP09 Clinical Outcomes Of All-Inside Arthroscopic Lateral Ankle Ligament Reconstruction For Chronic Lateral Ankle Instability: A Prospective Series With Minimum 12 Month Outcomes.
Clinical Outcomes Of All-Inside Arthroscopic Lateral Ankle Ligament Reconstruction For Chronic Lateral Ankle Instability: A Prospective Series With Minimum 12 Month Outcomes.

Background: Chronic lateral ankle instability (CAI) is a common condition that can be effectively treated with lateral ankle ligament reconstruction to restore ankle stability and function. The aim was to assess the functional outcomes of arthroscopic lateral ligament reconstruction using the Manchester-Oxford Foot Questionnaire (MOXFQ), Visual Analog Score (VAS) and Euroqol-5D-5L (EQ-5D) patient-reported outcome measures (PROMs). Methods: This prospective series included 36 consecutive patients who underwent isolated arthroscopic lateral ligament reconstruction for CAI between November 2020 and November 2022 with minimum 12-month follow up. All patients completed the MOXFQ, VAS, and EQ5D PROMs preoperatively, and 12 months postoperatively. The MOXFQ is a foot and ankle-specific PROM that assesses foot and ankle function, the VAS measures pain and the EQ5D evaluates general health-related quality of life Results: Patients were followed up for 12-25 months. In all patients, there was significant improvement in all postoperative PROMs (p<0.05). The MOXFQ index decreased from 59.1±19.2 to 13.5±18.1 (p<0.01), EQ-5D index increased from 0.607±0.224 to 0.854±0.175 (p<0.01) and VAS pain decreased from 36.6±22.3 to 13.6±18.4 (p<0.01).A total of 6 patients(16.3%) were lost to follow up and mean follow-up time was 1.63±0.54 years. Conclusion: Arthroscopic lateral ankle ligament reconstruction is an effective treatment for chronic ankle instability, with significant improvements in clinical and health-related quality of life outcomes.
Vikramman VIGNARAJA, Thomas LEWIS, Samuel FRANKLIN, Gabriel FERREIRA, Gustavo NUNES, Yasser ALJABI, Peter LAM, Robbie RAY (London, United Kingdom)
13:35 - 13:55 #43091 - PWP10 Evaluating tibiotalar joint coverage at varying high heel heights.
Evaluating tibiotalar joint coverage at varying high heel heights.

INTRODUCTION: While high heeled shoes (HH) are popular, studies have shown that HH can alter the strain of ligaments in the ankle, increasing risk of ankle instability. No studies have analyzed changes in ankle joint mechanics. This study aimed to evaluate changes in tibiotalar joint coverage at various HH heights using weight bearing computed tomography (WBCT) and coverage mapping. We hypothesized that as HH height increased, there would be reduced tibiotalar coverage due to increased plantarflexion. METHODS: 20 healthy, non-frequent HH wearing volunteers received a total of 4 bilateral WBCT scans: (1) control/no heel, (2) 3 cm heel, (3) 6 cm heel, (4) 9 cm heel. Scans were semi-automatically segmented to create three-dimensional bone mesh models using a commercially available software package. Manual selection of the talar dome was performed by two readers. Talar dome uncoverage was defined by distances and areas over a specific threshold distance of 5mm. Percent coverage was calculated by dividing the sum of triangulation areas below the threshold by the total sum of areas. RESULTS: Between all HH heights, there was a significant difference in tibiotalar coverage (p < 0.0001).The 6 cm and 9 cm groups relative to the control had significant differences in coverage (p < 0.05). The most significant uncoverage was found in the anteromedial aspect of the talar dome across all high heel heights. CONCLUSION: This study is the first of its kind to analyze changes in tibiotalar coverage in HH and builds upon the existing literature of ankle instability high heels.
Emily LUO (Durham, NC, USA), Grayson TALASKI, Andrew BEHRENS, Tania SZEJNFELD, Aaron THERIEN, Katherine KUTZER, Kevin WU, Kepler CARVALHO, Erik HUANUCO CASAS, Antoine ACKER, Cesar DE CESAR NETTO
13:35 - 13:55 #43147 - PWP11 Postoperative radiographs two weeks after ankle fracture fixation: a waste of resources and rarely justified.
Postoperative radiographs two weeks after ankle fracture fixation: a waste of resources and rarely justified.

Background British Orthopaedic Association Standards for Trauma and Orthopaedics (BOAST) guidelines recommend follow-up within six weeks after ankle fracture open reduction internal fixation (ORIF) to check maintenance of reduction. The optimal timing for radiographs is debated, especially as patients often do not weightbear for the first two weeks. This study aimed to evaluate the frequency and impact of radiographic follow-up at two and six weeks, and whether early imaging influenced management. Methods A retrospective review of patients who had ankle ORIF between December 2020 and November 2023 was conducted. Data collected included patient demographics, weight-bearing status, Lauge-Hansen classification, surgeon level, and indication for two-week imaging. Results Out of 374 patients who underwent ORIF, 177 had two-week radiographs. Only 4/374 patients required revision surgery for loss of reduction, all identified within the two-week period with intra-operative concerns about fixation quality. Among the 173 patients with two-week imaging, 83 had further imaging at six weeks; early imaging did not alter management. In 77% of cases with early imaging, no indication was recorded. Early imaging was associated with more complex injuries, such as a higher incidence of posterior malleolus fractures, but not with the surgeon's level. Conclusion Two-week radiographs rarely changed management, and often no indication for early imaging was documented. Radiographs were frequently repeated at six weeks, wasting departmental resources. We recommend performing routine radiographs at six weeks, reserving two-week imaging for cases with intra-operative concerns about fracture fixation quality.
Arpita DEVASHETTY (Reading, United Kingdom), Noah KHAN, Dan BURNS, Daniel MARSLAND
13:35 - 13:55 #43154 - PWP12 Evaluation of Leg-foot Range of Motion. Which Measurement Method is Most Reliable?
Evaluation of Leg-foot Range of Motion. Which Measurement Method is Most Reliable?

Objective To evaluate the methods of measuring leg-foot movement in normal ankles and feet by comparing the results of clinical measurements with those of radiographic measurement and to determine the range of leg-foot movement considered normal. Methods Leg-foot movement was measured in 44 patients (60 feet) using a traditional goniometer, digital goniometer, inclinometer, smartphone application, in addition to radiographic measurement (considered gold standard). Maximum dorsiflexion was achieved by asking the patient to take a step forward with the contralateral foot and perform as much dorsiflexion as possible in the ankle studied without removing the heel from the ground. For maximum plantar flexion, the patient was asked to take a step back with the contralateral foot and make as much plantar flexion as possible without removing the studied forefoot from the ground. Results The values obtained in radiographic measurement were higher than those obtained with clinical measurement. When we compared only the results of clinical measurement, the traditional goniometer was inaccurate. According to the radiographic method, the mean leg-foot range of motion was 65.6 degrees. The mean maximum plantar flexion was 34.9 degrees, and the mean maximum dorsiflexion was 30.7 degrees. Conclusions The most appropriate method for the evaluation of leg-foot range of motion is the radiographic one. The traditional goniometer proved to be the most imprecise clinical method. The mean leg-foot range of motion in healthy young adults was 65 degrees.
Marco Tulio COSTA (Sao Paulo, Brazil), Javier Felipe Salinas TENEJIRA, Cesar Augusto Lima SILVA, Italo Epaminondas De Queiroz REGO, Marcelo Marcucci CHAKKOUR, Noé DE MARCHI NETO, Jordanna Maria Pereira BERGAMASCO
14:00

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
PWP4
14:00 - 14:20

Poster Walks presentations 4
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Johnny FRØKJÆR (consultant foot and ankle surgeon) (Odense, Denmark), Karan MALHOTRA (Consultant Orthopaedic Surgeon) (London, United Kingdom)
14:00 - 14:20 #42677 - PWK13 The K-toe trial: Fixed hammertoe correction with or without K-wire fixation? A multicentre randomized controlled trial.
The K-toe trial: Fixed hammertoe correction with or without K-wire fixation? A multicentre randomized controlled trial.

Many surgical correction techniques for the hammertoe are described. Proximal interphalangeal joint resection (PIJ) is one of these. Often temporary K-wire fixation is used. This K-wire leads to potential discomfort and complications. Scientific insight into the value of a K-wire is scarce. This multicenter RCT evaluates the results of PIJ resection with- and without K-wire fixation. Primary aim was to test if both treatment options, in terms of the AOFAS lesser toe metatarsophalangeal scale (AOFAS) one year postoperatively, were comparable. Secondary, complications and reoperations were compared and improvement considering pain, function, alignment and patient satisfaction were investigated. Adults with a single hammertoe as a solitary foot problem were eligible for inclusion. Exclusion criteria were rheumatoid arthritis and insulin depending diabetes mellitus. A standardized surgical technique was used and randomization took place during surgery. Six weeks and one year post surgery the AOFAS, Foot Function Index and VAS satisfaction were asked. Twenty-one patients were randomized for PJI with and 25 for PJI without K-wire. Median difference on AOFAS score one year follow up fell within the non-inferiority margin. However, 95% CI intervals crossed both the non-inferiority and zero margin. Four complications in the K-wire group and 2 in the no K-wire group complications occurred, reoperations were equal. Both groups showed significant improvement looking to pain, function, alignment and satisfaction. The difference between the procedures is not significant but the result regarding non-inferiority is inconclusive. Because both options showed significant improvement in the other outcomes, both can be discussed with the patients.
Mathijs FUCHS (Eindhoven, The Netherlands), Marieke VAN DER STEEN, Marijn VAN DEN BESSELAAR, Martijn DIETVORST, Bart VAN GRONINGEN, Walter VAN DER WEEGEN, Dirk DAS, Hans HENDRIKS
14:00 - 14:20 #42955 - PWK14 A prospective observational study of Distal Metatarsal Minimally invasive osteotomy (DMMO) for the treatment of metatarsalgia.
A prospective observational study of Distal Metatarsal Minimally invasive osteotomy (DMMO) for the treatment of metatarsalgia.

Metatarsalgia, characterized by pain and inflammation in the ball of the foot, is often caused by biomechanical abnormalities, overuse, or certain medical conditions. Treatment options range from conservative approaches like orthotics and physical therapy to surgical interventions. Distal Metatarsal Minimally Invasive Osteotomy (DMMO) has gained popularity due to its minimal invasiveness, reduced recovery time, and fewer complications compared to traditional open surgical methods. This study aims to evaluate patient-reported and clinical outcomes of DMMO. A prospective observational study was conducted on 42 patients undergoing DMMO for metatarsalgia from April 2022 to February 2024. The American Orthopaedic Foot & Ankle Society (AOFAS) questionnaire was used to assess the lateral metatarsophalangeal joints pre-operatively and post-operatively at 2 weeks, 6 weeks, 3 months, 6 months, and 1 year. Data were analyzed using repeated measures ANOVA, mixed effect models with the Geisser-Greenhouse correction, and paired t-tests. The study included 42 patients with a mean age of 61 years (range: 35-75). The total mean AOFAS score showed a significant improvement of 82% at 1 year postoperatively compared to preoperative scores (p < 0.05). Significant improvements were observed in pain (76%), functional restriction (69%), footwear modification (44%), metatarsophalangeal joint mobility (63%), interphalangeal joint mobility (31%), callus formation (278%), and alignment (81%). Joint stability did not significantly improve. (13%, p=0.16) DMMO is an effective surgical technique for treating metatarsalgia, providing significant pain relief and functional improvement. The improvement in AOFAS scores underscores its value in managing metatarsalgia. Further long-term studies are recommended to confirm these findings.
Vansh KAPILA (Brugge, Belgium), Laura LOOMANS, Patrick DEMEY, Farhad TAJDAR, Patrick DEPREZ
14:00 - 14:20 #42968 - PWK15 Significance of Dorsal aspect evaluation in Hallux Rigidus: Insights through Distance and Coverage Mapping in Weight Bearing CT scan.
Significance of Dorsal aspect evaluation in Hallux Rigidus: Insights through Distance and Coverage Mapping in Weight Bearing CT scan.

INTRODUCTION Hallux rigidus (HR) is a painful condition with physiopathology poorly understood. Recently, weight-bearing computed tomography (WBCT), has demonstrated the capability to provide detailed joint evaluation through Coverage Mapping (CM) and Distance Mapping (DM). This study aimed to assess HR through 3D evaluation across its stages. METHODS Thirty-one HR patients with WBCT scans were analyzed retrospectively. The WBCT scans were segmented to create 3D bone models. The 1st MTP joint was divided into four quadrants (dorsal medial, dorsal lateral, plantar medial, plantar lateral). Differences in DM and CM were assessed statistically using One-Way ANOVA between quadrants. P values <0.05 indicated significance. RESULTS Regarding CM, no significant difference was found across all Coughlin and Shurnas Classification (CSC) stages. However, significant differences were found between the plantar and dorsal aspects (p <.0001). DM showed progressive joint space narrowing with worsening CSC stage, however, this trend was not statistically significant. Nonetheless, the dorsal aspect consistently showed joint space narrowing compared to the plantar aspect across all CSC stages, particularly the dorsal lateral aspect. DISCUSSION AND CONCLUSION Differences between the dorsal and plantar aspects of the 1st MTP joint were observed in both CM and DM. A decrease in the dorsal aspect in CM may suggest Metatarsus Primus elevates, linked to HR pathophysiology. No significant global joint space narrowing was observed among all CSC stages using DM. However, dorsal joint space narrowing was consistently most pronounced across all stages. Thus, focusing on the dorsal aspect in HR cases could provide more pathology insights.
Erik HUANUCO CASAS, Antoine ACKER (Geneva, Switzerland), Chien-Shun WANG, Emily LUO, Tommaso FORIN VALVECCHI, Grayson TALASKI, Andrew BEHRENS, Jeffrey LILES, Andrew HANSELMAN, Cesar DE CESAR NETTO
14:00 - 14:20 #43077 - PWK16 A game changing tool in the assessment of hypermobility of the first ray: a reliability study.
A game changing tool in the assessment of hypermobility of the first ray: a reliability study.

Background: First ray instability is responsible for several foot disorders. The treatment strategy is based upon the surgeon’s experience and manual sensitivity to quantify first ray hypermobility. We present a novel electromechanical tool measuring the relative dorsal mobility of the first ray (FRRM) compared to that of the lateral rays, by simulating ground reaction forces during gait. The aim of the study is to assess the intra- and inter-examiners reliability of measurements. Methods: 2 examiners assessed 22 feet of 11 healty volunteers. An automated adjustment of the position of the two bearings supporting M1 and M2 to M5 is performed by optical sensors. The device equally applies a standardized, electronically controlled force (from 0 up to 100N) under the two bearings. The FRRM is then measured as a function of the applied force. 15 measurements were performed on each foot (3 sets of 5 trials). The interclass correlation coefficient (ICC), the error of measurement (SEM) and the Bland and Altman (B&A) graphical analysis were computed. Results: Excellent ICC values (≥0.93) were obtained for inter-rater (ICC = 0.96, IC95 [0.90-0.98]) and intra-rater reliability (ICC= 0.96, IC95 [0.91-0.99]). The mean FRRM values are 5.89±2.34 (mm). The B&A analysis presented a bias between examiners of only −0.12 mm ranging from −0.54 to 0.29 mm. Conclusion: This study demonstrates that this device reliably measures the relative dorsal mobility of the first ray compared to the lateral rays, proving that it is a reliable tool for more scientifically defining the hypermobility of the first ray.
Filippo PIEROBON (Geneva, Switzerland), Quentin PRAZ, Spyridon SCHOINAS, Elisabeth SCHAUER, Laura PEURIERE, Victor DUBOIS-FERRIÈRE, Mathieu ASSAL
14:30

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
FP1
14:30 - 16:30

FREE PAPERS 1: Ankle & Sports

Moderators: Henryk LISZKA (senior assistant) (Krakow, Poland), Xavier OLIVA MARTIN (Barcelona, Spain)
14:30 - 14:36 #42647 - OP01 The role of deltoid and interosseous tibiofibular syndesmosis ligaments in stability after ankle fractures: a cadaveric study.
The role of deltoid and interosseous tibiofibular syndesmosis ligaments in stability after ankle fractures: a cadaveric study.

Background: Isolated fibula Weber B/Supination-External Rotation (SER) stage 4 fractures, with deltoid ligament rupture, are considered unstable. However, assessment of stability remains controversial. We conducted a cadaveric study to define the effect of damage of the superficial and deep deltoid ligament, and the distal tibiofibular syndesmosis on ankle stability. The pathologies represented were associated with SER type ankle fractures. Methods: Eight fresh frozen lower leg cadaveric specimens were tested: a) with manipulation (external rotation applied force) and b) using an axial loading machine with a force of 750N, after lesions were induced. The stages of dissection included: 1) Trans-syndesmotic fibula osteotomy and anterior inferior tibiofibular ligament (AiTFL), 2) posterior inferior tibiofibular ligament (PiTFL), 3) superficial deltoid (SDL), 4) deep deltoid (DDL) and 5) interosseous tibiofibular ligament (IoTFL). Clinical photographs and videos were recorded and Computerised Tomography (CT) imaging was obtained in all stages. Results: Findings were consistent in all cadavers. Specimens were stable when loaded after sectioned lateral column, PiTFL and superficial deltoid ligament (stages 1-3), with no medial clear space (MCS) opening on CT images. Additional dissection of deep deltoid ligament revealed talar shift, with widening of MCS on CT. Lastly, sectioning of the interosseous tibiofibular ligament resulted in subluxation of the ankle indicating severe instability. Conclusion: In isolated trans-syndesmotic fibula fractures SDL injury did not result in detectable instability. These fractures become unstable when DDL was sectioned and grossly unstable when IoL was torn. Thus, complete syndesmosis disruption needs to be considered in the management of these injuries.
Vasileios LAMPRIDIS (UK, United Kingdom), Nikolaos GOUGOULIAS, Panagiotis CHRISTIDIS, Vasileios RAOULIS, Evangelos ALEXIOU, Alexis KERMANIDIS, Aristidis ZIBIS
14:36 - 14:42 #42588 - OP02 Total ankle arthroplasty as a correction tool for foot deformities: analyzing the impact on medial column alignment through weight-bearing computed tomography and three-dimensional modeling.
Total ankle arthroplasty as a correction tool for foot deformities: analyzing the impact on medial column alignment through weight-bearing computed tomography and three-dimensional modeling.

Background: While weight-bearing computed tomography (WBCT) has been crucial in analyzing total ankle arthroplasty (TAA) positioning, its specific impact on the foot's medial column alignment is under-researched. Advances in image analysis software, enabling semi-automatic segmentation, 3D modeling, and semi-automatic angle measurements, have enhanced foot and ankle assessments' accuracy and reliability. This study aims to compare preoperative and postoperative alignments of the foot's medial column to evaluate TAA's corrective capabilities in this area and determine the reliability of these measurements. Materials and Methods: The study included 42 patients who underwent isolated TAA, with both preoperative and postoperative WBCT scans. Two raters measured eight angles related to the longitudinal arch's sagittal angle, forefoot abduction/adduction, intermetatarsal angles, and tarsometatarsal angles across two sessions to assess TAA's corrective impact on the medial column. Results: Statistically significant improvements were found in the longitudinal arch's sagittal angle, forefoot abduction/adduction angles, and sagittal tarsometatarsal angle postoperatively. The intermetatarsal and axial tarsometatarsal angles showed no significant change. Interclass correlation reliability analysis revealed good to excellent interobserver and intraobserver reliability. Conclusion: The use of WBCT, combined with semi-automatic analysis, shows significant potential for isolated TAA to correct deformities within the foot's medial column. The high reliability of these semi-automatic measurements suggests that WBCT, integrated with image analysis software assessing the entire lower limb, could enhance preoperative planning for TAA positioning. This approach ensures accurate ankle alignment and aids in planning additional hindfoot and forefoot realignment surgeries, potentially improving surgical outcomes and extending TAA's longevity
Efrima BEN, Agustin BARBERO (Milan, Italy), Amit BENADY, Cristian INDINO, Camilla MACCARIO, Federico USUELLI
14:42 - 14:48 #42716 - OP03 10 yrs follow-up of OCL of the talus, treated with autologous membrane-induced chondrogenesis (AMIC).
10 yrs follow-up of OCL of the talus, treated with autologous membrane-induced chondrogenesis (AMIC).

Background: This study investigates the long-term effect of an I/III collagen bilayer matrix (AMIC) in treating osteochondral lesions (OCL) of the talus. Methods: The 10-year results of a prospective, single-center cohort study are presented. All patients underwent an open AMIC procedure without malleolar osteotomy for OCL. Data analysis included demographics, MRI, intraoperative details, EFAS-, AOFAS Hindfoot Score, and Foot-Function-Index (FFI-D) pre-, one-, five-, and ten years following surgery. The primary outcome variable was the longitudinal effect of the procedure. Results: 21 (45%) out of 47 patients treated from 2010 to 2012 met the inclusion criteria (8 (38%) female, 13 (62%) male patients with a mean age of 37±15 years (15-62 years) and a BMI of 26±5 kg/m² (20-38 kg/m²). The defect size was 1.4 cm²±0.9 cm² (0.2-4.0 cm²). The defect location was medial in 76%, central in 10%, and lateral in 14%. 95% of the patients received additional procedures. The FFI-D decreased significantly from pre- to one-year post-operative (56±18 vs. 33±25; p=0.003), with a further, non-significant decrease between the one-, five-, and ten-year follow-up (33±25 vs. 24±21 vs. 15±12; p=0.457). Similar results were found for the other scores. The FFI subscale of sports activity did not significantly change compared to the preoperative situation with limitations, especially in running and jumping. Age, BMI, and lesion size significantly correlated to the FFI and its subscales. Conclusion: PROMS after AMIC are stable for at least 10 years. The detailed analysis of the FFI and EFAS Score showed constant limitations in sports activities.
Markus WALTHER (München, Germany), Lukas DEISS, Anke RÖSER, Oliver GOTTSCHALK
14:48 - 14:54 #42753 - OP04 Open reduction of the posterior malleolus: Do we need additional syndesmotic stabilization? A biomechanical study.
Open reduction of the posterior malleolus: Do we need additional syndesmotic stabilization? A biomechanical study.

The treatment of ankle fractures involving the posterior malleolus (PM) has changed in favor of open reduction and internal fixation (ORIF). The need for additional syndesmotic stabilization has decreased. However, there are still doubts about the diagnosis and treatment of residual syndesmosis instability. The aim was to evaluate the effect of fixation of the PM and to assess the need for additional stabilization methods. It was hypothesized that ORIF of the PM would not sufficiently stabilize the syndesmosis, but that additional syndesmotic reconstruction would restore kinematics. Eight unpaired fresh-frozen lower legs were tested in a six-degree-of-freedom robotic arm with constant loading (200N) in neutral position, 10° dorsiflexion, 15° plantarflexion and 30° plantarflexion. The specimens were evaluated in the following order: intact state; osteotomy of the PM; transection of the anterior inferior tibiofibular ligament (AITFL) and interosseous tibiofibular ligament (IOL); ORIF of PM; additional syndesmotic screw; combination of syndesmotic screw and AITFL augmentation; AITFL augmentation. A complete simulated rupture of the syndesmosis caused a translational (6.9mm posterior and 1.8mm medial displacement) and rotational instability (5.5° external rotation) of the distal fibula. This could be restored with ORIF of the PM in neutral ankle position, whereas sagittal and rotational instability remained in dorsi- and plantarflexion. In complex ankle fractures, ORIF of the PM is essential to restore syndesmotic stability. However, residual syndesmotic instability can be detected by a specific posterior shift of the fibula on stress testing. In these cases, an anatomical AITFL augmentation is biomechanically equivalent to a syndesmotic screw.
Alexander MILSTREY (Muenster, Germany), Stella GARTUNG, Jens WERMERS, Matthias KLIMEK, Michael RASCHKE, Sabine OCHMAN
14:54 - 15:00 #42917 - OP05 Deep posterior tibiotalar ligament in unstable Weber B ankle fractures: Cross-sectional study correlating arthroscopic and stress radiographic findings.
Deep posterior tibiotalar ligament in unstable Weber B ankle fractures: Cross-sectional study correlating arthroscopic and stress radiographic findings.

Background Weber B fractures often show unstable gravity stress tests but stable weightbearing radiographs (classified SER4a), suggesting partial deltoid ligament injury with an intact deep posterior tibiotalar ligament (dPTTL). Conversely, a dPTTL rupture is assumed if both radiographs are unstable (classified SER4b). However, the state of the dPTTL in SER4a vs. SER4b has yet to be studied. This study assessed the prevalence of dPTTL injury using direct visualization during arthroscopy of SER4a and SER4b fractures. Methods We conducted a prospective study on 20 adult patients with Weber B/SER4a-b ankle fractures having unstable gravity stress tests or unstable weightbearing radiographs (medial clear space 4.0 millimeters or larger). Blinded assessors evaluated the dPTTL using minimally invasive arthroscopy under local anesthesia. Intact dPTTL was defined by normal ligament visualization with tensioning and medial joint space closing with ankle dorsiflexion. Results Based on radiographic criteria, 15 patients were classified as SER4a and five as SER4b. Arthroscopy showed an intact dPTTL in 14 out of 15 SER4a injuries. In one SER4a patient, arthroscopy revealed dPTTL disruption despite a weightbearing radiograph with 3.9 millimeters of medial clear space. All SER4b injuries revealed dPTTL disruptions with arthroscopic assessment. Conclusions In Weber B fractures evaluated arthroscopically, the dPTTL is typically intact in cases where weightbearing radiographs are stable despite unstable gravity stress tests. Conversely, complete dPTTL disruption was consistently observed in cases where both tests were unstable. These findings support the hypothesis that a stable weightbearing radiograph indicates an intact dPTTL.
Martin GREGERSEN (Sarpsborg, Norway), Fredrik NILSEN, Mikaela HAMRE, Marius MOLUND
15:00 - 15:30 Discussion (1-5).
15:30 - 15:36 #43084 - OP06 Advantages of ultrasound identification of the distal insertion of the calcaneaofibular ligament during ligament reconstruction.
Advantages of ultrasound identification of the distal insertion of the calcaneaofibular ligament during ligament reconstruction.

Introduction: In lateral ankle instability, anatomical ligament reconstructions are generally performed using arthroscopy. The graft reconstructs the anterior talofibular and calcaneofibular (CFL) bundles. As the CFL calcaneal insertion is extra-articular, it makes it difficult to locate. Some techniques use radiography or surface anatomy. However, they can only offer an approximate identification of the actual CFL footprint, and they do not protect the sural nerve (SN). In contrast, an ultrasound technique allows direct visualisation of the insertion point and, of the sural nerve. Our study aimed to assess the reliability, accuracy and safety of ultrasound visualisation while performing calcaneal insertion of the CFL. Materials and methods: This anatomical study was carried out on 15 ankles. Ultrasound identification and dye injection of the sural nerve were performed. Then, a needle was positioned at the level of the CFL calcaneal insertion. After dissection, the dye was found in contact with the SN and, the needle, in the CFL calcaneal insertion area, in every ankle The mean distance between the SN and the needle was 4.8 mm (range 3-7 mm). Discussion and conclusion: A pre- or intra-operative ultrasound technique is a simple and reliable procedure to locate the CFL calcaneal footprint and drill the tunnel in a lateral ligament reconstruction safely. The tunnel should preferably be performed obliquely from the heel towards the subtalar joint (1 h-3 h direction on an ultrasound cross section), which preserves a maximum distance from the sural nerve, while allowing an accurate anatomical positioning of the calcaneal tunnel.
Julien BELDAME, Christel CHARPAIL (Bordeaux), Matthieu LALEVÉE, Riccardo SACCO, Fabrice DUPARC
15:36 - 15:42 #43141 - OP07 Three-Dimensional Mapping of Chaput Tubercle Fractures: Evaluation of Morphologic Characteristics and Anterior Inferior Tibiofibular Ligament Involvement.
Three-Dimensional Mapping of Chaput Tubercle Fractures: Evaluation of Morphologic Characteristics and Anterior Inferior Tibiofibular Ligament Involvement.

Introduction: The literature on the classification and optimal management of Chaput fractures is evolving. Hence, we performed a CT-based 3D fracture mapping study to identify these fractures' morphological characteristics. Methods: This study included adult patients who had an ankle fracture with a Chaput component. CT scans were obtained, 3D models were generated and superimposed over a statistical shape model of the right tibia, and fracture lines were marked. The footprints of proximal and main bands of the AITFL and Basset’s ligament were also marked on the template tibia. An automated script was used to determine the fragment size, fracture surface area, and involvement of the tibial plafond, tibial incisura, AITFL, and Basset’s ligament. Results: 76 patients, 21 males and 55 females were included in this study. Cluster analysis identified two distinct groups of fractures, each with two unique subgroups. We present this as a modification of the existing classification system. The first group consisted of sub-centimetric extra-articular avulsion fractures, n=47. Of these, 19% (n=9) did not involve the AITFL, which we termed as Type 1a, and 91% (n=48) involved the AITFL, which we termed Type 1b. The second group consisted of large intra-articular fractures. Of these 23% (n=6) involved only the incisura, which we termed as Type 2a; 77 % involved both the incisura and the tibial plafond and were termed as Type 2b. Conclusion: We propose a modification of the existing classification of Chaput fractures based on quantitative fracture mapping which may prove beneficial in surgical decision making.
Siddhartha SHARMA, Matthias PEIFFER, Bedri KARAISMAILOGLU (Istanbul, Turkey), Noopur RANGANATHAN, Soheil ASHKANI-ESFAHANI, Emmanuel AUDENAERT, Christopher DIGIOVANNI, Gregory WARYASZ
15:42 - 15:48 #42527 - OP08 A Step-by-Step Examination of Ankle Impingement Syndrome: An Evaluation of the Effectiveness and Quality of YouTube Videos.
A Step-by-Step Examination of Ankle Impingement Syndrome: An Evaluation of the Effectiveness and Quality of YouTube Videos.

Abstract Introduction YouTube is frequently used by patients and physicians for information. To our knowledge, there is no study evaluating the quality of YouTube videos in ankle impingement syndrome (AIS). The aim of this study was to evaluate and compare the quality of YouTube videos in anterior and posterior AIS. Methods YouTube videos on anterior and posterior AIS were evaluated and compared by two European Foot and Ankle Society (EFAS) member orthopedic surgeons using The Journal of American Medical Association (JAMA), DISCERN (Quality Criteria for Consumer Health Information), Global Quality Score (GQS) and Ankle Impingement Syndrome Specific Score (AISSS). Results 50 videos about anterior ankle impingement syndrome and 43 videos about posterior ankle impingement syndrome were evaluated. The mean duration of videos related to anterior ankle impingement syndrome was 354.70 seconds (± 314.28) and the mean number of views was 27,166.08 (± 54,898.69). The mean duration of videos related to posterior ankle impingement syndrome was 1594 seconds (± 424.94) and the mean number of views was 15,309.89 (± 47,916.02). When evaluating the quality of video content using scoring systems, videos related to anterior AIS have higher average JAMA, GQS, and DISCERN scores than those related to posterior AIS. However, this difference is only statistically significant for the DISCERN score (p= 0.045). Conclusions The quality of YouTube videos in anterior and posterior ankle impingement syndrome is not sufficient.
Semih YAŞ (Sarıkaya, Turkey), Mehmet Ali TOKGÖZ, Secdegül COSKUN YAŞ, Ahmet YILDIRIM, Tayfun ÖZEL
15:48 - 15:54 #43028 - OP09 The peroneal artery in anterolateral approach to the distal tibia: an anatomic study.
The peroneal artery in anterolateral approach to the distal tibia: an anatomic study.

The anterolateral approach to the distal tibia, used in lateral supramalleolar osteotomies, fibula osteotomies or pilon fractures, provides extensive exposure of the distal tibia and fibula. To avoid bleeding, care must be taken with the peroneal artery and its perforating branches (PBPA) that emerge through the interosseous membrane. Scarce literature is available describing its distribution. The objective of this study is to provide anatomical description of the PBPA at the anterolateral approach to the distal tibia and to determine safe zones. Fourteen fresh-frozen lower extremities were injected with red-colored latex at the popliteal artery. The mean age was 84.2 years-old (SD:75.8-92.6), and 8/14 were females. An anterolateral approach was performed systematically with careful dissection to identify all PBPA. The number of branches and its distance to the tip of the lateral malleolus were recorded. Thirteen (92.8%) of the specimens had three branches or fewer, ranging from 6.2-12.8cm to the tip of the lateral malleolus. Three areas were considered based on the risk of PBPA injury: “high risk” between 9.6-10.6 cm, where 10/14 specimens (71.4%) had a branch; “low risk” between 11.4-12.6 cm, with only 1/14 specimens (7.2%) presenting a branch; and “no risk” in three ranges (<6.2cm, 7.3-8.5 cm, and >12.8cm), where no branches were found in any of the specimens. According to our anatomical study, the area located 9.6-10.6cm from the tip of the lateral malleolus should be avoided when performing osteotomies and placing retractors while the regions of <6.2 cm, 7.3-8.5cm, <12.8cm present no risk of vascular injury.
Jan MARTINEZ-LOZANO (Barcelona, Spain), Tiago MOTA GOMES, Alberto GINÉS-CESPEDOSA, Xavier MARTIN OLIVA
15:54 - 16:00 #43138 - OP10 Evaluating fibular station changes with leg rotation in lateral ankle radiographs: a cross-sectional analysis.
Evaluating fibular station changes with leg rotation in lateral ankle radiographs: a cross-sectional analysis.

Introduction Syndesmotic reduction and instability are typically assessed using anteroposterior (AP) radiographs. These assessments are influenced by foot rotation, but little is known about their accuracy in the lateral view. This study hypothesizes that fibular station in the sagittal plane changes significantly with leg rotation. Methodology This cross-sectional, retrospective study analyzed digital lateral ankle X-ray images from CT scans of 15 ankles. Images were imported into 3D modeling software (3D Slicer), where neutral position and varying degrees of internal and external rotation were digitally reconstructed. Anterior and posterior fibular stations were measured across these rotations, yielding a total of 135 measurements. Correlations between fibular station and leg rotation were assessed using Pearson correlation coefficients and linear regression. Results Of the 15 CT scans, 13 were from male patients and 2 from female patients. The anterior fibular (AF) station showed a decreasing trend with internal rotation and an increasing trend with external rotation. The posterior fibular (PF) station exhibited the opposite trend. Anterior fibular ratios (AF/TW and AF/PW) decreased with internal rotation and increased with external rotation. Posterior fibular ratios (PF/TW and PF/PW) showed no significant changes with rotation. The correlation coefficients for AF and PF stations with rotation were -0.28 (p=0.001) and 0.19 (p=0.03), respectively. Conclusion Leg rotation significantly affects lateral fibular station parameters, necessitating neutral leg positioning for accurate syndesmosis reduction assessment. Posterior ratios, being less impacted by rotation, may serve as more reliable indicators. Accurate standardization of leg rotation during radiographic assessment is crucial for reliable measurements.
Kamal BENIWAL, Ankit DADRA (CHANDIGARH, India), Sandeep PATEL, Siddhartha SHARMA, Mandeep DHILLON, Mahesh PRAKASH
16:00 - 16:30 Discussion (6-10).
AUDITORIUM

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
FP2
14:30 - 16:30

FREE PAPERS 2: Ankle & Miscellanea

Moderators: Jan Willem LOUWERENS (orthopaedic surgeon) (Nijmegen, The Netherlands), Yves TOURNÉ (Chirurgien) (Grenoble, France)
14:30 - 14:36 #43098 - OP11 Development and validation of a fully automated tool to quantify 3D foot and ankle alignment using weight-bearing CT.
Development and validation of a fully automated tool to quantify 3D foot and ankle alignment using weight-bearing CT.

Introduction Foot and ankle alignment plays a pivotal role in human gait and posture. Traditional assessment methods, relying on 2D standing radiographs, present limitations in capturing the dynamic 3D nature of foot alignment during weight-bearing and are prone to observer error. This study aims to integrate weight-bearing CT (WBCT) imaging and advanced deep learning (DL) techniques to automate and enhance quantification of the 3D foot and ankle alignment. Methods Thirty-two patients who underwent a WBCT of the foot and ankle were retrospectively included. After training and validation of a 3D nnU-Net model on 45 cases to automate the segmentation into bony models, 35 clinically relevant 3D measurements were automatically computed using a custom-made tool. Automated measurements were assessed for accuracy against manual measurements, while the latter were analyzed for inter-observer reliability. Results DL-segmentation results showed a mean dice coefficient of 0.95 and mean Hausdorff distance of 1.41 mm. A good to excellent reliability and mean prediction error of under 2 degrees was found for all angles except the talonavicular coverage angle and distal metatarsal articular angle. Conclusion In summary, this study introduces a fully automated framework for quantifying foot and ankle alignment, showcasing reliability comparable to current clinical practice measurements. This operator-friendly and time-efficient tool holds promise for implementation in clinical settings, benefiting both radiologists and surgeons. Future studies are encouraged to assess the tool's impact on streamlining image assessment workflows in a clinical environment.
Ide VAN DEN BORRE, Matthias PEIFFER (Ghent, Belgium), Jean VERVELGHE, Manu HUYGHE, Roel HUYSENTRUYT, Aleksandra PIZURICA, Emmanuel AUDENAERT, Arne BURSSENS
14:36 - 14:42 #43134 - OP12 Anterior tibial tendon transfer in idiopathic clubfoot: does the outcome differ with the initial treatment? Proposed classification to surgical indication.
Anterior tibial tendon transfer in idiopathic clubfoot: does the outcome differ with the initial treatment? Proposed classification to surgical indication.

Purpose To establish parameters and propose a radiographic classification for foota dduction/supination deformities to assist the indication of Garceau procedure. Secondly, to investigate whether the outcome of Garceau surgery depends on the initial treatment used, peritalar release, or the Ponseti method, and verify the maintenance of correction until skeletal maturity. Methods Prospective cohort study, with follow-up evaluations in 2009 and 2019. Fifty-three consecutive patients (71 feet) with idiopathic congenital clubfoot were divided into two groups according to the initial treatment used: peritalar release (group I) or Ponseti method (group II). All patients underwent Garceau procedure. The patients were evaluated clinically and radiographically using the American Orthopedic Foot Association (AOFAS) score for ankle and hindfoot. Results In the first clinical evaluation, the mean score on the AOFAS was 87 points in group I and 86 points in group II. In the second evaluation, group I had mean AOFAS of 92 points and group II of 94 points. No statistical differences were found between the two groups. In the radiographic evaluation, the adduction deformity obtained an average correction of 4° in group I and 3.6° in group II; in supination deformity, the average depression of the first metatarsal head in relation to the ground was 6.7 mm in group I and 7.5 mm in group II, indicating the correction was maintained until skeletal maturity. Conclusion Garceau transfer is capable of correcting residual deformities in adduction/supination of mild and moderate degrees, regardless of the initial treatment, and maintaining the correction until skeletal maturity.
Jordanna BERGAMASCO, Jordanna BERGAMASCO (São Paulo, Brazil), Marco Tulio COSTA, Ricardo FERREIRA, Patricia Maria FUCS
14:42 - 14:48 #42914 - OP13 Supramalleolar Osteotomy for ankle arthritis; Single Tertiary Referral Centre 12 year Overview comparing standard and custom Implant.
Supramalleolar Osteotomy for ankle arthritis; Single Tertiary Referral Centre 12 year Overview comparing standard and custom Implant.

The aim was to demonstrate that Supramalleolar osteotomy is a valuable treatment method in eccentric ankle arthritis in young and middle aged since it is an under-utilised procedure. We retrospectively analysed the outcome of it performed over 12 year period. We also compared the results of recently introduced computer-assisted PSI Integrated custom-made implants with standard implant. Data was analysed from 47 patients over a period of 12 years of which 40 were by standard implant and 7 by computer assisted custom implant. 29 varus, 18 valgus deformity. The mean age was 57 (26-79 y/o), male:female ratio was 27:19. Mean follow-up was 15.25 months for standard implants; For the computer-assisted procedures the follow up range is 24 to 2 months. TAS, TTS and TT angels were measured pre and post-operatively. Fixation using a plate with/without bone graft or custom-made implant was performed by a single surgeon. MOXFQ and AOFAS questionnaires were completed pre and post-operatively. All followed similar rehabilitation programme. Average radiological healing time was 24.3 weeks. MOXFQ score improved from 55.17 to 25.11 and AOFAS from 20.16 to 56.21. Complications were 2 non-unions, 1 stress fracture. 8 patients require fusion/replacement between 3-5 years. The PSI Integrated computer-assisted case gave improved accuracy than standard method with better scores but with a smoother approach for the surgeon. Our results are comparable to similar studies. Being a joint preserving technique, Supra Malleolar Osteotomy should be considered either as an interim or definitive procedure especially with the development of computer assisted technologies.
Seyed ALI (Sutton Coldfield, United Kingdom), Mubark ISLAM
14:48 - 14:54 #42962 - OP14 The Hounsfield Units Algorithm demonstrates changes in bone density of the distal tibia in patients with Talus Osteochondral Defect.
The Hounsfield Units Algorithm demonstrates changes in bone density of the distal tibia in patients with Talus Osteochondral Defect.

INTRODUCTION: Changes in bone density (BD), particularly sclerosis, around Osteochondral Defects (OCD) of the talus have been described. However, data on distal tibia BD near these defects are lacking. Weightbearing computed tomography (WBCT) quantifies BD using Hounsfield units (HU). This study aimed to analyze mechanical stress distribution in the distal tibia and talus through BD distribution using HU. METHODS: Retrospective comparative study including patients with talar OCD as primary diagnosis or incidental finding. In WBCT images, the VOI matched the OCD width and depth, extending 5mm below and 5mm above the tibial plafond. HU distribution was obtained along three perpendicular lines (anterior, central, posterior), dividing values into four segments: talus, osteochondral lesion, joint space, and tibia. The process was repeated on the opposite non-lesion side as a control. RESULTS: Thirty-two talar OCD patients were included. Fifty-two percent were symptomatic, and 48% with an incidental finding. There was not significant difference in mean HU between symptomatic and incidental OCD patients. In controls, the talus had higher HU average than the tibia, but in OCD patients the tibia demonstrated higher HU than the talus. When comparing the HU in the tibia between OCD and controls, the OCD patients demonstrated significantly increased BD (474.34 vs 382.32)(p<.0001). DISCUSSION AND CONCLUSION: Our results show significantly increased BD compared to controls, even among asymptomatic cases. This finding could potentially explain the pain symptoms, as well as the subsequent occurrence of mirror OCD in the tibia (kissing lesion). Future studies are necessary to further elucidate this issue.
Erik HUANUCO CASAS, Antoine ACKER (Geneva, Switzerland), Francois LINTZ, Kepler CARVALHO, Tommaso FORIN VALVECCHI, Emily LUO, Grayson TALASKI, Samuel ADAMS, Mark EASLEY, Cesar DE CESAR NETTO
14:54 - 15:00 #42831 - OP15 High body mass index is not a contraindication for an arthroscopic ligament repair with biological augmentation in case of chronic ankle instability.
High body mass index is not a contraindication for an arthroscopic ligament repair with biological augmentation in case of chronic ankle instability.

Purpose: To compare the clinical results of an arthroscopic lateral ligament repair with biological augmentation between patients with a BMI ≥ or < 30. Methods: Sixty-nine patients with an isolated lateral ankle instability were treated with an arthroscopic anterior talofibular ligament (ATFL) repair with biological augmentation using the inferior extensor retinaculum (IER). Patients were divided into two groups according to their BMI: ≥ 30 (Group A; n=26) and <30 (Group B; n=43). Patients were pre-and post-operatively evaluated, with a minimum of 2 years follow-up, using the Karlsson Score. Characteristics of the patients, complications, ankle instability symptoms recurrence, and satisfaction score were recorded. Results: In group A, median Karlsson Score increased from 43.5 (Range 22-72) to 85 (Range 37-100) at follow-up. Complications were observed in 7 patients (27%). Nineteen patients (73%) reported that they were “very satisfied”. In group B, median Karlsson Score increased from 65 (Range 42-80) to 95 (Range 50-100) at follow-up. Complications were observed in 4 patients (9%). Thirty-three patients (77%) reported that they were “very satisfied”. Pre-operative and at last follow-up Karlsson Score, results were significantly different between the two groups. There was no significant statistical difference in favour of satisfaction score, complications between the two groups. Conclusion: ATFL repair with biological augmentation using IER gives excellent results for patients with BMI ≥ 30. Compared to patients with BMI <30, they present a slightly lower preoperative and postoperative Karlsson score, however, with a similar satisfaction rate, but are at higher risk of transient superficial peroneal nerve dysesthesia.
Kevin GUIRAUD, Kevin GUIRAUD (Villeneuve-sur-Lot), Guillaume CORDIER, Jordi VEGA, Gustavo ARAUJO NUNES
15:00 - 15:30 Discussion.
15:30 - 15:36 #42773 - OP16 Comparative study of outcome measures of arthroscopic versus mini arthrotomy ankle fusion: Is there any difference?
Comparative study of outcome measures of arthroscopic versus mini arthrotomy ankle fusion: Is there any difference?

Background: Ankle fusion is the benchmark procedure in refractory cases of ankle arthritis. Aim: The aim of this work was to compare different outcome measures of arthroscopically assisted ankle fusion and mini-arthrotomy ankle fusions. Methods: This prospective study included 30 patients with post-traumatic ankle OA, who were treated by ankle fusion. Patients were divided regarding the adopted procedure into two groups, 15 patients in each group. Group A was treated using arthroscopic assisted ankle fusion and Group B using single incision mini arthrotomy ankle fusion. They were evaluated clinically with AFOAS, visual analogue scale of pain pre and post operatively, time of union, complications and satisfaction. Results: The results were satisfactory in 12 patients in group A and 11 patients in group B. While three patients (20%) in group A and four patients (26.6%) in group B had unsatisfactory results according to AFOAS and VAS. Sound solid ankle fusion was achieved in 13 (86.6%) ankles in group A with a mean fusion time of 14.4 weeks (range from 12-18 weeks) and 11 (73.3%) ankles in group B with a mean fusion time of 14.5 weeks. Two ankles in group A (13.3%) and four ankles in group B (26.6%) had non-union. Conclusion: No difference was found between single-incision mini-arthrotomy and arthroscopic assisted ankle fusion. Minimally invasive ankle arthrodesis (particularly arthroscopic assisted technique) offers a good option for the minimally deformed arthritic ankle.
Islam SARHAN (UK, United Kingdom), Mohamed NAGY, Saed SHEKEDF
15:36 - 15:42 #43097 - OP17 Articular Contact Mechanics in Osteochondral Lesions of the Talus: A Weightbearing-CT study.
Articular Contact Mechanics in Osteochondral Lesions of the Talus: A Weightbearing-CT study.

Introduction: Osteochondral Lesions of the Talus (OLT) may progress into a cascade of cartilage degeneration. While edge-loading on the surrounding tibiotalar articular surfaces has been proposed as principal determinant of cartilage degeneration, the pathophysiological pathways have not yet been clarified. The present study aims to evaluate the patient-specific influence of OLTs on the mechanical behaviour of the surrounding cartilage of the talus and tibia. Methods Patient-specific 3D models from 36 patients with an OLT, derived from weightbearing CT, were used to analyse the contact stress on the tibiotalar articulation using Discrete Element Analysis (DEA). A matched, virtual healthy control group was developed for each talus. Mean- , peak contact-stress and contact area were calculated during simulated ankle flexion. Results The mean talar contact-stress was elevated in the OLT cases, with a notable correlation between ankle flexion and OLT location. Edge loading occurred predominantly in anteromedial lesions during dorsiflexion (2.9 MPa (IQR: 1.3) for OLT versus 2.4 MPa (IQR: 0.9) for the controls), while posteromedial lesions were mostly loaded during plantarflexion (3.5 MPa (IQR: 1.7) for the OLT versus 2.9 MPa (IQR: 1.1) for the controls). Conclusion OLTs influence the whole-joint articular contact mechanics of the ankle, leading to increased stress on both the talus and the opposing tibia. More specifically, a clear pattern of edge-loading on the surrounding OLT cartilage was found. Anterior lesions had the highest stresses in neutral and dorsiflexion, while posterior lesions experienced higher stress during plantarflexion.
Matthias PEIFFER (Ghent, Belgium), Julian HOLLANDER, Arne BURSSENS, Sjoerd STUFKENS, Soheil ASHKANI-ESFAHANI, Emmanuel AUDENAERT, Gino KERKHOFFS, John KWON, Christopher DIGIOVANNI
15:42 - 15:48 #43089 - OP18 Sex Differences in Trace Element Zinc and Magnesium Levels After Fracture in a Rat Model.
Sex Differences in Trace Element Zinc and Magnesium Levels After Fracture in a Rat Model.

Introduction: Zinc and magnesium are crucial for bone health, with deficiencies potentially impairing bone metabolism and repair. This study is the first to examine sex-related differences in trace element levels during the initial stages of fracture healing. Understanding these differences may lead to more effective treatments or supplementation strategies. Methods: After inducing a closed mid-diaphyseal femur fracture in male and female BB Wistar rats, fractured and intact contralateral femurs were collected at 1-, 3-, and 7-days post-injury. 10 mm segments were resected from the center of the callus, and similar regions were taken from contralateral femurs. Control femurs were harvested from non-fractured rats. Samples were analyzed via inductively coupled mass spectrometry, and t-tests compared fractured femurs to control and contralateral femurs, with p-values adjusted for multiple comparisons. Results: Zinc levels were significantly lower at the fracture site for 1-, and 3-day male groups compared to controls (p<0.01). In females, zinc levels remained relatively stable across time points, with a notable non-significant decrease at the fracture site for the 7-day group. Magnesium levels were significantly lower at the fracture site for 1-day and 3-day male groups compared to controls (p<0.01). In females, magnesium levels showed minor fluctuations, with a slight non-significant decrease at the fracture site for the 7-day group. Conclusion: This study highlights sex differences in early fracture healing, with distinct temporal patterns in zinc and magnesium levels. These findings enhance our understanding of the roles of these trace elements in fracture healing and may inform future therapeutic approaches.
Jonathan LOPEZ (Newark, NJ, USA), David AHN, Mark FISHER, Jason DANIELS, James THORNTON, Darian NAPOLEON, Laura KUKLO, Ruey Horng CHEE, Sheldon LIN, J. Patrick O'CONNOR
15:48 - 15:54 #43107 - OP19 Midterm Outcomes of Transfibular Total Ankle Arthroplasty: Clinical and Radiographic Analysis of 130 Cases with Minimum 5-Year Follow-up.
Midterm Outcomes of Transfibular Total Ankle Arthroplasty: Clinical and Radiographic Analysis of 130 Cases with Minimum 5-Year Follow-up.

While most total ankle arthroplasty (TAA) utilize an anterior approach for implantation, the Zimmer Trabecular Metal implant is unique in that it utilizes a transfibular approach. This allows for a shallow resection depth and insertion of a curved prosthesis design, mimicking the native tibiotalar joint. We present the largest midterm study to date analyzing the survivorship, clinical, and radiographic outcomes of transfibular TAA at a minimum of 5-years follow-up. A total of 130 ankles (122 patients, average age 60.8 years-old, 50.8% females) with average 5.9 years (range, 5.0-10.1) follow-up were included. PROMs included SF-12 physical (PCS) and mental (MCS) component scores, Ankle Osteoarthritis Scale (OAS), pain Visual Analog Scale (VAS). Radiographic outcomes included ROM, coronal/sagittal alignment, and periprosthetic lucency using a 12-zone system. Adverse events were reported using the Canadian Orthopedic Foot and Ankle Society Reoperation Coding System (CROCS). Postoperative PROMs included SF-12 PCS: 41.5; SF-12 MCS: 54.9; VAS: 2.3; AOS Pain: 19.1; AOS Disability: 28.5. Postoperative tibiotalar ROM was 7.4° dorsiflexion, 17.3° plantarflexion. 26 (20%) ankles had a single zone of radiolucency; none had more than 7 zones. There were 3 (2.3%) cases of cysts, no cases of subsidence, septic/aseptic loosening, or fibular non-union. Reoperation rate was 36.2% (n=47) at average 26.7 months, most commonly removal of fibula hardware (n=28, 21.5%), medial gutter debridement (n=18, 13.8%). There were 5 (3.8%) cases of acute infection treated with I&D and metal component retention. Overall implant survival, defined by retention of the metal components, was 100% at final follow-up.
Jonathan DAY (Baltimore, USA), Amanda FLETCHER, Morgan MOTSAY, Maggie MANCHESTER, Zijun ZHANG, Lew SCHON
15:54 - 16:00 #43090 - OP20 Poetry in Motion: Ankle Biomechanics in Ballet Dance.
Poetry in Motion: Ankle Biomechanics in Ballet Dance.

Introduction/Purpose: Ankle sprains are one of the most common injuries amongst ballet dancers and may lead to chronic ankle instability. Certain ballet positions can further increase the risk of bone and soft tissue injuries. While injuries occur frequently, there is little understanding of the biomechanics of the foot/ankle in ballet. This study used weightbearing computed tomography (WBCT) and distance mapping to describe ankle joint mechanics in various ballet positions. Methods: Bilateral WBCT scans were taken of five healthy professional ballerinas in five different positions: control/neutral, first position, fifth position, plié, and relevé (en pointe). A semi-automatic software was used to segment models of all bones proximal to the first distal phalanx. Talar dome and gutter articulations were selected manually, and distances along the entire tibiofibular interface and gutter articulations were calculated. Results: Syndesmotic widening was greatest in first position at 5 cm above the tibiotalar joint (Mean: 9.39 mm). The relevé position consistently had the greatest syndesmotic narrowing. The anteromedial gutter had the largest range in regard to distance, with greatest joint space width in fifth position (Mean: 4.99 mm) and narrowest in plié (Mean: 2.68 mm). More specifically, in fifth position the anteromedial gutter space was 71% wider than the control position. Conclusion: This study is the first of its kind to mechanistically describe the ankle as it relates to ballet dancing. Future research with larger cohorts and more WBCT stress positions is needed to comprehensively understand the foot and ankle joint mechanics in this demanding sport.
Emily LUO (Durham, NC, USA), Katherine KUTZER, Kepler CARVALHO, Grayson TALASKI, Madeline UNGS, Zirbes CHRISTIAN, Erik HUANUCO CASAS, Antoine ACKER, Cesar DE CESAR NETTO
16:00 - 16:30 Discussion.
STUDIO
16:30

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
CB2
16:30 - 17:00

Coffee Break, Exhibition, and Poster Walks

17:00

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
DF1
17:00 - 18:25

DISCUSSION FORUM – Stress Fractures and Sport

17:00 - 18:25 Moderators. Mostafa BENYAHIA (Surgeon) (Moderator, Copenhagen, Denmark), James RITCHIE (orthopaedic Foot and Ankle Surgeon) (Moderator, Tunbridge Wells, United Kingdom)
17:00 - 17:10 General considerations and how to address. Ezequiel PALMANOVICH (ezepalm@gmail.com) (Speaker, Kfar Saba, Israel)
17:10 - 17:20 Any role for conservative treatment? Bruno PEREIRA (Surgeon) (Speaker, Braga, Portugal)
17:20 - 17:30 Second metatarsal. Paolo CECCARINI (Ortopaedic Surgeon) (Speaker, Perugia, Italy)
17:30 - 17:40 Calcaneus. Fabian KRAUSE (Head Foot & Ankle surgery) (Speaker, Berne, Switzerland)
17:40 - 17:50 Navicular stress fracture. Antonio VILADOT (orthopaedic Surgeon) (Speaker, Barcelona, Spain)
17:50 - 18:00 Fifth metatarsal. Henryk LISZKA (senior assistant) (Speaker, Krakow, Poland)
18:00 - 18:25 Discussion.
AUDITORIUM

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
DF2
17:00 - 18:25

DISCUSSION FORUM – Midfoot Trauma

17:00 - 18:25 Moderators. Daniele MARCOLLI (Foot and Ankle Surgeon) (Moderator, Milano, Italy), Fabian KRAUSE (Head Foot & Ankle surgery) (Moderator, Berne, Switzerland)
17:00 - 17:10 Navicular displaced fracture. Markus WALTHER (Medical Director) (Speaker, München, Germany)
17:10 - 17:20 Cuboid displaced (and comminuted) fracture. Antonio DALMAU (Head of Department) (Speaker, Barcelona, Spain)
17:20 - 17:30 The Jones fracture in the young athlete. Maneesh BHATIA (Virtual Film Festival videos) (Speaker, Leicester, United Kingdom)
17:30 - 17:40 The subtle Lisfranc. Mark Bowen DAVIES (Consultant Orthopaedic Surgeon) (Speaker, Sheffield, United Kingdom)
17:40 - 17:50 The not-so-subtle Lisfranc – fixation and how. Manuel SOUSA (Foot and Ankle Surgeon) (Speaker, Lisbon, Portugal)
17:50 - 18:00 The comminuted Lisfranc – primary arthrodesis and how. Joris HERMUS (Orthopedic surgeon) (Speaker, Maastricht, The Netherlands)
18:00 - 18:25 Discussion.
STUDIO
18:25

"Thursday 17 October"

Added to your list of favorites
Deleted from your list of favorites
WR
18:25 - 18:30

Adjourn and Welcome Reception

AUDITORIUM
Friday 18 October
08:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PL1
08:00 - 08:30

PRESIDENTIAL INVITED LECTURE

08:00 - 08:30 Moderator. Kristian BUEDTS (Md) (Moderator, Brussels, Belgium), Jente WAGEMANS (Speaker, Schoten, Belgium)
AUDITORIUM
08:40

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PS2
08:40 - 10:00

PLENARY SESSION 2:
TIBIAL MALALIGNEMENT AFFECTING THE FOOT AND ANKLE

08:40 - 10:00 Moderators. Markus WALTHER (Medical Director) (Moderator, München, Germany), Mark Bowen DAVIES (Consultant Orthopaedic Surgeon) (Moderator, Sheffield, United Kingdom)
08:40 - 08:50 Proximal tibia – varus or valgus knee. Aleksas MAKULAVICIUS (Team leader) (Speaker, Vilnius, Lithuania)
08:50 - 09:00 Diaphyseal / torsional deformities. Christian PLAASS (Consultant) (Speaker, Hannover, Germany)
09:00 - 09:10 Supramalleolar – varus/valgus. Victor VALDERRABANO (Chairman) (Speaker, Basel, Switzerland)
09:10 - 09:20 Supramalleolar – multiplanar and sagittal plane. Matthias WALCHER (Orthopaedic Surgeon) (Speaker, Würzburg, Germany)
09:20 - 09:30 Progressive correction with circular external fixation. Antti YLITALO
09:30 - 10:00 Discussion.
AUDITORIUM
10:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
CB3
10:00 - 10:30

Coffee Break, Exhibition and Poster Walks

10:05

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWP5
10:05 - 10:25

Poster Walks presentations 5
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Speakers: Stefan CLOCKAERTS (Foot and ankle Surgeon) (Speaker, Mechelen, Belgium), Antti YLITALO
10:05 - 10:25 #42587 - PKW17 Three-Dimensional Distance Mapping to Identify Safe Zones for Lateral Column Lengthening.
Three-Dimensional Distance Mapping to Identify Safe Zones for Lateral Column Lengthening.

Background: Evans (E-LCL) and Hintermann LCL (H-LCL) lateral column lengthening osteotomies are standard surgical solutions for flexible, progressive collapsing feet. E-LCL is performed between the anterior and middle facets, posing risks to certain os calcis subtalar joint (OCST) subtypes. H-LCL is performed between the posterior and middle facets, potentially suitable for all OCSTs. Both osteotomies can lead to increased subtalar osteoarthritis, suggesting iatrogenic damage. Distance mapping (DM) visualizes the relative distance between two articular surfaces using color patterns. This study aims to measure the safe zones for LCL using 3D models and DM, hypothesizing high reproducibility. Methods: Two raters categorized 200 feet across 134 patients into OCSTs based on the Bruckner classification. They independently measured four angles. The proximal and distal extents of the posterior safe zone (PSZ) angles were determined for H-LCL osteotomies, while the anterior safe zone (ASZ) angles were identified for E-LCL osteotomies. The surface area available for safe osteotomies was calculated. Interclass correlation assessed rater agreement, with analysis of variance and Mann-Whitney U tests comparing safe zones between OCSTs. Results: The mean proximal and distal extents of the PSZ angles were 68 ± 7 and 75 ± 5 degrees, respectively. The ASZ angles were 89 ± 6 and 95 ± 5 degrees, respectively. No significant differences were found between OCSTs. The raters showed good to excellent agreement. In 18 cases, planning for H-LCL or E-LCL osteotomies was not feasible
Efrima BEN, Agustin BARBERO (Milan, Italy), Kuharajan RAMALINGAM, Cristian INDINO, Camilla MACCARIO, Federico USUELLI
10:05 - 10:25 #42589 - PKW18 Abnormal axial rotation of the talus on weight-bearing computed tomography in patients with osteochondral lesion of the talus and functional instability of the ankle.
Abnormal axial rotation of the talus on weight-bearing computed tomography in patients with osteochondral lesion of the talus and functional instability of the ankle.

Introduction: Osteochondral lesions of the talus (OLT) are commonly associated with ankle sprains, often leading to chronic ankle instability (CAI), both mechanical and functional. While diagnosing mechanical CAI is straightforward, identifying functional CAI presents challenges. Microinstability, attributed to superior anterior talofibular ligament (S-ATFL) tear, is proposed as a factor in functional CAI, resulting in anterior translation and internal rotation of the talus. Weight-bearing computed tomography (WBCT) provides valuable insights into hindfoot alignment, particularly under load-induced deformation, making it a promising tool for evaluating patients with functional instability. This study aims to compare talus axial rotation in symptomatic OLT patients with subjective signs of functional CAI to asymptomatic volunteers and assesses the reliability of these measurements. Materials and Methods: Forty ankles with symptomatic OLT and micro-instability signs were compared to a control group of asymptomatic individuals. Three-dimensional models were generated using WBCT and image analysis software, allowing for semi-automatic hindfoot alignment measurements. Additional analysis was conducted to assess the agreement between measurements. Results: Symptomatic OLT patients displayed significantly increased external talus rotation compared to controls, with a mean difference of -4.5 ± 4.5 degrees (P < 0.001). Intraobserver reliability showed good to excellent correlation (ICC 0.88, ICC 0.92), while interobserver agreement was excellent (ICC 0.93, ICC 0.90). Conclusion: Patients with symptomatic OLT and functional CAI exhibit abnormal external rather than internal talus rotation. Preoperative WBCT reliably identifies abnormal external rotation, suggesting caution regarding procedures like lateral ligament surgeries that may exacerbate joint incongruence.
Efrima BEN, Agustin BARBERO (Milan, Italy), Cristian INDINO, Camilla MACCARIO, Amit BENADY, Federico USUELLI
10:05 - 10:25 #42627 - PKW19 Are large language models efficient as triage tools for surgical management of foot and ankle patients?
Are large language models efficient as triage tools for surgical management of foot and ankle patients?

Large Language Models (LLMs) like ChatGPT and Bard have emerged as potential but not risk-less tools, offering specialized answers based on context and prior knowledge. In Foot and Ankle (FA) surgery, efficient triage is crucial due to the variety of conditions and limited surgical time. This study evaluates LLMs' ability to guide patients towards appropriate medical or surgical management compared to board-certified FA surgeons. Forty-four fictitious clinical scenarios were created, incorporating chronicity, onset, and anatomic localization. Outcomes were assessed on a Likert scale (1-5) for the likelihood of needing surgical management, and the primary outcome was a binary decision towards surgical (1,2,3 for certain, probable or uncertain) or medical follow up (4,5 for improbable and not required). Four FA surgeons and ChatGPT and Bard were evaluated, with agreement analyzed using Fleiss' and Cohen's Kappas. Overall Likert scale agreement was -0.003, indicating no concordance. Agreement on the decision (surgical versus medical orientation of patients) improved to low (0.17). Pairwise comparison showed slight agreement among surgeons (0.02) and moderate between LLMs (0.52), with ChatGPT aligning slightly with surgeons (0.13), and Bard poorly (0.09). Strikingly, agreement between surgeons was even worse (0.067). LLMs require refinement for clinical reliability. Moderate agreement between them suggests a common knowledge base which could be promising regarding their reliability, although ChatGPT's higher surgeon agreement suggests some models may better capture clinical judgment nuances. Future research should enhance LLMs interpretive algorithms based on a common nomenclature of conditions and explore their supportive role in medical decision-making.
François LINTZ (Toulouse), Antoine ACKER, Kepler (Alencar Mendes) CARVALHO, May LABIDI, Gianluca GONZI, Marie-Aude MUNOZ, Alessio BERNASCONI, Cesar DE CESAR DE NETTO
10:05 - 10:25 #42987 - PKW20 Ankle fracture with well-repaired syndesmotic injury versus ankle fracture with no syndesmotic injury: a prospective cohort study of surgical outcomes.
Ankle fracture with well-repaired syndesmotic injury versus ankle fracture with no syndesmotic injury: a prospective cohort study of surgical outcomes.

Introduction This prospective cohort study was to compare treatment outcomes between ankle fractures with well-repaired syndesmotic injury and with no syndesmotic injury following standard fixations. Methods All 34 patients were divided into group-1: ankle fracture with well-repaired syndesmotic injury (n = 21) and group-2: ankle fracture with no syndesmotic injury (n = 13). In group-1, syndesmotic evaluations before/after syndesmotic repairs were done via hook tests/external rotation stress tests under fluoroscopic control and/or open syndesmotic viewing. Syndesmotic articulation was reduced and fixed/repaired to be close to anatomic alignment as possible under fine-tune confirmation as mentioned. Other fractures at ankle area were fixed as standard manners. Tibiofibular (TF) clear space was measured as a main parameter to determine quality of syndesmotic repair. Validated Visual analogue scale foot and ankle (VASFA) scores and Short Form-36 (SF-36) were postoperatively recorded. Results There were no significant differences between the two groups in terms of postoperative VASFA scores (group-1: mean-value = 82.26 +/- 17.20 vs group-2: mean-value = 74.53 +/- 22.16, P-value = 0.269) and quality of syndesmotic repair via postoperative TF clear space distances (group-1: mean-value = 3.84 +/- 1.78 mm vs group-2: mean-value = 3.84 +/- 1.06 mm, P-value = 1). VASFA moderately correlated with SF-36 scores via Pearson Correlation Coefficient (r): 0.5016. Conclusions Ankle fracture patients with well-repaired syndesmotic injury were able to demonstrate similar outcomes to a cohort with no syndesmotic injury following surgery. Syndesmotic injury did not always produce negative outcome provided that it was well repaired under proper treatment.
Angthong CHAYANIN (Bangkok, Thailand)
10:30

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
F2
10:30 - 11:30

Foot and Ankle Trauma FORUM

10:30 - 11:30 Moderators. Stefan RAMMELT (Head, Foot & Ankle Center) (Moderator, Dresden, Germany), Nikolaos GOUGOULIAS (Consultant Orthopaedic Surgeon) (Moderator, Katerini, Greece)
10:30 - 10:40 Operative versus non-operative treatment of ankle fractures – What do we know? Nikolaos GOUGOULIAS (Consultant Orthopaedic Surgeon) (Speaker, Katerini, Greece)
10:40 - 10:50 When and how to treat deltoid ligament ruptures in ankle fractures? Hans POLZER (Speaker, France), Sebastian BAUMBACH (Speaker, Germany)
10:50 - 11:00 When and how to treat anterior and posterior malleolar fractures? Andrzej BOSZCZYK (consultant) (Speaker, Warsaw, Poland)
11:00 - 11:10 What to do differently in patients with relevant comorbidities? Stefan RAMMELT (Head, Foot & Ankle Center) (Speaker, Dresden, Germany)
11:10 - 11:30 Discussion.
AUDITORIUM

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
EDI
10:30 - 11:30

EDI (Equality, Diversity, Inclusion) FORUM:

10:30 - 11:30 Moderators. Elena SAMAILA (Associated Professor) (Moderator, Verona, Italy), Rick BROWN (Clinical lead) (Moderator, Oxford, United Kingdom)
10:30 - 10:40 Ethnicity in Foot & Ankle surgery. Mostafa BENYAHIA (Surgeon) (Speaker, Copenhagen, Denmark)
10:40 - 10:50 LGTBQ+ in Foot & Ankle Surgery. Kristian BUEDTS (Md) (Speaker, Brussels, Belgium)
10:50 - 11:00 EDI in Orthopaedics in Eastern Europe. Iozefina BOTEZATU (MDPhD) (Speaker, bucharest, Romania)
11:00 - 11:10 “Briser le plafond de glace”- Breaking the glass ceiling. How can institutions make it easier for future women to progress in F&A surgery? Barbara PICLET (chirurgien) (Speaker, Marseille, France)
11:10 - 11:20 Establishing a mentorship Programme for Foot & Ankle Surgeons. Anna CHAPMAN (Speaker, United Kingdom)
11:20 - 11:30 Discussion.
STUDIO
11:30

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
GA
11:30 - 13:00

EFAS GENERAL ASSEMBLY

STUDIO
13:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
L2
13:00 - 15:00

Lunch, Exhibition, Industry Workshops & Poster Walks

EXHIBITION AREA
13:10

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWP6
13:10 - 13:30

Poster Walks presentations 6
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Laurens DE COCK (Md) (Moderator, Dendermonde, Belgium), Matthias WALCHER (Orthopaedic Surgeon) (Moderator, Würzburg, Germany)
13:10 - 13:30 #40837 - PWK21 Automatic software-based 3D-angular measurement for Weight-Bearing CT (WBCT) is valid.
Automatic software-based 3D-angular measurement for Weight-Bearing CT (WBCT) is valid.

Background The purpose of this study was to compare automatic software-based angular measurement (AM, Autometrics 2.0, Curvebeam, Warrington, PA, USA) with validated measurement by hand (MBH) regarding angle values and time spent for Weight-Bearing CT (WBCT) scans. Methods Five-hundred bilateral WBCT scans (PedCAT, Curvebeam, Warrington, PA, USA) were included in the study. Five angles (1st - 2nd intermetatarsal angle, talo-metatarsal 1-angle (TMT) dorsoplantar and lateral projection, hindfoot angle, calcaneal pitch angle) were measured with MBH and AM on the foot/ankle (side with pathology). Angles and time spent of MBH and AM were compared (t-test, homoscedatic). Results Mean age of the patients was 49 years (range, 18-85), 214 (43%) were male. 243 (49%) right and 257 (51%) left feet were analyzed with the following specific pathologies: osteoarthritis/instability, n=147 (29%); Haglund deformity/Achillodynia, n=41 (8%); forefoot deformity, n=108 (22%); Hallux rigidus, n=37 (7%); flatfoot, n=35 (7%); cavus foot, n=10 (2%); osteoarthritis except ankle, n=82 (16%). The angles did not differ between MBH and AM (each p>0.36, table 1). The null hypothesis was rejected. The power was 0.92. The time spent for MBH / AM was 44.5 / 1s on average per angle (p<.001). Conclusions AM provided angles which were not different from validated MBH and can be considered as a validated angle measurement method. The time spent was 97% lower for AM than for MBH. The investigator time spent is 97% lower for AM (1s per angle) than for MBH (44.5s per angle).
Martinus RICHTER (Rummelsberg, Germany), Stefan ZECH, Issam NAEF, Stefan A MEISSNER, Regina SCHILKE, Fabian DUERR
13:10 - 13:30 #41204 - PWK22 Delayed Wound Healing in Complex Hindfoot Surgery – An underappreciated problem?
Delayed Wound Healing in Complex Hindfoot Surgery – An underappreciated problem?

Delayed wound healing results in increased costs, repeated appointments, and unsatisfactory patient experience. We conducted an audit assessing incidence of delayed wound healing and causative factors. This was a prospective audit of 109 patients undergoing foot and ankle surgery in a tertiary unit over four months. The standard was for 90% of wounds to heal by two weeks. Patients were seen by clinical nurse specialists at two weeks for wound review and management as required. We examined demographics, co-morbidity, type of surgery, and wound closure. Procedures included Forefoot (43%), Midfoot (13%), Non-fusion Ankle (14%) Hind foot/Ankle Fusion (14.5%), and Cavus /Planus correction (15.5%). Multinomial logistic regression was used to identify factors associated with delayed healing. 18 patients (16.5%) had delayed wound healing, requiring an additional 4 weeks to heal (2-20 extra weeks). All patients wounds healed with dressings and only 2 required antibiotics. Delays were seen in 32% of patients with multiple co-morbidity versus 12% in those without (p=0.03). The strongest predictive factor was type of surgery, with complex cases (hindfoot/ankle fusion; cavus/planus correction) associated with a delayed healing rate of 42.4% versus 5.3% for others (p<0.001, Odd’s Ratio 19.6). When considering complexity of surgery, co-morbidity did not independently predict wound healing delays. Healing rates for simple cases met our audit standard. However, complex ankle/hindfoot cases had a 20-fold increase in delayed healing. Units undertaking complex work should be cognisant of the increased burden to patients and clinic time. Patients should be counselled, and complications monitored within a governance framework.
Angelica GHEORGHE, Karen ALLIGAN, Karan MALHOTRA, Cullen NICHOLAS, Shelain PATEL, Wilthelmino RONGAVILLA, Matthew WELCK (london, United Kingdom)
13:10 - 13:30 #42546 - PWK23 Radiological Posterior Medial Safe Zone of the Ankle. Protecting the Posterior Tibial Tendon During Ankle or Pilon Fracture Fixation.
Radiological Posterior Medial Safe Zone of the Ankle. Protecting the Posterior Tibial Tendon During Ankle or Pilon Fracture Fixation.

Background: The surgical treatment of pilon and posterior malleolar fractures can risk damage to the posterior tibial tendon (PTT). Our aim in this study was to identify the medial fluoroscopic safe zone, to prevent inadvertent injury to PTT during both direct and indirect fixation. Methods: A cadaveric study was performed using 9 fresh frozen cadavers. A medial posteromedial approach was performed on each specimen to expose the PTT sheath. A flexible wire was placed down the lateral aspect of PTT sheath as a radio opaque marker. Fluoroscopic imaging was performed in the anteroposterior and lateral position to identify a medial safe zone. Results: In all specimens, the wire was located medial to a vertical line corresponding to the articular surface (the medial safe zone line) of the medial malleolus on anteroposterior imaging. On lateral imaging, the marker followed the medial malleolus obliquity and continued to correspond to 30% of the posterior plafond. Conclusion: This study demonstrated that a medial safe zone fluoroscopic landmark is unambiguous in localizing the PTT sheath and that any metal work medial to this line is likely to be at risk of damaging the tibialis posterior tendon. The lateral radiograph showed that any anteroposterior screw could involve the PTT sheath even if the penetration is only 70% across the tibial width. Clinical relevance: We described a radiographic and clinical safe zone to protect PTT during fixation and hardware placement. This information will assist surgeons in avoiding hardware placement that can damage PTT.
Vasileios LAMPRIDIS (UK, United Kingdom), Ben JONES, Junaid AAMIR, William HARRISON, Kyle ROUGHNEEN, Alastair BOND, Lyndon MASON
13:10 - 13:30 #42585 - PWK24 Distance mapping patterns analysis of tibiotalar joint in ankle osteoarthritis: The battleship technique.
Distance mapping patterns analysis of tibiotalar joint in ankle osteoarthritis: The battleship technique.

Background: Weightbearing computed tomography (WBCT) enables the creation of intraarticular distance mapping (DM), an algorithm which assesses the distance between articular surfaces and assigns predetermined colors to generate a visual representation of the joint interaction. Similar foot and ankle (FA) alignments have demonstrated to share DM patterns. This study aims to create predictable DM patterns in patients with OA of the tibiotalar joint, using a novel method created by the authors coined the "battleship technique," and evaluate whether these patterns correspond to FA alignment. Methods: Forty OA ankles were included. We calculated the DM weighted sum of the tibiotalar joint using the battleship technique (BTT) to obtain a single coordinate representing the deformity's apex on the X- and Y-axis. Patients were divided into two coronal groups (valgus and varus) and two sagittal groups (anterior translation and posterior translation) and compared. Results: There was a statistically significant difference between the coronal group in α, talar surface, hindfoot alignment, and talar tilt angles and β angle and tibiotalar ratio in the sagittal groups. A statistically significant correlation was found between the talar surface and talar tilt angle to the location of the X-coordinate and between the β angle and the tibiotalar ratio to the location of the Y-coordinate. Conclusion: The battleship technique can create predictable DM patterns in patients with advanced OA changes in the tibiotalar joint. This pattern corresponds to the ankle alignment in the coronal and sagittal plane, indicating that this technique could locate the intraarticular deformity's apex.
Efrima BEN, Agustin BARBERO (Milan, Italy), Cristian INDINO, Camilla MACCARIO, Federico USUELLI
13:35

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWK7
13:35 - 13:55

Poster Walks presentations 7
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Nick CULLEN (Consultant foot and ankle surgeon) (Stanmore uk, United Kingdom), Ezequiel PALMANOVICH (ezepalm@gmail.com) (Kfar Saba, Israel)
13:35 - 13:55 #42577 - PKW25 The influence of pre-operative reduction quality on post-operative wound complications in ankle fractures: a review of 247 cases.
The influence of pre-operative reduction quality on post-operative wound complications in ankle fractures: a review of 247 cases.

The initial management for unstable ankle fractures involves urgent fracture reduction and immobilisation. However, opinions vary on the definition of an adequate pre-operative reduction. We hypothesised that residual tibiotalar subluxation may limit the resolution of soft tissue swelling and impair post-operative wound healing. This study aimed to evaluate the rate of wound complications following ankle fracture fixation according to the quality of pre-operative reduction. We conducted a retrospective case series of all ankle fractures in adults (> 18 years old) treated with surgical fixation at a district general hospital from January 2020 until July 2023. Pre-operative reduction was categorised as adequate or inadequate according to the absence or presence of residual tibiotalar joint subluxation on post-manipulation radiographs, respectively. Wound complication was defined as any wound problem requiring dressing care, antibiotics, or a return to theatre. 247 patients were included in this study, with a mean follow-up duration of 21.6 weeks. 98 (39.7%) patients had an inadequate pre-operative reduction with residual subluxation of the tibiotalar joint. There were 29 (11.7%) cases of post-operative wound complications, of which 7 (24.1%) required surgical interventions. The rate of wound complications was higher in patients with an inadequate pre-operative reduction compared to those in whom adequate reduction was achieved (17.3% versus 8.1% respectively, p = 0.026). Inadequate pre-operative reduction with residual tibiotalar subluxation is a risk factor for post-operative wound complications in ankle fractures. Urgent intervention is warranted in cases with persistent subluxation despite multiple attempts at closed reduction.
Rye Yern YAP (Hereford, United Kingdom), Peter LOGAN, Mohammad IQBAL, Vishwajeet KUMAR, Zaid AL-WATTAR
13:35 - 13:55 #42578 - PKW26 Comparison of the measurement of the Calcaneal X/Y ratio on plain radiographs and CT scan.
Comparison of the measurement of the Calcaneal X/Y ratio on plain radiographs and CT scan.

Background: In 2018, Tourne et al introduced the X/Y ratio as a novel radiological parameter to assess relative calcaneal length. Their research concluded that any calcaneum showing a ratio less than 2.5 can be considered “long” predisposing for the Haglund's syndrome. The aim of our study was to evaluate the accuracy of the XY ratio measurement on the plain radiographs reflecting the morphology of the calcaneum. Methods: Two assessors measured the X/Y ratio of fifty patients on the plain radiograph using the Tourne et al’s technique. The X/Y ratio was also assessed on sagittal cuts of the CT scan of the ankle joint, with the axis of the CT scan image adjusted on the axial cut to run parallel to the long axis of the calcaneum. Results: The mean X/Y ratio measurements of the two assessors on X-ray (2.71±0.43 and 2.69±0.41) were lower than those measured on CT (3.14±0.44 and 3.10±0.44). The intra-observer agreement for X-ray and CT scan ratios was poor for both assessors (ICC = .487 and .476). Interobserver reliability of the X/Y ratio measured on plain radiographs was good, and it was excellent when measured on CT scans (ICC = .808 and .956). Conclusions: The poor agreement between the measurement on X-ray and CT scan indicates that the X/Y ratio on X-ray doesn’t necessarily reflect the true morphology of the Calcaneum. Our study is the first to assess the X/Y ratio on CT scan. the excellent interobserver agreement shows that it is a reliable method.
Hesham OSHBA (Crowthorne, United Kingdom), Kate NICHOLLS, Togay KOC, Neeraj PUROHIT, Raghda SHAABAN
13:35 - 13:55 #42590 - PKW27 Enhancing precision in osteochondral lesion of the talus measurements and improving agreement in surgical decision-making: A comprehensive evaluation using weight-bearing computed tomography and distance mapping for preoperative planning.
Enhancing precision in osteochondral lesion of the talus measurements and improving agreement in surgical decision-making: A comprehensive evaluation using weight-bearing computed tomography and distance mapping for preoperative planning.

Purpose: Weight-bearing CT (WBCT) enables three-dimensional modeling of ankle morphology, while distance mapping (DM) provides color-coded representation of intraarticular distance, particularly beneficial for delineating osteochondral lesions of the talus (OLT). This study aims to assess DM's reliability in measuring OLT surface, depth, and volume and its role in achieving consensus among surgeons regarding optimal surgical intervention. Methods: Thirty-six patients with 40 OLTs underwent WBCT and DM evaluation. Two raters utilized DM to define lesion boundary (LB) and lesion fundus (LF) and calculate lesion depth, surface, and volume. Treatment options were selected based on measurements, and inter-rater and intra-rater agreement were assessed. Results: Interrater and intrareader agreement for lesion depth surface showed excellent correlation (0.90 - 0.94, p < 0.001). Cohen's Kappa analysis indicated near-perfect agreement (Kappa = 0.834, p < 0.001) for preferred preoperative plans. The study demonstrated that WBCT and DM together offer reliable measurements of OLT parameters, facilitating accurate treatment planning and enhancing interrater consensus among surgeons. Conclusion: WBCT-based 3D modeling and DM prove to be valuable tools for evaluating OLTs, providing precise measurements of surface, depth, and volume with excellent reliability. Integration of these techniques into preoperative planning enhances surgical decision-making, ensuring optimal outcomes for patients with OLTs. Further research may explore the broader applicability of WBCT and DM in orthopedic practice to improve treatment strategies and patient care.
Efrima BEN, Agustin BARBERO (Milan, Italy), Jari DAHMEN, Amit BENADY, Cristian INDINO, Camilla MACCARIO, Gino KERKHOFFS, Federico USUELLI
13:35 - 13:55 #42592 - PKW28 Comparison of hindfoot preoperative alignments and postoperative total ankle arthroplasty positioning using weight-bearing computed tomography-generated 3 dimensional models.
Comparison of hindfoot preoperative alignments and postoperative total ankle arthroplasty positioning using weight-bearing computed tomography-generated 3 dimensional models.

Background: Traditional imaging methods for total ankle arthroplasty (TAA) suffer from rotational bias and bone superimposition, necessitating more precise assessment techniques. Weight-bearing computed tomography (WBCT) and 3D models from WBCT have revolutionized foot and ankle alignment visualization, offering unparalleled detail. This study aims to compare preoperative hindfoot alignment with postoperative outcomes in TAA across three planes and assess measurement reliability. Methods: Eighty-one TAA patients underwent preoperative and postoperative WBCT, measuring five coronal angles (Alpha, TSA, TT, SA, TCA), three sagittal angles (Beta, Gamma, TTR), and one axial angle (PTARA). Two raters evaluated measurements pre- and post-surgery in separate sessions. Pre- and postoperative measurements were compared, and inter-rater and intra-rater reliability were calculated. Results: Significant changes were observed in three coronal (TSA, TT, SA) and two sagittal angles (Beta, Gamma) (P < 0.001). Alpha, TCA, TTR, and PTARA showed no significant changes (P > 0.05). Intra- and inter-rater reliability scores ranged from 0.885 to 0.97, indicating good to excellent correlation. Conclusion: WBCT-based 3D modeling facilitates detailed comparison of preoperative alignment and postoperative TAA positioning across coronal, sagittal, and axial planes, highlighting significant adjustments in coronal and sagittal alignments. The high reliability underscores the value of WBCT and 3D modeling in preoperative planning, enhancing surgical intervention accuracy.
Efrima BEN, Agustin BARBERO (Milan, Italy), Amit BENADY, Cristian INDINO, Camilla MACCARIO, Federico USUELLI
14:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWK8
14:00 - 14:20

Poster Walks presentations 8
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Elisabeth ELLINGSEN HUSEBYE (Norway), Anja HELMERS
14:00 - 14:20 #42593 - PWK29 Reliability of cone beam weightbearing computed tomography analysis of total ankle arthroplasty positioning and comparison to weightbearing x-ray measurements.
Reliability of cone beam weightbearing computed tomography analysis of total ankle arthroplasty positioning and comparison to weightbearing x-ray measurements.

Background: The current reference standard for postoperative evaluation of total ankle arthroplasty (TAA) positioning, weightbearing radiography (WBXR), is subject to technical bias. Weightbearing cone beam computed tomography (WBCT) enables visualization of the foot's complex 3-dimensional (3D) structure under standing load. To date, no WBCT-based system for TAA positioning has been validated. The purpose of this study was to (1) assess TAA positioning using WBCT 3D models and (2) evaluate the agreement levels between 2 raters and thus evaluate the intermethod reliability with respect to WBXR. Methods: Fifty-five consecutive patients were retrospectively reviewed. Two raters independently created a 3D WBCT model using dedicated software and recorded the following measurements: α angle, tibiotalar surface angle (TSA), hindfoot angle (HFA), tibiotalar ratio (TTR), β angle, γ angle, and Φ angle. Measurements were repeated 2 months apart in similar, independent fashion and compared to WBXR. Interobserver, intraobserver, and intermethod agreements were calculated. Results: All 7 measurements showed good to excellent intraobserver and interobserver reliability (ICC 0.85-0.95). The intermethod (WBCT vs WBXR) agreement showed good agreement for the γ angle (ICC 0.79); moderate agreement levels for the α angle, TSA angle, β angle, and TTR (ICC 0.68, 0.69, 0.70, and 0.69, respectively); poor agreement for the HFA (ICC 0.25); and negative agreement for the φ angle (ICC −0.2). Conclusion: Position analysis of TAA using WBCT demonstrated good to excellent interobserver and intraobserver agreement and can be reliably used. Additionally, a negative to moderate agreement between standard WBCT and standard WBXR was found.
Efrima BEN, Agustin BARBERO (Milan, Italy), Cristian INDINO, Camilla MACCARIO, Federico USUELLI
14:00 - 14:20 #42602 - PWK30 Anterior Translation of the Talus Post Anterior Pilon Fixation. Are we Missing Something?
Anterior Translation of the Talus Post Anterior Pilon Fixation. Are we Missing Something?

Background: Anterior Pilon fractures are uncommon injuries to the ankle. Fixation of the fracture is commonly undertaken, however concomitant injury to the anterior talofibular ligament (ATFL) is not commonly addressed. There are no current studies assessing talus translation in anterior Pilon fractures. Objective: To assess incidence of persistent talus anterior translation in Pilon fractures affecting the anterior plafond. Methods: A retrospective analysis of a prospectively collected database in a major trauma centre was undertaken to establish eligible patients. All patients with Pilon fractures with anterior components undergoing reduction and fixation were included. Intraoperative and weightbearing postoperative radiographs were assessed for fracture reduction and anterior talus translation. The Topliss Classification was used for pilon type characterisation. Results: A total of 57 patients were identified who could be included in the study. The mean age of patients was 43.60 years (95% CI 39.87, 47.33). Out of the full cohort, 80.70% (46/57) were judged to be anatomically reduced. There were 39 patients (68.42%) with persistent anterior talus translation. There was no significant difference between types of Pilon fractures (p=.581). There was a higher rate of persistent anterior translation with coronal fracture types 72.73% (32/44) as compared to sagittal fracture types 53.85% (7/13). Conclusion: Over half the patients in this study had persistent anterior talus translation post fixation despite being anatomically reduced. The fracture mechanism to sustain an anterior Pilon is likely to injure the ATFL, which if unrepaired, may remain unstable. Cartilage loss and over compression of the fracture are other possible aetiologies.
Vasileios LAMPRIDIS (UK, United Kingdom), James MCEVOY, William HARRISON, Lyndon MASON
14:00 - 14:20 #42612 - PWK31 Impact of Initial Tendon Gap Size on Outcomes of Functional Rehabilitation in Achilles Tendon Rupture.
Impact of Initial Tendon Gap Size on Outcomes of Functional Rehabilitation in Achilles Tendon Rupture.

This study investigates the relationship between the initial gap size of a ruptured Achilles tendon and patient outcomes following a functional rehabilitation program. Factors like age and activity level typically influence treatment decisions, but the gap size between tendon ends remains debated. The research focuses on defining any correlation between the initial tendon gap and outcomes in patients treated non-surgically with functional rehabilitation. Method: A prospective case series study was conducted on patients with acute Achilles tendon rupture treated non-surgically with a functional rehabilitation program from 2016 to 2018. The tendon gap was measured via ultrasound at the initial presentation. Patients were followed for at least 12 months and evaluated using the Achilles Tendon Rupture Score (ATRS), plantarflexion strength, and re-rupture rate. Results: Out of 56 patients who completed the one-year follow-up, 2 experienced re-ruptures. The average plantarflexion gap was 13.7 mm. The mean ATRS at 12 months was 85.12. No statistically significant correlation was found between the final ATRS and the initial rupture gap. Conclusion: The outcome following non-operative functional rehabilitation treatment of ruptured Achilles tendon did not correlate with the size of the tendon gap, and the authors recommend that the decision on functional rehabilitation should not be based on these criteria.
Amr ABOUELELA (England, United Kingdom), Islam MUBARK
14:00 - 14:20 #42652 - PWK32 Digital monitoring of weight-bearing improves success rates and reduces complications in lower extremity surgeries.
Digital monitoring of weight-bearing improves success rates and reduces complications in lower extremity surgeries.

The aim of this study is to develop a digital monitoring system to track weight and evaluate its impact on postoperative outcomes after lower extremity surgeries (LES). This parallel randomized controlled trial enrolled 266 patients who underwent LES (fracture or joint replacement) at our medical center between March 11, 2022, and January 10, 2023. Patients were randomly assigned to the intervention and control groups in a 1:1 ratio. The intervention group (n=116) used a cane and shoes equipped with a weight-bearing system after lower limb surgery, while the control group (n=116) used a simple cane and shoes without a weight-bearing system. The primary outcomes included callus formation, duration of union, and success rate of union in the two groups. The intervention group had a significantly higher rate of complete surgical success than the control group (93.9% vs. 79.3%, p=0.001). The intervention group also had a significantly lower risk of non-union than the control group (OR: 2.33, 95% CI: 1.14, 3.48, p=0.001). The mean duration of surgery until the time of union and the meantime of callus formation was significantly lower in the intervention group (p=0.01). The use of a digital monitoring system for weighing in LES significantly increased the success rate and reduced post-operative complications. Therefore, incorporating this system can enhance the rehabilitation process and prevent revision surgeries in patients with LES.
Babk OTOUKESH, Shayan AMIRI (Tehran, Islamic Republic of Iran)
14:20

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWK9
14:20 - 14:40

Poster Walks presentations 9
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters

Moderators: Hans-Jörg TRNKA (Director) (Vienna, Austria), Alistair WILSON (Consultant) (Belfast, United Kingdom), Emre BACA (assoc. prof) (istanbul, Turkey)
14:20 - 14:40 #42759 - PWP33 The kinematics of the distal tibiofibular joint in syndesmosis instability and its reconstruction - a biomechanical in vitro study.
The kinematics of the distal tibiofibular joint in syndesmosis instability and its reconstruction - a biomechanical in vitro study.

The aim of the present study was to investigate the stability of the syndesmosis after transection and the effect of stabilization with rigid and dynamic reconstruction techniques. Syndesmosis stability was investigated using a six-axis industrial robotic arm on human lower leg specimens (n=14). In neutral position, dorsiflexion and plantar flexion, stability was examined using an external rotation stress test under an axial load of 200 Newtons. The examination was performed on the intact syndesmosis and the sequentially transected syndesmosis (1. transection of anterior inferior tibiofibular ligament (AITFL); 2. transection of interosseous ligament (IOL); 3. transection of posterior inferior tibiofibular ligament (PITFL). Reconstruction was then performed using either various screw techniques (n=7) or a dynamic suture button system (Arthrex Tightrope, n=7). In the coronal plane, both rigid and dynamic reconstruction techniques led to an equivalent reduction in lateralization. In the axial plane, transection of the AITFL did not lead to significant rotational instability, whereas transection of the IOL led to instability. Stability could be reconstructed by implantation of 2 tricortical set screws, whereas instability remained with dynamic reconstruction. In the sagittal plane, a dorsal displacement of the AITFL already occurred when the AITFL was cut. This could be stabilized with all screw reconstructions, but not with the suture button procedures. The results indicate instability of the fibula, particularly in the sagittal and axial plane. In addition, our model shows an equivalence of the different screw techniques and the reconstruction with two suture buttons.
Alexander MILSTREY (Muenster, Germany), Vivienne HOELL, Jens WERMERS, Stella GARTUNG, Michael RASCHKE, Julia EVERS, Sabine OCHMAN
14:20 - 14:40 #42886 - PWP34 Bio-integrative screws versus metallic screws for calcaneus osteotomies: a non-inferiority randomized clinical trial.
Bio-integrative screws versus metallic screws for calcaneus osteotomies: a non-inferiority randomized clinical trial.

Introduction The use of bio-integrative implants in orthopedic surgery is growing. While many biomechanical and histological reports could sustain its structural and biological properties, few clinical studies support its use. This trial aims to determine the bio-integrative screws' capacity to reach non-inferior clinical and radiographical outcomes of current metallic screws in calcaneus osteotomies. Methods This was a single center, in parallel groups, randomized, non-inferiority clinical trial (NCT05018130) including patients undergoing open calcaneal sliding osteotomy. Surgeries were performed respecting the same technique, using 2 canulated 4mm screws, either titanium or fiber. Primary outcome was bone healing by weight-bearing computed tomography at the 6th postoperative week. Secondary outcomes included healing, minor and major assessed until 48 weeks of follow-up. Readings were performed by two assessors. Results 24 feet were included in the study. Groups were similar demographically (ps>0.37), with 12 allocated to the bio-integrative and 12 to the metallic groups. The mean follow-up was 23.3 months (15-33) with no losses. Considering bone healing at six weeks, the bio (83.3%) and the metallic (66.7%) groups had similar rates (p=0.320), what was maintained at 12 weeks (100% vs. 91.7% respectively; p=0.500). Minor complications were similar between groups (16.7% vs. 16.7%; p=1), all resolved by six weeks. No major complications and no secondary surgeries were observed. Conclusion Bio-integrative screws presented non-inferior results to metallic screws when used in calcaneus osteotomies, considering bone healing and complications. Larger and longer trials are necessary to determine the superiority of any implant and its impact on orthopedic surgery.
Nacime Salomao BARBACHAN MANSUR, Eli SCHMIDT, Francois LINTZ, Chinelati ROGERIO, Matthieu LALEVEE, Cesar DE CESAR NETTO (Iowa City, USA)
14:20 - 14:40 #42888 - PWP35 Biomechanical evaluation of screw vs. k-wire reconstructions for instable Lisfranc injuries.
Biomechanical evaluation of screw vs. k-wire reconstructions for instable Lisfranc injuries.

There is currently no consensus regarding the choice of implant for instable Lisfranc injuries. The aim of this study was to investigate the effects of a transection of the Lisfranc ligaments on the height of the foot and the distance between the Os cuneiforme mediale (CM) and Os metatarsale 2 (MT2). In a second step, the stability of screw vs. K-wire reconstruction was investigated. 16 human specimens were loaded with 200N and 700N in a testing machine. Sequential measurements were performed in the native state and after cutting the dorsal, interosseous and plantar Lisfranc ligaments. In a final step, the entire tarsometatarsal (TMT) ligaments were transected. Subsequently, in two groups of 8 paired specimens each, TMT joints 1-3 were addressed with 3.5mm screws or 2.0mm K-wires, TMT joints 4-5 were always addressed with 2.0mm K-wires. Biomechanical and radiological analysis was performed. Already at 200N loading, there was a relevant loss of height of the CM (p=0.0005) and MT2 (p=0.002) after transection of the dorsal ligament. The screw reconstruction successfully restored the height and distance of both the CM (p=0.0101) and the MT2 (p=0.0088). The K-wire reconstruction did not achieve a significant improvement on both the CM (p=0.8358) and the MT2 (p=0.9981) under load. Especially in unstable Lisfranc injuries, the screw versus K-wire reconstructions were superior. Vertical instability could be determined as a sensitive parameter that is not yet regularly used in diagnostics. An increase in the axial distance between CM and MT2 only occurs when all ligaments are injured.
Alexander MILSTREY (Muenster, Germany), Franziska WERMELING, Julia EVERS, Michael RASCHKE, Sabine OCHMAN
14:20 - 14:40 #42961 - PWP36 Research on Determining Bony Landmarks for Accurate Tibiofibular Syndesmotic Fixation: Cadaveric Validity and Safety Analysis of Angle Bisector Method.
Research on Determining Bony Landmarks for Accurate Tibiofibular Syndesmotic Fixation: Cadaveric Validity and Safety Analysis of Angle Bisector Method.

Introduction Determining the optimal intraoperative fixation angle for syndesmosis remains uncertain and depends on the surgeon. This study aims to evaluate whether the angle bisector method can provide a patient- and level-specific syndesmotic fixation angle that is reproducible and safe in a cadaveric setting. Methods Funded by the AOFAS Research Grants Program, cadaveric leg specimens underwent fixation using the angle bisector method at two levels (2-cm and 3.5-cm proximal) parallel to the tibial plafond by two surgeons. The angle bisector method involved a drill and screw directed along the bisector of the angle, formed between two K-wires at the fixation level. Post-fixation CT images were analyzed to measure the angle between the true centroidal axis and the screw axis. Distances between the centroidal axis and screw entry points, as well as between K-wires and major neurovascular structures, were measured and documented. Results The average angle between the centroidal axis and screw trajectory was 2.7 degrees at the 2-cm level and 1.8 degrees at the 3.5-cm level. The distance between entry points averaged 1.7 mm at 2-cm and 1.2 mm at 3.5-cm. Results showed low inter-surgeon variability and high intra- and inter-observer reliability (ICC > 0.80). Trajectories differed significantly between levels. The distance between K-wires and neurovascular structures was always over 5 mm, with no damage noted, confirming the method's safety. Conclusion The angle bisector method provides an accurate and safe syndesmotic fixation trajectory. This technique can be easily implemented using K-wires or a specially designed jig.
Bedri KARAISMAILOGLU (Istanbul, Turkey), Julian HOLLANDER, Jiyong AHN, Siddhartha SHARMA, Matthias PEIFFER, Lorena BEJARANO-PINEDA, Daniel GUSS, John Y KWON, Christopher DIGIOVANNI, Soheil ASHKANI-ESFAHANI, Gregory WARYASZ
15:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
FP3
15:00 - 16:00

FREE PAPERS 3: Forefoot

Moderators: Alberto GINÉS CESPEDOSA (Adjunto) (Moderator, Barcelona, Spain), Sabine OCHMAN (Consultant) (Moderator, Muenster, Germany)
15:00 - 15:06 #41114 - OP21 The surgical treatment of brachymetatarsia by one-stage lengthening of the metatarsal bone using an autograft from tubular bones of the foot.
The surgical treatment of brachymetatarsia by one-stage lengthening of the metatarsal bone using an autograft from tubular bones of the foot.

Introduction. Brachymetatarsia is a fairly rare pathology that is characterized by shortening of the metatarsal (or metatarsals) bones due to premature closure of the growth plate. However, most patients suffering from this pathology require surgical treatment. Purpose of the study: to improve the results of treatment of patients with brachymetatarisis by introducing into surgical practice the method of simultaneous lengthening of the metatarsal bone using an autograft from the tubular bones of the foot. Materials and methods. This article presents a comparison of treatment results between two groups of patients. The main group of patients (40 patients, 50 feet) underwent simultaneous lengthening of the shortened metatarsal bone using autografts from tubular bones of the foot. The control group of patients (25 patients, 33 feet) underwent distraction osteosynthesis of the metatarsal bone using an external fixation device. Results. The results obtained during the study suggest the advantage of the method of one-step lengthening of the metatarsal bone using autografts from tubular bones of the foot over the distraction method. Patients in the main group had a shorter healing period compared to the control group (8.1±1.3 and 16.2±2.4 weeks, respectively), and fewer complications. Also, patients of the main group in the early postoperative period noted a high cosmetic result of the operation. Conclusions. By using the developed method of surgical treatment, we were able to significantly reduce the treatment time for patients, as well as achieve high aesthetic results.
Levon MAKINYAN (Moscow, Russia), Albert MANNANOV, Vladislav APRESYAN
15:06 - 15:12 #41639 - OP22 Minimally Invasive Chevron Akin (MICA) Osteotomy Corrects Radiographic Parameters but Not Central Metatarsal Loading in Moderate to Severe Hallux Valgus Without Metatarsalgia.
Minimally Invasive Chevron Akin (MICA) Osteotomy Corrects Radiographic Parameters but Not Central Metatarsal Loading in Moderate to Severe Hallux Valgus Without Metatarsalgia.

Background: Central metatarsal pressure is increased in patients with hallux valgus, but the pedographic outcomes after hallux valgus (HV) correction are inconclusive. No known literature reports the pedographic outcomes after HV correction with Minimally Invasive Chevron and Akin Osteotomy (MICA). Methods: A consecutive series of 31 feet from 25 patients with moderate-to-severe symptomatic HV without metatarsalgia underwent MICA and were prospectively evaluated using radiographic parameters and pedographic measurements (Footscan®, RSscan International, Olen, Belgium). Data were collected preoperatively and 3 months after surgery. Results: Radiographic parameters of hallux valgus angle, intermetatarsal angle, distal metatarsal articular angle, first metatarsal head lateral shape, and lateral sesamoid grade significantly improved after MICA. The corrected first metatarsal length was significantly shortened by 2.3 mm, with consistent second metatarsal protrusion distance, lateral Meary’s angle, and calcaneal pitch angle. Max force, max pressure, cumulative force, and cumulative pressure on the central metatarsals did not show significant changes between pre- and post-operative measurements, while these parameters significantly decreased in the hallux and first metatarsal area. Conclusion: MICA effectively corrects radiographic parameters but does not reduce central metatarsal loading in patients with moderate-to-severe HV without metatarsalgia.
Hsu WEI-KUO, Tie TUNG-HEE ALBERT, Yanyu CHEN (Changhua, Taiwan)
15:12 - 15:18 #43158 - OP23 Comparative Biomechanical Study of Different Screw Fixation Methods Following Minimally Invasive Chevron-Akin (MICA): A Finite Element Analysis.
Comparative Biomechanical Study of Different Screw Fixation Methods Following Minimally Invasive Chevron-Akin (MICA): A Finite Element Analysis.

Background: Minimally Invasive Chevron-Akin (MICA) hallux valgus (HV) deformity correction utilizes an extra-articular distal first metatarsal chevron osteotomy that is held with rigid fixation using two fully threaded screws, of which one is bicortical to provide stability. However, the necessity of two screws is debated, as is the necessity of bicortical fixation. Despite the clinical success of MICA, there is a lack of biomechanical studies assessing the stability and strength of different fixation constructs. Methods: A 3D foot finite element model was developed from computed tomography images of a female patient with moderate HV deformity. Five different screw configurations were assessed using FEA, including fourth-generation MICA fixation with 2 screws (one bicortical and one intramedullary), 2 intramedullary screws, 2 bicortical screws, 1 intramedullary screw, and 1 bicortical screw. Loading conditions involved a vertical ground reaction force applied to the midfoot, with simulated 150N and 300N loads. Stress analysis considered osteotomy displacement, maximum and minimum principal stresses, and equivalent von Mises stress for both implants and bone. Results: FEA indicated that MICA fixation with two screws (one bicortical and one intramedullary) demonstrated the lowest values for osteotomy displacement, minimum and maximum total stress, and equivalent von Mises stress on the bone and screws in both loading conditions. Conclusion: This biomechanical analysis provides valuable insights into the strength of different MICA screw fixation configurations, highlighting the superiority of classical MICA fixation configurations with two screws in terms of stability and stress distribution.
Thomas LEWIS, Henrique MANSUR, Gabriel FERREIRA, Miguel VILHO, Leonardo BATTAGLION, Roberto ZAMBELI, Robbie RAY (London, United Kingdom), Gustavo NUNES
15:18 - 15:24 #42948 - OP24 Does decompressive chevron osteotomy decrease subchondral bone density of the 1st metatarsophalangeal joint in hallux rigidus?
Does decompressive chevron osteotomy decrease subchondral bone density of the 1st metatarsophalangeal joint in hallux rigidus?

Objective: To investigate the impact of decompressive chevron osteotomy on subchondral bone density at the first MTP joint. Methods: Sixteen feet (12 patients) with hallux rigidus underwent decompressive chevron osteotomy. Pre- and post-operative standing cone beam 3DCT were assessed, and clinical data was collected. Radiologic measurements, including bone density using Hounsfield units (HU), were conducted. Statistical analyses were performed to evaluate changes and correlations. Results: Post-operative bone density significantly decreased in proximal (Pre, 650.9±149.1; Post, 312.4±115.9; p<0.001) and distal (Pre, 910.4±143.3; Post, 639.0±167.1; p<0.001) components of the first MTP (joint and the first TMT (Pre, 762.9±166.6; Post, 611.5±165.9; p=0.015) joint. No significant difference was measured at the TT joint (Pre, 497.5±143.6; Post, 534.3±130.7; p=0.463). Length of the first metatarsal (Pre, 60.4±3.4; Post, 54.3±3.0; p<0.001) and metatarsal protrusion index (MPI) (Pre, -0.9±3.0; Post, -9.0±3.6; p<0.001) significantly decreased post-operatively. Clinical assessments showed significant improvements in AOFAS scores (36.1±14.5 points) and pain on VAS scale (- 5.3±1.9). Conclusion: Decompressive chevron osteotomy leads to a significant decrease in subchondral bone density of the first MTP joint. A decrease in bone density occurs also in the first TMT joint.
Luca TANEL (Bolzano, Italy), Matthieu LALEVEE, Philippe BEAUDET
15:24 - 15:30 #42986 - OP25 The presence of an avulsion fracture of the 1st tarso-metatarsal joint in Lisfranc injuries is a useful adjunct in the detection of 1st TMTJ instability.
The presence of an avulsion fracture of the 1st tarso-metatarsal joint in Lisfranc injuries is a useful adjunct in the detection of 1st TMTJ instability.

Aims Ligamentous Lisfranc injuries often feature avulsion fractures of the tarso-metatarsal joint (TMTJ). A proportion of these will have a congruent TMTJ joint on initial imaging, and many of these patients will have an unstable TMTJ which requires stabilisation. The study aimed to determine the relationship between the presence of an avulsion fracture on initial imaging and instability of the first TMTJ. Methods A prospective database of Lisfranc fracture-dislocations was analysed for the presence of TMTJ1 avulsion fractures. All cases were managed with examination under anaesthesia (EUA) and stress testing under image intensification prior to fixation or arthrodesis surgery. The rate of TMTJ1 instability and the sensitivity and specificity of the presence of an avulsion in detecting instability was determined. Results 153 patients with a mean age of 35.2 years were included. 99 injuries (64.7%) had an avulsion fracture of TMTJ1 on imaging. Of these, 76.7% had a congruent joint on XR or CT scan. 91.9% of patients with an avulsion fracture demonstrated instability on EUA stress testing. Amongst the 54 cases showing no avulsion, 23 (42.6%) were unstable on EUA. The presence of an avulsion had a sensitivity of 79.8% and a specificity of 79.5% in the detection of instability. Conclusions The presence of an avulsion fracture of TMTJ1 is highly suggestive of instability. This finding should lower the threshold to perform EUA stress testing. A high proportion of Lisfranc injuries without avulsion fractures have TMTJ1 instability, and therefore the absence of this finding does not reliably exclude instability.
Prashant SINGH (London, UK, United Kingdom), Neil JONES, Marco PES, Francesc MALAGELADA, Amit PATEL, Lucky JEYASEELAN
15:30 - 15:36 #41019 - OP26 Noninferiority of copper dressings compared to negative pressure wound therapy in diabetic foot – an RCT study.
Noninferiority of copper dressings compared to negative pressure wound therapy in diabetic foot – an RCT study.

Aim: Compare the wound healing rate, cost, and convenience between Negative Pressure Wound Therapy (NPWT) and Copper Oxide Dressings (COD) in the management of diabetic foot wounds (DFW). Method: A Randomized controlled trial (RCT) with 46 DFW, in whom NPWT was indicated. Twenty-three patients were enrolled in the COD and NPWT arm for three months or wound closure. The primary endpoint was wound size reduction, assessed by "Tissue Analytic" program. Secondary endpoints were convenience, application time, pain, and cost. Results: The initial wound area was 19.9±4.36 and 14.1±2.32 cm2 in the COD and NPWT arms, respectively (p=0.25). Wound size reduction was statistically significant non-inferior of the COD Arm compared to the NPWT (p=0.04) and superior in the last visit (T-test, p=0.032). 11 (47.8%) and 8 (34.8%) wounds were closed during the study in the COD and NPWT arms respectively (P=0.37). COD therapy was more convenient for the patients (Visual Analog Score [VAS] was 8.44 vs. 5.33; p=0.002) and the medical personnel (8.29 vs. 6.0; p=0.007), and less painful (1.15 vs. 2.19; p=0.67) in the COD arm compared to NPWT. The COD's mean application time was shorter (8.5 vs. 13.25 minutes; p<0.001). The cost of COD is estimated to be 84% less than NPWT treatment. Conclusion: This RCT study indicates statistically significant non-inferiority of COD dressing therapy than NPWT in terms of wound healing rate of DFW. Better convenience and reduced costs in the COD arm justify initial copper dressing attempts in patients with diabetic foot wounds before NPWT treatment.
Eyal MELAMED (Haifa, Israel), Jihad DABBAH, Michael PINZUR
15:36 - 16:00 Discussion.
AUDITORIUM

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
FP4
15:00 - 16:00

FREE PAPERS 4: Midfoot & Hindfoot

Moderators: Johannes HAMEL (Germany), Antonio VILADOT (orthopaedic Surgeon) (Barcelona, Spain)
15:00 - 15:06 #42939 - OP27 Middle Facet Subluxation in PCFD: Effects of Plane Orientation on WBCT Measurements.
Middle Facet Subluxation in PCFD: Effects of Plane Orientation on WBCT Measurements.

Introduction: Middle facet subluxation (MFS) and middle facet incongruence angle (MFIA) are commonly reported as marker of peritalar subluxation (PTS) in Progressive Collapsing Foot Deformity (PCFD). In the literature MFS and MFIA are assessed a true coronal plane which differs from the plane of the middle facet. We hypothesized that changes in the plane’s of measurement would lead to changes in the MFS and MFIA and as well its “dysplastic” appearance. Method: retrospective case-control study, 89 patients with PCFD and 11 controls. Measurements of MFS, MFIA, and middle facet dysplasia were conducted using both the classical method (taking measurements in the coronal plane as described in the literature) and the new method ( taking measurements after rotation of the coronal plane until it was perpendicular to the middle facet plane). A p-value of <0.05 was considered statistically significant. Results: Significant differences were observed between the two methods across all parameters, the new method demonstrated lower MFS (25.4% vs. 40.3%, p<0.0001), lower MFIA (4.7 degrees vs. 13.1 degrees, p<0.0001), and fewer dysplastic joints (1% vs. 37%, p<0.0001) For controls, only the MFIA was significantly different (p:0.0045) between methods. Conclusion: MFS is a complex deformity influenced by multiple parameters. The new method showed lower MFS, MFIA, and dysplasia measurements compared to current classical method. When assessing MFS, surgeons should be mindful that the plane of measurement relative to the structure is critical. We suggest using a plane of measurement perpendicular to the plane of the middle facet when assessing its subluxation.
Antoine ACKER (Geneva, Switzerland), Tommaso FLORIN VALECCHI, Emily LUO, Erik HUANUCO CASAS, Grayson TALASKI, Albert ANASTASIO, Samuel ADAMS, Cesar DE CESAR NETTO
15:06 - 15:12 #43152 - OP28 Medializing Calcaneal Osteotomy for progressive collapsing foot deformity alters the three-dimensional subtalar joint alignment.
Medializing Calcaneal Osteotomy for progressive collapsing foot deformity alters the three-dimensional subtalar joint alignment.

Background: While many studies were able to determine the hind- and midfoot alignment after a medializing calcaneal osteotomy (MCO), the subtalar joint alignment remained obscured by superposition on plain radiography. Therefore, we aimed to assess the hind-, midfoot- and subtalar joint alignment pre- compared to post-operatively using 3D weightbearing CT (WBCT). Methods: Seventeen patients with a mean age of 42±17 years were retrospectively analyzed. Inclusion criteria consisted of PCFD deformity corrected by a MCO as main procedure and imaged by WBCT before and after surgery. Exclusion criteria were patients who had concomitant calcaneal lengthening osteotomies, mid-/hindfoot fusions, hindfoot coalitions, and supramalleolar procedures. Image data were used to generate 3D models and compute the hindfoot (HA), midfoot (MA) - and subtalar joint (STJ) alignment in the coronal, sagittal and axial plane, as well as distance maps. Results: Pre-operative measurements of the HA and MA improved significantly relative to their post-operative equivalents p<0.05). The post-operative STJ alignment showed significant inversion (2.8°±1.7), abduction (1.5°±1.8), and dorsiflexion (2.3°±1.7) of the talus relative to the calcaneus (p<0.05) compared to the pre-operative alignment. The displacement between the talus and calcaneus relative to the sinus tarsi increased significantly (0.6 mm±0.5;p<0.05). Conclusion: This study detected significant changes in the sagittal, coronal, and axial plane alignment of the subtalar joint, which corresponded to a decompression of the sinus tarsi. These findings contribute to our clinical practice by demonstrating the magnitude of alteration in the subtalar joint alignment that can be expected after PCFD correction with MCO as main procedure.
Loïc RAES, Matthias PEIFFER, Tim LEENDERS, Kvarda PETER, Ahn JIYONG, Emmanuel AUDENAERT, Arne BURSSENS (Ghent, Belgium)
15:12 - 15:18 #42935 - OP29 Distinct Weight-Bearing CT Parameters in Pediatric vs. Non-Pediatric PCFD: Less Forefoot Abduction and Less Middle Facet Subluxation in Pediatric Cases.
Distinct Weight-Bearing CT Parameters in Pediatric vs. Non-Pediatric PCFD: Less Forefoot Abduction and Less Middle Facet Subluxation in Pediatric Cases.

Introduction: This study aims to evaluate differences with Weight-Bearing CT (WBCT) among a cohort of symptomatic Progressive Collapsing Foot Deformity (PCFD) patients with a history of pediatric flat foot (=pediatric PCFD), without (=non-pediatric PCFD), and a control group. We hypothesized that pediatric PCFD would display distinct WBCT parameters. Method: In this retrospective case-control study, pediatric PCFD was defined as flat feet since childhood, non-pediatric PCFD as foot shape changed in adulthood. 37 pediatric PCFD patients were compared to 52 non-pediatric PCFD patients and 11 control. Significance was set at a p-value < 0.05. A multivariate regression analysis was conducted to identify parameters associated with pediatric PCFD. Results: Compared to non-pediatric PCFD, the pediatric PCFD group showed a lower Foot and Ankle Offset (p<0.001), lower sagittal talus-first metatarsal angle (TFM) (p<0.001), lower axial TFM (p 0.0001), lower hindfoot moment arm (HMA)(p=0.0002), lower talonavicular uncoverage (p<0.0001), lower middle facet subluxation (p=0.0021), higher sinus tarsi (p<0.001), higher subfibular impingement (p<0.0001. Differences between the pediatric and control groups in (HMA) (p=0.053) and SF (p=0.07) were not statistically significant. When considering only WBCT parameters, multivariate regression analysis indicated that axial TFM (p:0.005), MFS (p:0.013), and ST (p:0.03) were the best predictors of pediatric PCFD. (R2 : 0.27). Conclusion: Pediatric PCFD is characterized by distinct WBCT parameters compared to non-pediatric PCFD, notably exhibiting less forefoot abduction, less middle facet subluxation a lower FAO and a hindfoot alignment closer to that of the control group. TFM, MFS, and ST stand out as parameters associated with pediatric PCFD.
Antoine ACKER (Geneva, Switzerland), Tommaso FLORIN VALECCHI, Emily LUO, Grayson TALASKI, Erik HUANUCO CASAS, Albert ANASTASIO, Cesar DE CESAR NETTO
15:18 - 15:24 #42931 - OP30 Comparable postoperative outcomes in obese and non-obese patients following surgery for insertional Achilles tendinopathy.
Comparable postoperative outcomes in obese and non-obese patients following surgery for insertional Achilles tendinopathy.

Introduction Higher body mass index (BMI) levels can increase the risk of complications and poor outcomes following surgical interventions for various orthopaedic conditions, including insertional Achilles tendinopathy (IAT). However, the exact impact of BMI on postoperative outcomes for IAT is still unclear and warrants further investigation. Methods Prospectively collected registry data of 75 patients who underwent surgery for unilateral IAT were reviewed. Patients were separated into 2 groups based on BMI: normal (<30 kg/m2) and obese (≥30 kg/m2). Clinical assessment at preoperative, 6-month and 2-year follow-up was performed using the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score, visual analog scale (VAS), 36-Item Short Form Health Survey (SF-36) physical (PCS) and mental (MCS) component summary scores, as well as assessment of postoperative satisfaction. Results There were 47 patients in the normal BMI and 28 patients in the obese group. Both groups showed significant improvement in AOFAS score, VAS score, SF-36 PCS and MCS at 6 months and 2 years postoperatively. However, there were no significant differences in these scores between the two groups and both groups achieved similar final postoperative scores at 2 years. Wound complications were more common in obese (n = 2, 7.1%) compared to normal BMI (n = 1, 2.1%) patients, but did not reach statistical significance (p =.284). Postoperative satisfaction (p = .394) were also similar between the two groups. Conclusion Obese patients undergoing surgery for IAT can achieve similar outcomes as those with normal BMI without the increased risk of complications.
Adriel You Wei TAY (Singapore, Singapore), Rui Xiang TOH, Kizher Shajahan MOHAMED BUHARY, Zongxian LI, Kae Sian TAY
15:24 - 15:30 #42989 - OP31 Objective diagnosis and evaluation of isolated gastrocnemius tightness in standing position: An Alternative to the Silfverskiöld Test.
Objective diagnosis and evaluation of isolated gastrocnemius tightness in standing position: An Alternative to the Silfverskiöld Test.

INTRODUCTION Gastrocnemius-soleus complex (GSC) tightness leads to functional pseudoequinism in the gait cycle, which translates into increased forefoot pressure. One of the most used tests to diagnose it is the Silfverskiöld test. We propose a different test to objectively evaluate the GSC shortening: In a standing position, a goniometer is used to evaluate ankle dorsiflexion. OBJECTIVES The main objective is to compare the reliability of the Silfverskiöld test versus the standing test. MATERIALS AND METHODS A cross-sectional observational study was conducted with 2 independent observers. The Silfverskiöld test was performed with goniometric measurement. Then, in standing position with both feet parallel facing forward, patients move one leg backwards with the knee fully-extended, progressively bending the knee placed in front. When discomfort appears in the calf region, a goniometric measurement is performed. Next, patients bend the knee placed backwards and same measurement is taken maintaining the heel touching the floor. Interrater reliability was assessed using the intraclass correlation coefficient (ICC) Two-way-Random-effects, mean of 2 raters, Absolute agreement (ICC2k) statistical test. RESULTS We performed 50 measurements for each test. Higher ICC was observed in the standing test (ICC=0.75) than Silfverskiöld test (ICC=0.68), making it more reliable (p<0,001). Normal dorsiflexion values in standing test ranged from 110,49º with knee extension to 119,85º with knee flexion. Patients with positive Silfverkiöld test, increased 13º in ankle dorsiflexion with standing test. CONCLUSION The standing position test could be a reliable alternative to the Silfverskiöld test in the diagnosis of GSC tightness, but more studies are needed.
Saiz Modol CONRADO (Pamplona, Spain), Lopez Capdevila LAIA, Llombart-Blanco RAFAEL, Valverde Gestoso CARMEN, Jimenez-Villarejo FRANCISCO, Dominguez Sevilla ALEJANDRO
15:30 - 15:36 #42032 - OP32 The size of Haglund’s deformity does not matter to insertional Achilles tendinopathy: A matched case control study.
The size of Haglund’s deformity does not matter to insertional Achilles tendinopathy: A matched case control study.

Background We aimed to investigate the effect of Haglund’s deformity size on insertional Achilles tendinopathy (IAT) using a new measurement system and identify independent risk factors of IAT with Haglund’s deformity. Methods We reviewed medical records of patients with IAT and age/sex-matched patients with diagnoses other than Achilles tendinopathy. Radiographs were reviewed to identify posterior/plantar heel spur, and intra-Achilles tendon calcification, and to measure Fowler-Philip angle, calcaneal-pitch angle, and Haglund’s deformity angle/height. Multivariate logistic regression analysis was performed to identify independent risk factors of IAT with Haglund’s deformity. Results 50 patients were enrolled in the study group, equaling the size of the age/sex-matched control group. Our new Haglund’s deformity measurement system showed excellent intraobserver /interobserver reliability. No significant differences between the two groups were noted in Haglund’s deformity angle and height: 6.0° in both groups, and 3.3mm Vs.3.2mm in the study and control group, respectively. The study group had significantly higher calcaneal pitch angle, incidence of posterior heel spur, plantar heel spur, and intra-Achilles tendon calcification: 5.2° Vs.23.1°(P=.044); 81.8% Vs.36.4%(P<.001); 76.4% Vs.34.5%(P=.003); 67.3% Vs.5.5%(P<.001), respectively. Multivariate logistic regression analysis identified independent risk factors of IAT: posterior heel spur(OR=3.650), intra-Achilles tendon calcification(OR=55.671) and increased calcaneal pitch angle(OR=6.317). Conclusion Based on our results, the Haglund’s deformity size was not associated with IAT, suggesting a routine Haglund’s deformity resection may be unnecessary in the surgical treatment of IAT. If patients with Haglund’s deformity have posterior heel spur, intra-Achilles tendon calcification, or increased calcaneal pitch angle, a higher chance of IAT can be predicted.
Wonyong LEE (Sayre, PA, USA, USA), Colt CRYMES
15:36 - 16:00 Discussion.
STUDIO
16:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
DF5
16:00 - 17:00

DISCUSSION FORUM
Evidence for Controversies in Foot and Ankle

16:00 - 17:00 Moderators. Paolo CECCARINI (Ortopaedic Surgeon) (Moderator, Perugia, Italy), Antonio DALMAU (Head of Department) (Moderator, Barcelona, Spain)
16:00 - 16:10 Syndesmotic fixation – screw vs flexible. Kristian BUEDTS (Md) (Speaker, Brussels, Belgium)
16:10 - 16:20 Plantar fasciopathy – gastroc lengthening vs proximal plantar fasciotomy. Alberto GINÉS CESPEDOSA (Adjunto) (Speaker, Barcelona, Spain)
16:20 - 16:30 Metatarsalgia - plantar plate repair vs isolated osteotomy. Nick CULLEN (Consultant foot and ankle surgeon) (Speaker, Stanmore uk, United Kingdom)
16:30 - 16:40 Ankle lateral instbility – Open vs all-inside-arthroscopic. Nuno CORTE REAL (Clinical Director) (Speaker, Cascais, Portugal)
16:40 - 17:00 Discussion.
STUDIO

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
DF6
16:00 - 17:00

DISCUSSION FORUM
State-of-the-art MP1 Arthrodesis Technique

16:00 - 17:00 Moderators. Christian PLAASS (Consultant) (Moderator, Hannover, Germany), Maneesh BHATIA (Virtual Film Festival videos) (Moderator, Leicester, United Kingdom)
16:00 - 16:04 Open approach: Dorsal (4 mins). Donald MC BRIDE (Consultant Orthopaedic Foot and Ankle Surgeon) (Speaker, Stoke on Trent, United Kingdom)
16:04 - 16:08 Open approach: Medial (4 mins). Jean-Luc BESSE (Praticien Hospitalier) (Speaker, Lyon, France)
16:10 - 16:14 Joint preparation: Flat cuts (4 mins). Oliver MICHELSSON (Consultant) (Speaker, Helsinki, Finland)
16:14 - 16:18 Joint preparation: Ball-cup reamers (4 mins). Daniele MARCOLLI (Foot and Ankle Surgeon) (Speaker, Milano, Italy)
16:18 - 16:22 Joint preparation: Step-cut (4 mins). Dimitrios HATZIEMMANUIL (Orthopaedic Surgeon) (Moderator, THessaloniki, Greece)
16:25 - 16:29 Implants: Plate and screws (4 mins). Xavier OLIVA MARTIN (Speaker, Barcelona, Spain)
16:29 - 16:33 Implants: Staples/crossed screws (4 mins). Elisabeth ELLINGSEN HUSEBYE (Speaker, Norway)
16:33 - 16:37 Postop (weightbearing/return to work-sport) (4 mins) . Alistair WILSON (Consultant) (Speaker, Belfast, United Kingdom)
16:37 - 17:00 Discussion.
AUDITORIUM
17:00

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
CB4
17:00 - 17:30

Coffee, Exhibition, and Poster Walks

17:05

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PWP10
17:05 - 17:25

Poster Walks presentations 10
Poster Walks presentations (3 mins each + 1 question from evaluators) of best scored posters:

Moderators: Paulo AMADO (Director of Orthopedic Departement) (Porto, Portugal), Alessio BERNASCONI (Foot and Ankle - Orthopaedic Surgeon) (Napoli, Italy), Dimitrios HATZIEMMANUIL (Orthopaedic Surgeon) (THessaloniki, Greece)
17:05 - 17:25 #42977 - PWP37 Benefits of circular external fixation in superconstruct reconstruction for challenging deformities: a prospective cohort study.
Benefits of circular external fixation in superconstruct reconstruction for challenging deformities: a prospective cohort study.

Introduction Unsatisfactory union of fusion sites is not uncommon following superconstruct fixation in challenge deformities. This study is to propose a new concept as the addition of circular external fixation to the conventional superconstruct for improving outcomes following the management of mentioned conditions at foot and ankle. Methods We prospectively introduce the circular external fixation to augment the internal fixation for the reconstruction of ankle-hindfoot, and forefoot-midfoot deformities in several conditions such as Charcot neuroarthropathy and severe equinocavovarus, etc. We divided all 24 patients who underwent corrective osteotomy and/or fusion into two groups as an advanced superconstruct group (combination of circular external fixation and internal fixation) and conventional superconstruct group (only internal fixation). The demographic characteristics were collected including union rate at 3-6 months postoperatively and union time of fusion. Results From the available data, union rates were 100% and 58.3% in advanced and conventional groups, respectively (p-value>0.05). Times to acceptable union were 69.3 and 107.4 days in advanced and conventional groups, respectively (p-value: 0.169). For the subgroup analysis in the Charcot neuroarthropathy patients (n=13), the union rate was also higher in the advanced group than the conventional group. For the non-Charcot patients (n=11), it seemed that there was no remarkable difference of union rates between the two groups. Discussion and Conclusion Advanced superconstruct using the addition of circular external fixation to the conventional fixation seems to provide additional benefits to increase union rate and reduce union time in the foot and ankle deformity corrections, especially in Charcot neuroarthropathy patients.
Angthong CHAYANIN (Bangkok, Thailand)
17:05 - 17:25 #42983 - PWP38 Minimally invasive surgery versus arthroscopic surgery for the first tarsometatarsal arthrodesis: a randomized comparative study.
Minimally invasive surgery versus arthroscopic surgery for the first tarsometatarsal arthrodesis: a randomized comparative study.

Introduction Little is known about the different outcomes between the minimally invasive surgery (MIS) and arthroscopic surgery (AS) for the first tarsometatarsal (TMT) arthrodesis. This study was to compare the outcomes of this joint preparation for fusion regarding effectiveness and safety between MIS and AS in the cadaveric specimens. Methods: All 16 cadaveric feet were randomly divided into two groups as 8 feet for MIS (under fluoroscopic control) group and 8 feet for AS group. They were operated by the fellowship-trained foot and ankle orthopaedic surgeons. Following complete procedures, all feet were dissected and recorded for areas of joint preparation on metatarsal and medial cuneiform sides via photographs and the ImageJ program. The injury of adjacent structure was noted in each specimen. Results: Average areas of joint preparation on metatarsal and medial cuneiform sides were 130.92 and 119.65 mm2, respectively. Average areas of joint preparation on metatarsal sides were 162.13 and 99.72 mm2 in MIS and AS, respectively (P-value = 0.067). Average areas of joint preparation on medial cuneiform sides were 129.87 and 109.42 mm2 in the MIS and AS, respectively (P-value = 0.557). For safety profiles, rate of adjacent injury was insignificantly higher in MIS group (42.86%) than AS group (0%) (P-value = 0.192). All injuries were found at extensor hallucis longus tendon. Conclusions: There were no significant differences of the effectiveness and safety profiles between MIS and AS groups. However, MIS seemed to provide more effectiveness on joint surface preparation but higher risk to adjacent structure than AS.
Angthong CHAYANIN (Bangkok, Thailand)
17:05 - 17:25 #42994 - PWP39 Effects of Medial Displacement Calcaneal Osteotomy and Lateral Column Lengthening Osteotomy Variations on Foot Alignment in Patients with Progressive Collapsing Foot Deformity.
Effects of Medial Displacement Calcaneal Osteotomy and Lateral Column Lengthening Osteotomy Variations on Foot Alignment in Patients with Progressive Collapsing Foot Deformity.

Background: Progressive Collapsing Foot Deformity (PCFD) is a complex condition marked by collapse of the medial longitudinal arch, forefoot abduction, decreased talonavicular coverage, and hindfoot valgus alignment. This study aimed to assess changes in foot alignment using two surgical options: medial displacement calcaneal osteotomy (MDCO) and lateral column lengthening osteotomy (LCLO), as well as their combinations. Method: Weightbearing CT scans of six patients with stage I PCFD were converted into 3D models. For each patient, fifteen models were created: MDCO with 5mm,10mm and 15mm sliding, LCLO with 5mm,10mm and 15mm lengthening, and their combinations, totaling 90 models. Measurements were conducted using Mimics Innovation Suite (Materialise, Leuven, Belgium) software. Results: We evaluated talonavicular coverage, Meary’s angle, calcaneal pitch, talocalcaneal angle, talar-first metatarsal angle, and tibiocalcaneal angle across different osteotomy types and correction amounts. LCLO more effectively increased talonavicular coverage, while MDCO better corrected calcaneal valgus. Minor deformities required less adjustment, whereas severe deformities benefitted from greater adjustments and the combination of both osteotomies proved more effective in such cases. Conclusion: Deformities should be individually assessed, with surgical technique decisions tailored to each patient to avoid over- or under-correction. Preoperative 3D modeling can enhance surgical precision, providing critical data for osteotomy planning. This study supports the use of 3D models for precise surgical planning in treating PCFD, offering valuable reference values.
Ece DAVUTLUOGLU (istanbul, Turkey), Mete OZER, Yahya DENIZ, Soheil ASHKANI-ESFAHANI, Christopher DIGIOVANNI, Bedri KARAISMAILOGLU
17:05 - 17:25 #43093 - PWP40 Redefining hallux rigidus classification through an objective hounsfield unit algorithm via weightbearing computed tomography.
Redefining hallux rigidus classification through an objective hounsfield unit algorithm via weightbearing computed tomography.

Introduction/Purpose: Hallux Rigidus (HR) is one of the most common conditions affecting the 1st metatarsophalangeal (MTP) joint. While the current Coughlin and Shurnas’ classification system is a more quantitative approach to diagnosing HR, 2D radiographic staging remains subjective. Weightbearing Computed Tomography (WBCT) may offer a more objective understanding of HR’s 3D pathology. The purpose of this study was to compare the Coughlin and Shurnas’ system with a novel WBCT based approach of classifying HR. Methods: WBCT scans of 31 cases of HR and 10 healthy controls were compared retrospectively to their Coughlin and Shurnas’ classification. Computational analysis using Hounsfield units [HU]) profiles was performed along five lines (central, inferolateral, inferomedial, superolateral, superomedial) within a volume of interest perpendicular to the 1st metatarsal head. HU distribution and joint space width (JSW) were calculated. Results: Average JSW was 1.28 mm for controls and 1.23 mm for HR group (p < 0.05). There was an increase in JSW from control (stage 0) to stage 1, a decrease from stage 1 to 2, and stage 3 consistently had the lowest JSW (p < 0.0001). The superomedial aspect of the joint had the most significant decrease in JSW (p < 0.05). Our model was most accurate in predicting stage 1 and 3 HR. For a JSW >=2.02 mm, there was an 89.4% probability the case was stage 1. JSW<1.09mm was more likely to be stage 2 or 3. Conclusion: In this study, we describe a novel quantitative approach to understanding and predicting HR deformity.
Emily LUO (Durham, NC, USA), Erik HUANUCO CASAS, Tommaso FORIN VALVECCHI, Hannah STEBRAL, Grayson TALASKI, Antoine ACKER, Kepler CARVALHO, James NUNLEY, Cesar DE CESAR NETTO
17:30

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
PS3
17:30 - 18:40

PLENARY SESSION 3
AOFAS at EFAS – Functional Hallux Limitus/Rigidus

17:30 - 18:40 Moderators. Kristian BUEDTS (Md) (Moderator, Brussels, Belgium), Michael ARONOW (not applicable) (Moderator, West Hartford, CT, USA, USA)
17:30 - 17:40 Pathomechanics. Manuel MONTEAGUDO (CONSULTANT ORTHOPAEDIC SURGEON) (Speaker, Madrid, Spain)
17:40 - 17:50 Joint preserving surgery. Michael ARONOW (not applicable) (Speaker, West Hartford, CT, USA, USA)
17:50 - 18:00 Arthrodesis. Kristian BUEDTS (Md) (Speaker, Brussels, Belgium)
18:00 - 18:10 Arthroplasty/resurfacing (Cartiva). David THORDARSON (Speaker, USA)
18:10 - 18:20 Hallux rigidus in the young athlete – US Speaker. Eric GIZA (Speaker, USA)
18:20 - 18:40 Discussion.
AUDITORIUM
18:45

"Friday 18 October"

Added to your list of favorites
Deleted from your list of favorites
CD1
18:45 - 18:50

Adjourn
with prizes for the best oral presentation and best poster

AUDITORIUM
Saturday 19 October
09:00

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
PS4
09:00 - 10:15

PLENARY SESSION 4: Difficult Scenarios in the Adolescent

09:00 - 10:15 Moderators. Senthil KUMAR (Consultant Orthopaedic Surgeon) (Moderator, Glasgow, United Kingdom), Barbara PICLET (chirurgien) (Moderator, Marseille, France)
09:00 - 09:10 Hallux valgus in patient with generalized laxity. Geoffroy VANDEPUTTE (MD) (Speaker, Lier, Belgium)
09:10 - 09:20 Residual cavovarus after clubfoot. Johannes HAMEL (Speaker, Germany)
09:20 - 09:30 Equinus gait and metatarsalgia. Stephan WIRTH (Head of foot and ankle surgery) (Speaker, Zürich, Switzerland)
09:30 - 09:40 Symptomatic Frieberg’s disease. Hans-Jörg TRNKA (Director) (Speaker, Vienna, Austria)
09:40 - 09:50 Painful flatfoot collapse with talocalcaneal bony coalition. Christina STUKENBORG-COLSMAN (XXX) (Speaker, Hannover, Germany)
09:50 - 10:15 Discussion.
AUDITORIUM
10:15

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
CB5
10:15 - 10:45

Coffee Break, Exhibition and Poster Walks

10:45

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
BFAS
10:45 - 12:00

BFAS FORUM:
Insertional tendinitis, conservative & operative treatment

10:45 - 12:00 Moderators. Kristian BUEDTS (Md) (Moderator, Brussels, Belgium), Giovanni MATRICALI (professor in orthopaedic surgery) (Moderator, Leuven, Belgium)
10:45 - 10:55 Achilles tendon: debride or osteotomy? Laurent GOUBAU (Foot and Ankle Surgeon) (Speaker, Ghent and Brussels, Belgium)
10:55 - 11:05 Accessory Navicular bone: remove or fix? Kristian BUEDTS (Md) (Speaker, Brussels, Belgium)
11:05 - 11:15 Plantar fascia : including lateral band. Geoffroy VANDEPUTTE (MD) (Speaker, Lier, Belgium)
11:15 - 11:25 Peroneus brevis tendon. Stefan CLOCKAERTS (Foot and ankle Surgeon) (Speaker, Mechelen, Belgium)
11:25 - 11:35 Anterior tibial tendon. Laurens DE COCK (Md) (Speaker, Dendermonde, Belgium)
11:35 - 12:00 Discussion.
AUDITORIUM

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
AWARD
10:45 - 12:00

EFAS Award/Fellowships presentations

10:45 - 12:00 Moderators. Nuno CORTE REAL (Clinical Director) (Moderator, Cascais, Portugal), Victor VALDERRABANO (Chairman) (Moderator, Basel, Switzerland)
10:45 - 10:51 EFAS Research Grant for "Foot & Ankle Arthrosis".
10:51 - 10:57 EFAS Research Grant for "Foot & Ankle Disorders".
10:57 - 11:03 EFAS Best Paper Award.
11:03 - 11:09 EFAS Best Poster Award.
11:09 - 11:15 EFAS Best Oral Presentation.
11:15 - 11:21 EFAS Travelling Fellowship Route1.
11:21 - 11:28 EFAS Travelling Fellowship Route2.
11:28 - 11:34 EFAS Research Fellowship.
11:34 - 11:40 EFAS-AOFAS Exchange Program - EFAS Group.
11:40 - 11:46 EFAS-AOFAS Exchange Program - AOFAS Group.
11:46 - 11:52 IFFAS Conference Travelling Award.
11:52 - 11:58 IFFAS Best Case Paper.
11:58 - 12:00 Q&A Discussion.
STUDIO
12:05

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
SY3
12:05 - 13:25

SYMPOSIUM: Imaging of the foot and ankle

12:05 - 13:25 Moderators. Donald MC BRIDE (Consultant Orthopaedic Foot and Ankle Surgeon) (Moderator, Stoke on Trent, United Kingdom), Aleksas MAKULAVICIUS (Team leader) (Moderator, Vilnius, Lithuania)
12:05 - 12:15 Weightbearing x-rays – importance and technique. Peter BOCK (Speaker, Vienna, Austria)
12:15 - 12:25 How ultrasound imaging changed my practice? Roman TOTKOVIČ (chief) (Speaker, košice, Slovakia)
12:25 - 12:35 MRI – false positives and negatives. Emre BACA (assoc. prof) (Speaker, istanbul, Turkey)
12:35 - 12:45 Weightbearing CT – indications and clinical research. Martinus RICHTER (Director) (Speaker, Rummelsberg, Germany)
12:45 - 12:55 SPECT-CT – trending topic and why? Matthew WELCK (Efas youth committee) (Speaker, london, United Kingdom)
12:55 - 13:25 Discussion.
AUDITORIUM

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
F4
12:05 - 13:00

Diabetic Foot and Ankle FORUM:

12:05 - 13:00 Moderator. Armin KOLLER (Lead Diabetic Foot Surgeon) (Moderator, Rheine, Germany), Manfred THOMAS (Head of department) (Moderator, Augsburg, Germany)
12:05 - 12:15 The role of the foot surgeon in diabetic foot care. Armin KOLLER (Lead Diabetic Foot Surgeon) (Speaker, Rheine, Germany)
12:15 - 12:25 Special features and pitfalls in diabetic foot surgery. Wilbert VAN LAAR (Orthopedic Surgeon) (Speaker, Leiden, The Netherlands)
12:25 - 12:35 Does the surgeon really know the Charcot Foot? Alexander WEE
12:35 - 12:45 Orthotic off-loading for ulcerated or neuroarthropathic feet. Fredrik NILSEN (Consultant) (Speaker, Sarpsborg, Norway)
12:45 - 13:00 Discussion.
STUDIO
13:05

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
HC
13:05 - 13:25

EFAS Humanitarian Committee: presentation

Moderators: Rick BROWN (Clinical lead) (Moderator, Oxford, United Kingdom), Manuel SOUSA (Foot and Ankle Surgeon) (Moderator, Lisbon, Portugal)
13:05 - 13:25 Discussion.
STUDIO
13:30

"Saturday 19 October"

Added to your list of favorites
Deleted from your list of favorites
CC2
13:30 - 13:45

CLOSING CEREMONY

13:30 - 13:45 Moderators. Kristian BUEDTS (Md) (Moderator, Brussels, Belgium), Manfred THOMAS (Head of department) (Moderator, Augsburg, Germany), Manuel MONTEAGUDO (CONSULTANT ORTHOPAEDIC SURGEON) (Moderator, Madrid, Spain)
AUDITORIUM
00:00
Added to your list of favorites
Deleted from your list of favorites
EPOSTERS1
00:00 - 00:00

EPOSTERS DISPLAYED - ANKLE

00:00 - 00:00 #40834 - PO01 Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate in chondral defects at the ankle as part of a complex surgical Approach - 5-year followup.
PO01 Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate in chondral defects at the ankle as part of a complex surgical Approach - 5-year followup.

Introduction/ Purpose The aim of the study was to assess 5-year-follow-up (5FU) after Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate (AMIC+PBC) in chondral lesions at the ankle as part of a complex surgical approach. Methods In a prospective consecutive non-controlled clinical follow-up study, all patients with chondral lesion at the ankle treated with AMIC+PBC from July 17, 2016 to May 31, 2017 were included. Size and location of the chondral lesions, the Visual-Analogue-Scale Foot and Ankle (VAS FA) and the EFAS Score before treatment and at 5FU were analysed and compared with previous 2-year-follow-up (2FU). Peripheral Blood Concentrate (PBC) was used to impregnate a collagen I/III matrix (Chondro-Gide, Wolhusen, Switzerland) that was fixed into the chondral lesion with fibrin glue. Results One hundred and twenty-nine patients with 136 chondral lesions were included in in the study. The chondral lesions were located as follows (n (%)), medial talar shoulder only, 62 (46); lateral talar shoulder only, 42 (31); medial and lateral talar shoulder, 7 (10); tibia, 18 (13). The average for lesion size was 1.8 cm2, for VAS FA 45.7 and for EFAS Score 9.8. 2FU/5FU was completed in 105 (81%)/104(81%) patients with 112/111 previous chondral lesions. VAS FA improved to 79.8/84.2 and EFAS Score to 20.3/21.5 (2FU/5FU). No parameter significantly differed 2FU and 5FU. Conclusion AMIC+PBC as part of a complex surgical approach led to improved and high validated outcome scores at 2FU/5FU. 2FU and 5FU did not differ.
Martinus RICHTER (Rummelsberg, Germany), Stefan ZECH, Issam NAEF, Stefan A MEISSNER
00:00 - 00:00 #40845 - PO02 Risk Factors for Postoperative Re-sprain following Suture Tape Implantation for Anterior Talofibular Ligament Insufficiency.
PO02 Risk Factors for Postoperative Re-sprain following Suture Tape Implantation for Anterior Talofibular Ligament Insufficiency.

Background: Anterior talofibular ligament (ATFL) insufficiency encompasses situations in which (i) frequent sprains cause ATFL loss, as evidenced by ATFL non-visualization on preoperative magnetic resonance imaging, or (ii) minimal healthy ATFL tissue for repair is left after the removal of the large os subfibulare. Suture tape implantation (STI) can be indicated for these cases rather than conventional ligament repair. To investigate the incidence of postoperative re-sprain in patients who underwent STI for ATFL insufficiency and to identify risk factors influencing the occurrence of postoperative re-sprain. Methods: A total of 68 patients who underwent STI for ATFL insufficiency from January 2016 and December 2021 were retrospectively evaluated. The minimum follow-up duration for inclusion was 2 years after surgery. All included patients were divided into two groups according to the presence of postoperative re-sprain during the follow-up period. Multiple clinicoradiographic parameters were measured, and binary logistic regression analysis was performed to determine the factors influencing postoperative re-sprain. Results: Postoperative re-sprain occurred in 27.9% of the 68 patients, and multiple re-sprains persisted in 10.3%. Postoperative re-sprain was more likely to occur in patients who smoked after surgery (odds ratio [OR], 3.510), had generalized ligament laxity (OR, 4.364), and engaged in occupations requiring high physical activity levels (OR, 4.421), including soldiers, professional athletes, athletic students, and postmen. Conclusion: After STI for ATFL insufficiency, extra caution is warranted in patients with risk factors, necessitating meticulous attention to their care.
Jun Young CHOI (Seoul, Republic of Korea), Jin Soo SUH, Kim MIN JIN
00:00 - 00:00 #40846 - PO03 Posterior ankle arthroscopy should be selectively performed for osteochondral lesions on the posteromedial talar dome: A review of arthroscopic videos.
PO03 Posterior ankle arthroscopy should be selectively performed for osteochondral lesions on the posteromedial talar dome: A review of arthroscopic videos.

Background: We investigated whether arthroscopic treatment of posteromedial OLTs can be accomplished solely through anterior ankle arthroscopy. We hypothesized that specific conditions may prompt posterior ankle arthroscopy. Methods: We retrospectively reviewed videos of patients who underwent primary arthroscopic microfractures for OLTs on the posteromedial talar dome between 2010 and 2021. We focused on whether visualization of the posteromedial OLT was adequate through the anteromedial or anterolateral portal in the anterior ankle arthroscopy group (posteromedial or posterolateral portal in the posterior ankle arthroscopy group). We assessed whether a sufficient microfracture technique was feasible during surgery. Results: Seventy-nine patients were included in this study, among which 62 and 17 were assigned to the anterior and posterior ankle arthroscopy groups, respectively. Posteromedial OLTs were fully observed through the anteromedial portal in 79.0% of cases and better observed through the anterolateral portal (93.5%). Only four patients (6.5%) showed limited visualization and underwent an insufficient microfracture procedure. In two of these patients, we observed challenges in advancing the arthroscope and other devices owing to the narrow joint space even with sufficient distraction, whereas the remaining two showed infeasibilities derived from far posterior locations. In contrast, microfractures via posterior ankle arthroscopy were successfully performed in all patients (100%). Conclusions: When surgically treating patients with posteromedial OLTs, we recommend considering anterior ankle arthroscopy unless a combined pathology requires surgical intervention for the posterior ankle. Posterior ankle arthroscopy should be selectively utilized only for far posteromedial OLTs or in patients with narrow joint space, even with sufficient distraction.
Jun Young CHOI (Seoul, Republic of Korea), Jin Soo SUH, Kim MIN JIN
00:00 - 00:00 #40854 - PO04 The Clinical Outcome Comparison Between Trans-Syndesmotic Fixation and Deltoid Ligament Repair in Unstable Ankle Fractures with Medial Clear Space Widening: A Systematic Review and Meta-analysis.
PO04 The Clinical Outcome Comparison Between Trans-Syndesmotic Fixation and Deltoid Ligament Repair in Unstable Ankle Fractures with Medial Clear Space Widening: A Systematic Review and Meta-analysis.

Background: Due to the variability in evidence supporting either trans-syndesmosis fixation or deltoid ligament repair in unstable ankle fractures with medical clear space (MCS) widening makes it unclear which surgical technique leads to the best patient outcomes. The goal of our systematic review and meta-analysis was to compare clinical outcomes of trans-syndesmotic fixation versus anatomic deltoid ligament repair in the management of unstable ankle fractures with MCS widening. Methods: Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were utilized in this study. A comprehensive and systematic search was conducted using the PubMed, Embase, Web of Science and Cochrane Library databases. Outcomes investigated in this review included the rates of syndesmotic malreduction, removal of hardware, postoperative complications including wound issues, and functional/pain scores. Results: A total of five studies were selected in this review, with 280 unstable ankle fractures with MCS widening: 165 for the trans-syndesmotic fixation group and 115 for the anatomic deltoid ligament repair group. Compared to the trans-syndesmosis fixation group, the deltoid repair group showed significant lower rates of syndesmotic malreduction rates and removal of hardware: 6.5% (4/61) Vs. 27% (16/59) (RR=0.26, 95% CI=[0.10, 0.68]), and 2.6% (3/115) Vs.54.5% (90/165) (RR=0.06, CI=[0.02, 0.14]), respectively. No significant differences were found between the two groups in postoperative wound complications, reoperations, and functional scores including AOFAS and VAS pain score. Conclusions: Based on our findings, anatomic deltoid ligament repair may be more suitable for addressing MCS widening in the management of unstable ankle fractures compared to trans-syndesmosis fixation.
Oliver SOGARD, John MCDONALD, Michael ELDER WATERS, Wonyong LEE (Sayre, PA, USA, USA)
00:00 - 00:00 #40855 - PO05 The Impact of Timing in Ankle Fracture Fixation on Postoperative Wound Complications: A Critical 24-Hour Cutoff Point Explored through Systematic Review and Meta-Analysis.
PO05 The Impact of Timing in Ankle Fracture Fixation on Postoperative Wound Complications: A Critical 24-Hour Cutoff Point Explored through Systematic Review and Meta-Analysis.

Introduction This systematic review and meta-analysis aims to examine the effect of surgical timing on postoperative wound complications, specifically investigating the significance of a 24-hour cutoff point. Methods This literature review was conducted in adherence to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines utilizing databases including PubMed, Embase, Web of Science, and the Cochrane Library, carried out on January 30, 2024. The inclusion criteria for studies were as follows: (1)Research comparing clinical outcomes following surgical fixation for ankle fractures between early and delayed fixation groups, specifically using a 24-hour cutoff point, and (2)Reports of at least one of the following outcomes: postoperative wound complications: superficial/deep infection, length of stay in the hospital, and fixation failure. Exclusion criteria were patients with open fractures, polytrauma, pilon fractures, physeal fractures, or fractures of the talus/calcaneus, and those initially treated with an external fixator. Results Eight studies with 1183 patients were included in our review. Early fixation was performed for 572 patients while delayed fixation for 611 patients. Compared to the delayed fixation group, the early fixation group showed a significant lower postoperative wound complication rate: 4.4% (23/525) Vs. 10.5% (60/571) (RR=0.37, 95% CI=[0.22, 0.60]), and a significant shorter length of stay in the hospital: standardized mean difference (SMD)=-1.28, CI=[-2.09, -0.47]), respectively. Conclusion Based on our results, early surgical intervention within the first 24 hours should be considered to mitigate the risk of postoperative wound complications and shorten the length of stay in in management of ankle fractures.
Wonyong LEE (Sayre, PA, USA, USA), John MCDONALD, Shaya SHAHSAVARANI, Alexander EDELSTEIN
00:00 - 00:00 #40876 - PO06 Fixed-bearing versus mobile-bearing total ankle replacement survivorship. A meta-analysis.
PO06 Fixed-bearing versus mobile-bearing total ankle replacement survivorship. A meta-analysis.

Background: Main objective of this research is to know if there is a different survival rate between fixed bearing (FB) and mobile bearing (MB) total ankle replacement (TAR). Methods: A systematic search was performed in PubMed, Cochrane, EMBASE and ClinicalTrials.gov databases to identify published studies from August 2018 to September 2022 including results for FB and MB TAR survivorship. Inclusion criteria included 1) primary TAR in one or both feet in which implant could be identified, 2) a minimum of 20 procedures reported, 3) reported implant survivorship or calculable and 4) a minimum of 12 months follow-up for level 1–3 studies or 60 months for level 4 studies. Results: 3902 ankles in 28 studies were included. 719 were FB and 3104 MB with an overall survivorship of 94% (95% CI [0.89; 0.97]) and 89% (95% CI [0.86; 0.92]) respectively. After subgroup analysis, we did not find differences among both groups (p = 0.429). Meta-regression analysis showed that longer follow-up was associated with lower survival rates in MB group (p = 0.000) while no other relationships were found with other factors (age, level of evidence or conflict of interests). Conclusions: No differences in survival rates between both groups were found. Age and other studied confounders were not found to be related with implant survivorship. However, longer follow-up was found to be related with lower survival rates. Studies with longer follow-up and higher level of evidence are needed to confirm results.
González-Alonso MARCOS (León, Spain), Trapote Cubillas ANA R, Madera González FRANCISCO J, Hernández Fernández ÓSCAR, Sánchez Lázaro JAIME A.
00:00 - 00:00 #40882 - PO07 Supramalleolar osteotomy for malaligned total ankle replacement.
PO07 Supramalleolar osteotomy for malaligned total ankle replacement.

Background: Total ankle replacement (TAR) is an established method of treatment for end-stage ankle arthritis. TAR malalignment is a common cause of failure, either by increasing the risk of component loosening, cyst formation or polyethylene fracture. Methods: We present a case of a 57-year-old female patient who underwent TAR eight-years ago. The TAR was positioned in varus, although in a parallel position between the tibia and talar components. She developed increasing pain along her medial ankle, with no response to conservative treatment. Standing weightbearing anteroposterior, lateral and Saltzmann views, as well as CT-scan, demonstrated the TAR varus position but with adequate interface between TAR components and bone, without any signs of polyethylene wear or bone cysts. We decided to perform a lateral closing wedge supramalleolar osteotomy combined with a lateral malleolus osteotomy, in order to realign the TAR. Results: At 24-month follow-up, the Visual Analog Scale for pain (VAS-Pain) decreased from 8 (preoperatively) to 0. The Foot and Ankle Outcome Score (FAOS) increased from 12% (preoperatively) to 96%. The patient is very satisfied with the result, as she kept mobility of her ankle and avoided complex TAR revision or ankle fusion. Radiographic assessment demonstrates a normally aligned TAR with complete union of the osteotomies. There was no postoperative complications, including wound problems, hardware related issues or neurovascular injuries. Conclusion: This report illustrates how supramalleolar osteotomy is a valid option for malaligned TAR, avoiding complex TAR revision or conversion to ankle fusion, relieving symptoms and improving midterm clinical scores.
Daniel SARAIVA (Oporto, Portugal), Daniel FREITAS, Rodrigues ANDRÉ, Marco SOUSA, Pato TIAGO, José TULHA
00:00 - 00:00 #40886 - PO08 Analysis of Pre- and Postoperative Magnetic Resonance Imaging (MRI) and Functional status in Anterior Talofibular Ligament Injury Managed with Arthroscopic Modified Broström Procedure augmented with internal bracing.
PO08 Analysis of Pre- and Postoperative Magnetic Resonance Imaging (MRI) and Functional status in Anterior Talofibular Ligament Injury Managed with Arthroscopic Modified Broström Procedure augmented with internal bracing.

Introduction Magnetic Resonance Imaging (MRI) stands out as a potent tool for assessing ATFL (Anterior Talofibular Ligament) injuries, providing insights into the state of lateral ankle ligaments and associated pathology. Ligament intensity exhibits a robust negative linear correlation with material biomechanical strength properties. To address ATFL injuries, the arthroscopic modified Broström procedure with internal bracing has gained popularity, offering a swifter return to daily activities. Method We prospectively enrolled 100 patients diagnosed with ATFL injuries and performed arthroscopic modified Broström procedures with internal bracing. Pre-operative and 6-month post-operative MRIs of the injured ankle were obtained. AOFAS scores were recorded 1st, 2nd, and 4th months postoperatively. The ATFL morphology was categorized into four groups: Increased intensity, wavy-shaped, discontinuity, and non-visualization. Result The mean preoperative AOFAS score was 81.4. At the 2-month and 4-month follow-up, the mean AOFAS scores improved to 96.3 and 98, respectively. The 6-month post-operative MRI revealed a solid linear band crossing from the talus to the fibular insertion for each repaired ATFL. Notably, 76 out of 98 ankles (78%) exhibited low signal intensity of the ligament. The rate of low signal intensity on postoperative MRI was significantly lower in those with discontinuous or nonvisualised quality on preoperative MRI (50.0%) compared to the wavy/enhanced intensity group (84.6%). Discussion and conclusions Regardless of the pre-operative ATFL morphology, the arthroscopic modified Broström procedure with internal bracing yields favorable functional outcomes and restores the morphological integrity of the ATFL.
Tsungyu LAN (New Taipei City, Taiwan)
00:00 - 00:00 #40915 - PO09 Demographic Disparities in 30-Day Outcomes Following Achilles Tendon Repair.
PO09 Demographic Disparities in 30-Day Outcomes Following Achilles Tendon Repair.

INTRODUCTION: Specific risk factors for Achilles tendon repair complications such as tobacco use and diabetes have been well-reviewed in current literature. However, the impact of demographic disparities such as race and gender on the 30-day postoperative complication of an Achilles tendon repair has not been extensively reported. Accordingly, we sought to investigate whether demographic disparities in 30-day postoperative Achilles repair outcomes exist and to what extent. METHODS: The American College of Surgeons National Surgical Quality Improvement Program Database was queried for patients undergoing repair of Achilles tendon rupture from 2012 to 2021. A multivariate logistic regression was conducted for each complication to evaluate whether demographic factors were associated with complications after adjusting for various variables (age, obesity rate, diabetic/nondiabetic, smoker/nonsmoker, ASA class). Medical complications included deep vein thrombosis (DVT), superficial surgical site infection (SSI), deep SSI (dSSI), wound disruption after surgery/dehiscence, readmission rate and reoperation rate. RESULTS: A total of 6333 patients who underwent Achilles tendon were included in the study, 25% (N=1607) were women, 49.0% (N=3101) reported as White, 21.1% (N=1336) as Black/African American and 29.9% (N=1896) as Other. Following a multivariate analysis, neither race or gender of the patient were associated with a difference in rates of any evaluated complications. Only race demonstrated a significant difference in the rate of superficial SSI (χ2 = 7.21; p=.0272) following multivariate analysis. CONCLUSION: This study highlights advancements in the delivery of equitable care, but we recognize that there continues to be disparities in surgical care which requires strong and worthwhile solutions.
Dino FANFAN (Miami, USA), William RITTMEYER, Aditi KUMAR, Daniel MURRAY, Cary CHAPMAN
00:00 - 00:00 #40922 - PO10 Use of an MRI request protocol reduces inappropriate repeat foot and ankle MRI scans.
PO10 Use of an MRI request protocol reduces inappropriate repeat foot and ankle MRI scans.

Unnecessary repeat MRI scans are costly and do not advance patient care. Our objective was to analyse the frequency of inappropriate repeat MRI Scans and assess the impact of introducing a protocol for repeat MRI requests. This was a retrospective audit of 1322 MRI scans performed in our foot and ankle unit between 01/10/2019-31/10/2022. Repeat MRI was defined as any scan within 3 years of MRI on the same area of the body. For all scans we investigated the clinical appropriateness and the impact of scan on patient management. Scans were deemed appropriate if they were part of a clinical trial, for tumour/infection/stress-fracture monitoring, for new trauma, pre-operative planning, following agreement in MDT or following changes in clinical symptoms. The initial audit demonstrated high rates of inappropriate MRI scans. Therefore, a protocol was introduced and re-audited over 6 months. In the initial audit 45% of repeat MRI scans were inappropriate. Following introduction of the protocol, inappropriate scans fell from 45% to 12% (p=0.001). No inappropriate scans influenced patient management in either cycle. The scans deemed appropriate by the protocol influenced patient management in 68% in the initial audit and 77% in the re-audit (p=0.48). The average time between scans increased from 13.1 months, to 21.1 months in the re-audit. The initial audit demonstrated that inappropriate repeat MRI scans were common and seldom impacted patient management. The MRI protocol significantly reduced the number of inappropriate MRI scans. Furthermore, this reduced the burden on radiology services and resulted in financial savings.
Beer ALEXANDER (London, United Kingdom), Amir ARDAKANI, Patel SHELAIN, Cullen NICHOLAS, Welck MATTHEW, Malhotra KARAN
00:00 - 00:00 #40951 - PO11 Using sense of vibration to evaluate proprioception to ankle sprain.
PO11 Using sense of vibration to evaluate proprioception to ankle sprain.

Objective:This study aims to investigate changes in vibration sensations in patients who develop ATFL rupture following acute ankle sprain, examining the usability of proprioceptive measurement methods and exploring their place in diagnosis. Materials and Methods:Osseous pathologies were ruled out and rupture diagnosis was then determined by ultrasound examination. Subsequently, vibration measurements were performed on both ankle ATFL traces using a 128 Hz tuning fork. Data were compared with a healthy population and a group of patients with ankle lateral edema following acute sprain without rupture. Results:Included in this study were 81 participants, with 48 males and 33 females.Among the 27 patients with ATFL rupture, additional CFL injuries were present in 9 cases and additional PTFL injuries (Grade 2-3 ) were present in 5 cases. The mean duration of tuning fork-assisted vibration on the injured side for patients with ATFL rupture was 5,72 second while on the healthy side it was 7,87 second. This difference was statistically significant (p=0.001).The average vibration duration for these cases at the 12th week was found to be 7,65 second which was statistically significant (p=0.001). The rate of chronic instability was 25.9% (n:7) Conclusion:After an acute ATFL rupture, the impaired proprioception also affects the vibration sense of the individuals, resulting in decreased vibration duration in the damaged tendon. Improved proprioception was demonstrated through vibration measurements,indicating the restoration of vibration sense.The tuning fork-assisted vibration measurement technique appears to be usable as a proprioceptive measurement method and can be employed as an adjunct method for diagnosis
Emre BACA (istanbul, Turkey), Muhammed Can ARI
00:00 - 00:00 #41101 - PO12 Outcomes of Platelet-Rich Plasma Infiltration and Weightbearing Cast Immobilization in Distal Tibialis Anterior Tendinopathy: A Prospective Cohort Study.
PO12 Outcomes of Platelet-Rich Plasma Infiltration and Weightbearing Cast Immobilization in Distal Tibialis Anterior Tendinopathy: A Prospective Cohort Study.

Background - Distal tibialis anterior tendinopathy (DTAT) is a chronic condition that may lead to functional impairment and secondary forefoot deformities when left untreated. Current clinical practice is guided by case reports and small retrospective case series; little consensus exists on which treatment protocol is most effective. This study aims to assess a conservative treatment consisting of PRP-infiltration and walking cast immobilization. Methods - This prospective study included 18 patients (18 feet), recruited between September 2020 and September 2022 at our institution. Ultrasonography was performed; leukocyte-poor PRP was infiltrated around the tibialis anterior tendon insertion. Walking cast immobilization was used for 3 weeks after infiltration, followed by eccentric exercises and gastrocnemius-soleus muscle complex stretching. Clinical findings, visual analog scale (VAS), Foot Function Index (FFI), and American Orthopaedic Foot & Ankle Society (AOFAS) midfoot scores were recorded at inclusion, 6 and 12 weeks after PRP-infiltration. One-way repeated measures ANOVA was performed over time for FFI, AOFAS, and VAS scores. Results - Tendon thickening and hypoechogenicity were most commonly reported in ultrasonography. Significant improvement from baseline VAS (VASrest: 4.71±2.7, VASactivity: 5.66±2.5) to 12 weeks follow-up (VASrest: 2.14±2.7, VASactivity: 3.34±2.5) was found. AOFAS and FFITotal improved significantly from baseline (AOFAS: 66.9±3.3, FFITotal: 32.9±3.3) to 6-week follow-up (AOFAS6w: 79.4±3.3, P =.019; FFITotal: 19.4±3.3, P =.011). No statistically significant further improvement was found from 6 to 12 weeks’ follow-up. Two patients chose operative treatment because of persisting symptoms. Conclusion - We found that PRP-infiltration with walking cast immobilization was associated with general early symptom improvement.
Lies DESOMER (Basel, Switzerland), Nathalie VAN BEEK, Anne VAN RIET, Stefaan VERFAILLIE
00:00 - 00:00 #41131 - PO13 Patient Reported Outcomes with the Use of Fibular Nail Fixation, Retrospective Review of 40 Cases.
PO13 Patient Reported Outcomes with the Use of Fibular Nail Fixation, Retrospective Review of 40 Cases.

INTRODUCTION: We report our surgical and patient reported outcomes for a cohort of single surgeon consecutive fibula nails with proximal and distal locking fixation. METHODS: We retrospectively reviewed prospectively collected data on 41 patients that were implanted with Fibulock® Fibula Nail (Arthrex, Naples, Florida, USA). Intraoperative reduction quality was noted and patients were followed postoperatively with radiographs assessing maintenance of reduction, healing, and complications. Patient reported outcome questionnaires were collected preoperatively and then again at 3, 6, 12, and 24 months postoperatively. The Foot and Ankle Ability Measure (FAAM) assessed the patient’s functional status, The Visual Analogue Scale (VAS) was used to evaluate pain. RESULTS: All 41 patients had approximately one year of postoperative follow-up and some patients up to two years of follow-up (14.68 months ± 5.92). There were 25 females and 16 males. The average age at the time of surgery was 47.17 years (± 16.00) and the average BMI was 27.28 (± 6.10). Medical history is shown in figure 1. The type of facture pattern is tabulated in Figure 2. Statistical analysis revealed a significant difference between preoperative and postoperative FAAM scores overall (+67.52, p < 0.001), within ADL (+68.07, p <0.001), and sport (+65.95, p < 0.001). Also, there was a significant difference between preoperative VAS and postoperative VAS (-4.73, p < 0.001). DISCUSSION AND CONCLUSION: Our findings support the use of intramedullary fibula nails as a viable alternative to traditional plate and screw fixation, offering improved patient outcomes and fewer hardware-related complications.
Solangel RODRIGUEZ-MATERON, Dino FANFAN (Miami, USA), Nicholas DENOVE, Danae HOLLINGSWORTH, Paloma GAUTHIER, Christopher HODGKINS
00:00 - 00:00 #41132 - PO14 Retrospective Review of 200 Fibula Nails with Proximal and Distal Fixation.
PO14 Retrospective Review of 200 Fibula Nails with Proximal and Distal Fixation.

Background: Ankle fractures are a frequent injury in the adult population and a quarter of all ankle fractures are classified as unstable, requiring surgical intervention. Plate-and-screw construct is the traditionally used fixation method for fibula fractures. The use of an intramedullary nail is an alternative fixation method, with current literature supporting very low complication rates and hardware removal surgeries. The purpose of this study was to evaluate the outcomes, including complication rates and implant removal rates, using a fibula nail with both proximal and distal fixation capabilities by an experienced surgeon. Methods: We retrospectively reviewed 203 consecutive fibula nail cases from a single surgeon using a mini-open technique for anatomic reduction. Demographic, operative, clinical, and radiographic outcome data were analyzed, specifically examining complication rates and need for implant removal. Results: In total, 203 fractures were treated with a fibula nail and were included in our retrospective analysis. The average age was 47.3 years (range, 29-82) and the average body mass index was 28 (range, 22-34). All fractures healed. We identified 2 cases of superficial wound infection, 1 superficial peroneal nerve irritation, and 1 case of implant removal. 2 fractures were converted to a plate intraoperatively prior to a technique modification which has prevented this occurrence. No deep infection, delayed union, or nonunion occurred. Conclusion: Our data support that fibula nails with proximal and distal locking capabilities offer an alternative to plating with the potential for lower complication rates and lower need for implant removal.
Solangel RODRIGUEZ-MATERON, Dino FANFAN (Miami, USA), Nicholas DENOVE, Danae HOLLINGSWORTH, Paloma GAUTHIER, Christopher HODGKINS
00:00 - 00:00 #41166 - PO15 Clinical and functional results 5 years after arthroscopic tibiotalocalcaneal arthrodesis with retrograde nail.
PO15 Clinical and functional results 5 years after arthroscopic tibiotalocalcaneal arthrodesis with retrograde nail.

Introduction Arthroscopic tibiotalocalcaneal arthrodesis with retrograde nail is a minimally invasive technique which is performed in patients with osteoarthritis who do not improve with conservative treatment. The advantage of this technique is less hospital stay and lower complication rate compared to open techniques. Material and methods A retrospective descriptive study of 8 patients undergoing arthroscopic tibiotalocalcaneal arthrodesis by posterior approach between 2016-2023 with retrograde nail in our hospital. We analyzed functionality data measured with the American Orthopedic Foot and Ankle Scale (AOFAS), degree of satisfaction, consolidation time and rate, discharge time and main complications. Results An average hospital stay of 3.43±0.53 days was observed and patients had good functionality and low complication rate. We obtained 86% rate of tibiotalar consolidation in the period of 10 weeks and a rate of subtalar consolidation about 71% in 20 weeks. Patients were non-weight bearing for 4 weeks with a splint and then they were allowed partial-weight bearing with orthopedic boot until 10th postoperative week. We found main complications in two patients: one of those had to be reoperated due to complications in the surgical wound and the other one presented tibiotalar pseudoarthrosis although without clinical repercussion. Conclusion Arthroscopic panarthrodesis by posterior approach offers very good results with a high rate of bone consolidation, few complications and minimal non-weight bearing time. This technique could be used in patients without major deformities, especially in those at high risk of complications of the surgical wound as diabetic foot because of the decrease in them observed.
Guillermo GARCÍA CRUZ, Omar Alfonso GUERRA ALVAREZ (SEGOVIA-SPAIN, Spain), Gonzalo GALVEZ MARQUEZ, Alvaro DE LA RUBIA MARCOS, Jose Manuel RUIZ ANDREU ORTEGA, Jose Alberto RODRIGO VERGUIZAS
00:00 - 00:00 #41235 - PO16 Comparative Outcomes of Trans-fibular Total Ankle Arthroplasty in Rheumatoid Arthritis and Osteoarthritis.
PO16 Comparative Outcomes of Trans-fibular Total Ankle Arthroplasty in Rheumatoid Arthritis and Osteoarthritis.

Introduction: Trans-fibular total ankle arthroplasty (TAA) has demonstrated promising outcomes in recent studies. However, comparative data on the performance of Trans-fibular TAA in patients with rheumatoid arthritis (RA) versus osteoarthritis (OA) are lacking. This study aims to compare the therapeutic outcomes of Trans-fibular TAA in RA and OA populations. Patients and Methods: We conducted a retrospective cohort study at our institute, evaluating patients who underwent Trans-fibular TAA from January 2019 to April 2022. The study included 46 ankles, with 29 from RA patients and 17 from OA patients. Outcome measures utilized included the Self-Administered Foot Evaluation Questionnaire (SAFE-Q), a patient-reported outcome tool, and the Japanese Society for Surgery of the Foot (JSSF) scale, comparing preoperative scores with those at 3, 6, 12, and 24 months postoperatively. Additionally, both the SAFE-Q and JSSF scores were directly compared between the RA and OA groups at each time point. Complication rates were also documented and analyzed. Results: Improvements in all SAFE-Q subscales and the JSSF scale were significant at 3 or 6 months post-operation, and these improvements were maintained up to 2 years in both groups. Comparative analysis revealed significantly higher scores in the OA group in the 'Physical function' and 'Shoe-related' subscales of SAFE-Q at the 2-year postoperatively. Complications included malleolar fractures (OA: 3, RA: 2) and infections (deep: OA: 1, RA: 1; superficial: RA: 2). Conclusion: Both groups showed good clinical outcomes up to 2 years post-operation, with the OA group performing better in some patient-reported outcomes.
Koichiro YANO (Tokyo, Japan), Katsunori IKARI, Ken OKAZAKI
00:00 - 00:00 #41613 - PO17 Short course of intravenous corticosteroids does not reduce swelling and soft tissue damage for trimalleolar ‎ankle fractures.‎.
PO17 Short course of intravenous corticosteroids does not reduce swelling and soft tissue damage for trimalleolar ‎ankle fractures.‎.

Introduction. Our aim was to analyse whether a short course of corticosteroids is useful in reducing the ‎delay of ‎definitive surgery in trimalleolar ankle fractures.‎ Methods. We retrospectively analysed patients admitted between January 2020 ‎and ‎December 2022 for a trimalleolar ankle fracture. One group received methylprednisolone 1mg/kg ‎every 24 ‎hours for 3 days at the discretion of the admitting physician and the other did not. We excluded patients with ‎chronic corticosteroid ‎treatment, patients treated with external fixation as the definitive treatment and patients with associated lesions. ‎Delay to surgery and ‎postoperative complications during the first year were assessed.‎ Results. Of a total of 57 patients, 23 (40.4%) received methylprednisolone with a ‎mean ‎age of 55.35 years (±17.79) while the group that did not receive treatment was 57.38 years (±16.96). No ‎differences were found in the type of fractures between both groups (p=0.145) using ‎Lauge-Hansen ‎classification with PER4 fractures being the most frequent in both groups. There ‎were also no differences in ‎dislocations or subluxations on admission (p=0.483), open fractures (p=0.145), or the use of external fixation ‎‎(p=0.146). The mean delay to definitive surgery was 7.82 ‎days (±4.71) in the group that did not receive ‎corticosteroid and 7.57 days (±3.88) in the group that ‎did (p=0.829). Complications rate during the first year ‎of follow-up was similar in both ‎groups (p=0.874).‎ ‎ Conclusion. In our sample, methylprednisolone was not associated with a decrease in time to surgery, and it did ‎‎not appear to increase the risk of postoperative complications.‎
González-Alonso MARCOS (León, Spain), Trapote Cubillas ANA R, Madera González FRANCISCO J, Hernández Fernández ÓSCAR, Sánchez Lázaro JAIME A.
00:00 - 00:00 #42548 - PO18 Bone grafting for periprosthetic bone cysts following total ankle arthroplasty.
PO18 Bone grafting for periprosthetic bone cysts following total ankle arthroplasty.

Aims: The purpose of this study was to assess the success rate and functional outcomes of bone grafting for periprosthetic bone cysts following total ankle arthroplasty (TAA). Methods: We reviewed a total of 37 ankles that had undergone bone grafting for periprosthetic bone cysts. A CT scan was performed one year after bone grafting to check the status of graft incorporation. For functional outcomes, variables such as the Ankle Osteoarthritis Scale score and the visual analogue scale for pain were measured. Results: Out of 37 ankles, graft incorporation was successful in 30 cases. Among the remaining seven cases, four (10.8%) exhibited cyst re-progression, so secondary bone grafting was needed. After secondary bone grafting, four ankles did not show further progression, resulting in an overall 91.9% success rate(34 of 37) at a mean follow-up period of 47.5 months(24 to 120). The remaining three cases (8.1%) showed implant loosening, so tibiotalocalcaneal arthrodesis was performed. Functional outcomes were also improved after bone grafting in all variables at the latest follow-up(p<0.05). The mean incorporation rate of the grafts according to the location of the cysts was 84.8% at the medial malleolus, 65.1% at the tibia, and 81.2% at the talus. Smoking was identified as a significant predisposing factor adversely affecting graft incorporation(p=0.001). Conclusion: Bone grafting for periprosthetic bone cysts following primary TAA is a reliable procedure with a satisfactory success rate and functional outcomes. Regular follow-up, including CT scan, is important for the detection of cyst re-progression to prevent implant loosening after bone grafting.
Gun-Woo LEE (Gwangju, Republic of Korea), Min-Su LEE, Keun-Bae LEE
00:00 - 00:00 #42559 - PO19 Extensor digitorum longus repair augmented with peronial tertius autograft (late complication of anterior ankle arthroscopy).
PO19 Extensor digitorum longus repair augmented with peronial tertius autograft (late complication of anterior ankle arthroscopy).

Introduction Anterior ankle arthroscopy is a common and safe procedure for ankle pathology, but is not free from complications like neurovascular injury, tendon rupture or infection. Material and Methods We present a case of an active 27 years old male patient who underwent anterior ankle arthroscopy due to anterior ankle impingement. Two months after surgery, he felt a sudden snap directly over the anterior ankle joint, with immediate pain and inabilty to extend the lesser toes. Subsequent dynamic ultrasonography demonstrated an extensor digitorum longus tendon high-grade rupture. Results We decided for an anterior ankle open approach, and after extensor digitorum longus complete rupture confirmation, with a gap around one centimeter (with the ankle placed in a neutral position), performed direct suture of the tendon, augmenting it with a peronial tertius tendon autograft harvested from the same ankle. The three years follow-up demonstrates an asymptomatic patient, punctuating zero on the Visual Analog Score for Pain and 89/100 on the Foot and Ankle Outcome Score (FAOS). Discussion Extensor digitorum longus rupture is a rare complication of anterior ankle arthroscopy, and is commonly attributed to iatrogenic injury caused by the arthroscopic shaver blade or radiofrequency instruments. Diagnosis is based on clinical evaluation and can be confirmed by ultrasonography or magnetic resonance imaging. Conclusion Late rupture of extensor digitorum longus is a rare complication of anterior ankle arthroscopy. Timely diagnosis permits direct tendon repair, and augmenting this repair with a peronial tertius tendon autograft can lead to high patient satisfaction and functional status.
Daniel SARAIVA (Oporto, Portugal), Daniel FREITAS, Rodrigues ANDRÉ, Marco SOUSA, Pato TIAGO, José TULHA
00:00 - 00:00 #42576 - PO20 Prediction of Syndesmotic Instability according to the Lateral Malleolus Fracture Pattern in Supination-External Rotation Type Ankle Fractures.
PO20 Prediction of Syndesmotic Instability according to the Lateral Malleolus Fracture Pattern in Supination-External Rotation Type Ankle Fractures.

Purpose: This study examined whether preoperative radiological evaluations can predict syndesmotic instability according to the lateral malleolus fracture pattern in supination-external rotation-type ankle fractures. Materials and Methods: This study enrolled 132 patients (132 ankles) with supination-external rotation stage 3 and 4 ankle fractures. Three-dimensional computed tomography was used for the morphological classification of the lateral malleolus fractures. A long oblique fracture was defined when the posterior cortical bone height of the fracture was 4.5 cm or more from the plafond of the distal tibial articular surface. A short oblique fracture was defined when the height was less than 4.5 cm. The demographic characteristics and syndesmotic instability of the two groups were evaluated. Results: Short oblique fractures were confirmed in 102 cases, and long oblique fractures were confirmed in 30 cases. Long oblique fractures occurred at a statistically significantly higher incidence in younger ages and among males compared to short oblique fractures. Syndesmotic instability was more common in long oblique fractures. Conclusion: In supination-external rotation-type ankle fractures, syndesmotic instability was observed in approximately 13%. Specifically, when the fracture pattern of the lateral malleolus is long oblique, the incidence of syndesmotic instability is approximately three times higher than in short oblique fractures. Therefore, meticulous evaluations of the lateral malleolus fracture pattern and establishing an appropriate treatment plan before surgery are crucial.
Gun-Woo LEE, Jong-Eun KIM (Gwangju, Republic of Korea), Keun-Bae LEE
00:00 - 00:00 #42621 - PO21 Observational study of long-term (14 years) outcomes of operatively treated ankle fractures in a cohort of 330 patients.
PO21 Observational study of long-term (14 years) outcomes of operatively treated ankle fractures in a cohort of 330 patients.

Introduction: Although internal fixation surgery of displaced ankle fractures is amongst the most commonly performed operations, there is little published on long-term outcomes. The true incidence of post-traumatic osteoarthritis (PTOA) requiring intervention is not well known. This study aims to establish the incidence of complications and long-term outcomes, specifically the development of arthritis. Furthermore, it aims to determine the effect of patient characteristics on these outcomes. Method: Between January 2009 and December 2010, 330 patients underwent ankle fixation. Patient demographics, comorbidities and complications including infection, non-union, further surgery, and PTOA were recorded. Two proportion hypothesis testing was used to establish whether patient characteristics affected outcomes. Results: There was a 1.2% and 1.5% incidence of superficial and deep infection respectively. 21.5% (71/330) underwent further surgery with 1.5% requiring revision fixation and 17.6% removal of metalwork. The latest clinical information showed 3.6% (12/330) developed PTOA with only 5 patients requiring surgery including three ankle fusions. There was a statistically significant increase in delayed union rates (P=0.041) in smokers. There was a higher rate of deep infection, delayed union and revision surgery in diabetic patients and higher rates of PTOA and requirement for surgical management of PTOA in overweight patients, although these did not reach statistical significance. Conclusion: Our results show low incidences of short-term complications and development of arthritis in the long-term following internal fixation of ankle fractures. In our study, smokers had higher rates of delayed union but there was no significant correlation between patient characteristics and comorbidities on other outcomes.
Taegyeong Tina HA, Kirsten GRANT, Jane MADELEY, Senthil KUMAR (Glasgow, United Kingdom)
00:00 - 00:00 #42637 - PO22 Optimizing Maisonneuve Fracture Reduction: A Case Series Using a Novel Distraction Technique.
PO22 Optimizing Maisonneuve Fracture Reduction: A Case Series Using a Novel Distraction Technique.

Background: Maisonneuve fracture involves the disruption of the syndesmosis and necessitates surgical intervention. The aim is to restore fibula length and stabilize the syndesmosis. Classic manual reduction may be strenuous to maintain during the syndesmosis fixation. Hence, we report our method of reduction with a distraction technique that provides mechanical advantages. Case Presentation: We present a case series of 3 patients with Maisonneuve fracture where indirect fibula reduction was achieved via a novel distraction technique with instruments. Case 1 and 2 suffered an isolated high fibular fracture whereas Case 3 had concomitant ankle fractures. Syndesmosis disruption was confirmed with intraoperative Cotton's and external rotation test. All 3 cases underwent dual tightrope fixation of the syndesmosis. To achieve the reduction, a 3 hole plate was applied on the distal fibula fragment with a cortical screw applied over the most proximal hole. Subsequently, a 5mm Steinmann pin was drilled into the lateral tibial. The entry point of the tibial pin is immediately anterior to the fibula and 2cm proximal to the applied fibular plate. An edged lamina spreader was used to apply distraction between the plate and the Steinmann pin. Temporary reduction is held with a quadcortical K-wire, followed by tightrope fixation through the middle and inferior holes of the fibular plate. Clinical Outcomes: Postoperative imaging showed normal talocrural angle and presence of the fibula dime sign. Discussion: This technique provides mechanical advantages in strength and stability, holding the reduction whilst freeing up the surgeon's hands to perform the syndesmosis fixation.
Craigven SIM (Singapore, Singapore), Eric CHER
00:00 - 00:00 #42732 - PO23 The Deltoid-Spring Ligament Complex: A Scopus Review and Segmental classification.
PO23 The Deltoid-Spring Ligament Complex: A Scopus Review and Segmental classification.

Objective: evaluate and report the variation in descriptions and currently accepted terminology for the individual bands comprising the deltoid and spring ligaments in anatomical dissection studies. Methods: literature search for cadaveric studies identifying anatomical variations in the deltoid and spring ligament complexes was conducted using PubMed and Medline databases. The inclusion criteria encompassed human cadaveric dissection studies with measurement of individual deltoid and spring ligament bands, human cadaveric studies, English language and full-text availability. The following studies were excluded: animal studies, articles describing surgical repair approaches and radiological assessment studies without cadaveric dissection. The demographic data, parameters of individual components as well as the morphological structure of individual deltoid bands were summarised. Results: Out of the 18,208 studies from the database search, 11 articles were included in this study. 13 additional studies were obtained from the bibliographies, resulting in a total of 24 studies with 528 ankles evaluated. Conclusion: Due to the complexity of their anatomical relationships, the deltoid and spring ligaments should be described as a single entity: the ‘deltoid-spring ligament complex’. Its gross morphology can be described as triangular, trapezoidal, and rectangular. It can be differentiated into the deep deltoid and the superficial deltospring ligament which are connected. The latter encompasses the superficial deltoid and superomedial part of the spring ligament. The deep plantar ligament or ‘the inferior spring ligament’ are separate entities reflecting their discrete natures and histological difference. The superficial deltospring ligament can be divided into contiguous segments with variable bands (thickening but not true ligaments
Zain Al Abdeen AL ZUABI (kings lynn, United Kingdom), Pasapula CHANDRA, Andrey BILYY, Waiwai WINMAR, Honey MANSO, Steven FAMURE, Georgios SOLOMOU, Cecilia BRASSETT
00:00 - 00:00 #42741 - PO24 Arthroscopic versus Open Repair for Chronic Lateral Ankle Instability: An Updated Systematic Review and Meta Analysis.
PO24 Arthroscopic versus Open Repair for Chronic Lateral Ankle Instability: An Updated Systematic Review and Meta Analysis.

Background: Lateral ankle sprains are the most common injury in sports. Up to 40% of patients fail conservative treatment, developing chronic lateral ankle instability. In recent years, arthroscopic Brostrom repair has gained increasing popularity to address the challenges of performing open repair. However, evidence has been equivocal regarding its clinical outcomes when compared to an open approach. Aim: Compare arthroscopic and open approach to provide additional perspective when managing chronic lateral ankle instability Methodology: Systematic review and meta-analysis with trial sequential analysis (from inception to 10 June 2023) searching PubMed, Embase, Scopus, Cochrane. Registered on PROSPERO (CRD42023389626). Primary outcomes: Mean difference of functional and clinical outcomes (American Orthopaedic Foot & Ankle Society score, Karlsson score, visual analog scale) Secondary outcomes: Risk ratio of complications Results: Arthroscopic Brostrom is clinically more effective compared to the open approach based on post-operative American Orthopaedic Foot & Ankle Society scores. Pooled post-operative American Orthopaedic Foot & Ankle Society scores was higher in arthroscopic group (MD = 1.08, 95% CI: 0.19 - 1.97, p = 0.02, 12 studies) Pooled post-operative Karlsson scores and visual analog scale scoresdid not reach statistical significance. Discussion: Arthroscopic Brostrom approach confers better functional outcomes compared to the open approach, with both groups having low, non-significant complication rates between each other. Other factors such as availability of resources, expertise, and manpower need to be considered as well. Nonetheless, the absence of statistically significant differences between complications in both arthroscopic and open Brostrom procedures suggest they are safe and viable options.
Ryan Wai Keong LOKE, Alexander Xi Xuan ANG, Jonathan Jia En BOEY (Singapore, Singapore), Vikaesh MOORTHY, Ruixiang TOH, Kae Sian TAY
00:00 - 00:00 #42829 - PO25 Total ankle replacement versus non-operative management for end-stage ankle osteoarthritis: a comparative analysis at 1-2 years follow-up.
PO25 Total ankle replacement versus non-operative management for end-stage ankle osteoarthritis: a comparative analysis at 1-2 years follow-up.

This prospective cohort study including adults with end-stage ankle osteoarthritis compares a 1 to 2-year outcome of total ankle replacement (TAR) to that of non-operative management (NOM). The primary outcome is measured by VR-12, FAOS (5 subclasses), patient satisfaction, and PCS short form. Statistical analysis was performed using one-way ANOVA as well as t-tests. 295 index procedures were included in the PROMs analysis of which 138 surgical (47,40%) and 152 non-operative (52,60%). Among the non-operative group, 85 patients (56%) were not offered surgical treatment and 72 patients (44%) decided to delay their surgery by more than 1 year. At 1-year follow-up, the treatment survival was 80,9% in the delayed surgery group and 94,4% in the not offered group. In the surgical group, there was 1 failure (99,3% survival). A significantly (P<0,001) worse FAOS pain score at follow-up was seen for the delayed group (61,6) compared to the not offered (69,1) and surgical group (78,1). Similarly, FAOS QoL was significantly (P<0,01) lower for the delayed group (39,6) compared to the surgical group (58,3) with an average difference of 19.7 points (95%CI 9.9 - 29.4). Between the not offered (50,1) and surgical group (58,3) there was a not significant (P=0,12) average difference of 8.2 points (95%CI -2.3 - 18.6). We conclude that TAR is superior to NOM regarding pain treatment for end-stage ankle osteoarthritis. Conservative treatment remains a valid option in end-stage osteoarthritis, however, if TAR is indicated and surgery is delayed these patients suffer worse outcomes during the delay time.
Karolien SCHWAGTEN (Kortrijk, Belgium), Mathieu DEJONGHE, Corey SCHOLES, Andrew WINES
00:00 - 00:00 #42869 - PO26 Arthroscopic treatment of chronic lateral ankle instability: a new technique.
PO26 Arthroscopic treatment of chronic lateral ankle instability: a new technique.

Chronic lateral ankle instability (CLAI) is prevalent in sports, traditionally treated with open surgery – modified Broström-Gould. Recently, arthroscopic treatment has gained interest, though studies are limited. This study introduces a new arthroscopic CLAI repair technique using knotless anchors, comparing its outcomes to existing literature and evaluating postoperative improvements in clinical and functional scores. Data was collected from 36 patients (64% male, 36% female, mean age 27.5) who underwent arthroscopic repair with a knotless anchors system. Evaluations were conducted preoperatively, and at 6 and 12 months postoperatively, measuring variables such as age, sex, Visual Analog Scale (VAS), American Orthopaedics Foot and Ankle Society Score (AOFAS) Ankle-Hindfoot Scale, Karlsson-Peterson score, patient satisfaction, and surgical complications. Results indicated significant improvements in VAS, AOFAS, and Karlsson-Peterson scores (p < 0.001) at both 6 and 12 months. The AOFAS score increased from a median of 61.0 preoperatively to 96.0 at 6 and 12 months. The Karlsson-Peterson score improved from a median of 45.0 preoperatively to 95.0 at both postoperative intervals. Patient satisfaction at 12 months was high, with 91.7% very satisfied and 8.3% satisfied, and only two minor complications reported. No significant impact of age or gender on outcomes was found. The new arthroscopic technique with knotless anchors demonstrated excellent short-term postoperative recovery. Future research should compare this technique with open Broström-Gould surgery and other arthroscopic methods using knot systems.
Luís FABIÃO (Barcelos, Portugal), Vítor MACEDO-CAMPOS, Rita FARIA DE CASTRO, Tiago P. BARBOSA, João CASTRO MENDES, Luís Miguel SILVA, Tiago FRADA, Daniel FREITAS, Guilherme FRANÇA, Nuno ESTEVES, Bruno S. PEREIRA
00:00 - 00:00 #42884 - PO27 Ankle arthrodesis case report – back to basics.
PO27 Ankle arthrodesis case report – back to basics.

Introduction: Ankle arthrodesis is considered in cases of advanced arthrosis, arthroplasty failure or other. Objectives: Illustrate a clinical case that was used twice on the same patient in different phases. Materials/methods: The bibliography related to ankle arthrodesis was reviewed and the clinical file of the illustrated case was consulted. Results: A 56-year-old man presents with a 2-year history of intense pain in the right ankle. Past history refers to a work accident(2003) resulting in a fracture of the tibial pilon-osteosynthesis was performed. Due to progression to osteoarthritis and disabling pain, he underwent ankle arthrodesis. Later, in 2007, he underwent disarthrodesis and total ankle arthroplasty. At the appointment(2022), evidence of astragaline loosening, bone cysts, lateral malleolus stress fracture and subastragaline arthrosis. He underwent prosthesis extraction and calcaneo-tibial arthrodesis with a nail (anterior approach) and space filling with a tricortical iliac graft and a cadaveric allograft (lateral approach). The surgery was uneventful. No isolation in microbiology. The patient evolved favorably, with superficial infection (empiric antibiotic-therapy), use of a walker-boot and consolidation with progression to full weight bearing at 12 weeks. He only complaints of dysmetria(2cm), managed with height compensation. AOFAS Ankle-Foot Scale:74. Conclusions: Constraints for ankle arthrodesis and arthroplasty present some overlap. Calcaneo-tibial arthrodesis presents itself as a surgical alternative in cases of ankle arthroplasty failure, namely as an alternative to revision arthroplasty. The results are predictably a stable, painless limb with functional gait. In the presented case (18months follow-up) the patient is well adapted, without limitations in ADLs, with autonomous gait.
Rute SANTOS PEREIRA, João RAPOSO (Porto, Portugal), João CRUZ, Joana RODRIGUES, Claudio GARCIA, Tiago CANAS, Ricardo SIMÕES
00:00 - 00:00 #42902 - PO28 Fixed-Bearing Versus Mobile-Bearing in Total Ankle Arthroplasty: A Systematic Review and Meta-Analysis.
PO28 Fixed-Bearing Versus Mobile-Bearing in Total Ankle Arthroplasty: A Systematic Review and Meta-Analysis.

Background Total Ankle Arthroplasty (TAA) is an effective solution in the end-stage ankle arthritis. New generation’s implants have demonstrated encouraging intermediate clinical results: modern systems have either a fixed-bearing (FB) or a mobile-bearing (MB) design. Literature shows no clear evidence about the differences between the two types of prostheses. Objectives The aim of the study is to compare FB and MB prosthesis systems, specifically evaluating for each group (i) the revision rate in terms of conversion to arthrodesis, replacement TAA and below-knee amputation; (ii) minor events that still required surgery; (iii) and to provide an overview of total ankle replacement, including its advantages and disadvantages. Study Design & Methods A systematic review of the literature was performed. The Preferred Reporting Items for Systematically Reviews and Meta- Analyses (PRISMA) was followed. Retrospective and prospective studies were evaluated and added to the final reference list. Indeed, all case reports, case series and systematic reviews were excluded. Results Forty-six articles were included in the review. Relevant data were systematically collected. A meta-analysis was conducted among similar data, showing the failure risk and revision rate among the two different groups. No significant statistical differences were found in terms of complications rate. Conclusions TAA is a challenging procedure both technically and for the high revision rate. Both types of ankle prostheses, with mobile-bearing or fixed-bearing, appear to be valid options for the treatment of ankle arthritis, with an intermediate risk of short, medium, and long-term complications.
Chiara COMISI (ROMA, Italy), Tommaso GRECO, Virginia CINELLI, Antonio MASCIO, Chiara POLICHETTI, Giulio MACCAURO, Carlo PERISANO
00:00 - 00:00 #42903 - PO29 “Intact” lateral ankle ligaments finding on MRI does not imply “competent” ligaments -The role of EUA in chronic symptomatic Ankle Instability.
PO29 “Intact” lateral ankle ligaments finding on MRI does not imply “competent” ligaments -The role of EUA in chronic symptomatic Ankle Instability.

Introduction Chronic lateral ankle instability often follows traumatic rupture or pathological laxity of the lateral ankle ligament complex. While MRI is useful in identifying complete ligament tears, it may not reliably detect incompetence in pathologically elongated ligaments. This study aims to determine if EUA is a superior diagnostic tool compared to MRI scans in accurately diagnosing chronic lateral instability. Methods We conducted a prospective case analysis of 50 symptomatic patients who underwent lateral ligament reconstruction for chronic ankle instability. Each patient underwent both EUA and MRI scans prior to surgery. EUA was performed in the operating theatre under general anaesthesia, using image intensifier guidance to conduct anterior drawer stress and talar tilt tests. MRI scans were independently evaluated by two experienced musculoskeletal radiologists. Results EUA indicated complete insufficiency of the ankle in all 50 patients, as evidenced by positive anterior drawer and talar tilt tests. MRI scans reported complete ligament rupture in 17 patients (34%), thickened ATFL (Anterior Talo-Fibular Ligament) and CFL (Calcaneo-Fibular Ligament) ligaments in 18 patients (36%), and an intact lateral ligament complex in 15 patients (30%). Conclusion EUA, in conjunction with symptomatic instability, appears more reliable in assessing lateral ligament instability compared to MRI scans. While MRI is valuable for identifying additional pathologies such as osteochondral lesions, peroneal tendon subluxation or tear, and syndesmotic injuries, it is less effective for evaluating hyperlaxity and elongated lateral ligaments. Therefore, EUA should be considered a critical diagnostic tool in managing patients with chronic lateral ankle instability.
Aysha RAJEEV, George KOSHY (GATESHEAD, United Kingdom), Kailash DEVALIA
00:00 - 00:00 #42904 - PO30 Foot and ankle trauma: epidemiology before, during and post COVID - 19 pandemic in a Level I Trauma center. A 5-year experience and data analysis.
PO30 Foot and ankle trauma: epidemiology before, during and post COVID - 19 pandemic in a Level I Trauma center. A 5-year experience and data analysis.

Background Foot and ankle injuries are one of the most orthopedic leading causes of emergency department (ED) admissions. The purpose of this study is to analyze, through 5 years of data collection, differences in number and type of admission of foot and ankle trauma to the ED in the pre-pandemic period, during the COVID-19 emergency, and in the post-pandemic period. Methods 5 years data were collected on admissions to the ED of the University Policlinic A. Gemelli, using the regional GIPSE system. Data was extensively collected and analyzed to obtain epidemiological and clinical evaluation. Result In the pre-pandemic period, 2228 ED accesses were recorded, including 1138 males with a mean age of 37 years and a mean of 2.8 accesses per day, with an average surgical treatment of 4.5%. During the COVID period the total number of accesses was 981, with an average surgical treatment of 10.4%. In the post-COVID period, 578 accesses were collected, with an average surgical treatment of 9,1%. Conclusions During the pandemic period due to Covid-19 was noted a substantial decrease in total admissions per day to the ED, but an increase in more complex codes, as evidenced by the percentage increase in surgical admissions compared to total admissions during the pandemic; the average age of users gradually increased. Total hospitalization data remained overlapping in the post-pandemic period, probably due to the global impact of the pandemic. Covid-19 radically and concretely changed people's living habits and priorities for accessing the ED.
Antonio MASCIO (ROMA, Italy), Chiara COMISI, Tommaso GRECO, Chiara POLICHETTI, Virginia CINELLI, Giulio MACCAURO, Carlo PERISANO
00:00 - 00:00 #42913 - PO31 Predictive factors for tillaux-chaput tubercle fracture: a case-control study of 28 cases.
PO31 Predictive factors for tillaux-chaput tubercle fracture: a case-control study of 28 cases.

Background Tillaux – Chaput tubercle fractures in adults often go unnoticed in ankle trauma. This study aimed to identify clinical and radiological factors associated with these fractures to develop a decision aid for CT diagnosis. Methods This case-control study included 72 patients with bimalleolar fractures who underwent both radiography and CT scans. The case group consisted of 28 patients with Tillaux – Chaput fractures, and 44 served as control. Socio-demographic, clinical data and injury mechanisms according to Arimoto and Forester's algorithm were compared using univariate and multivariate analysis to identify predictive factors. Results Tillaux-Chaput factures were missed on standard radiographs in 60% of the cases. Predictive factors of Tillaux-Chaput fractures were age > 60 years, injury on the dominant side, and Pronation – External Rotation injury mechanisms. Conclusion In the absence of routine CT scan for ankle fracture preoperative assessment we recommend a CT scan for elderly patients with ankle fractures on the dominant side, particularly with stage III or IV Pronation-External Rotation mechanisms.
Cedric DONGMO MAYOPA (Brussels, Belgium), David ANCELIN, Despotin PAULINE, Julie MANON, Gaspary FODJEU, Randy BUZISA MBUKU, Masscheleyn MAXIME, Olivier CORNU, Karim TRIBAK, Dan PUTINEANU
00:00 - 00:00 #42926 - PO32 Tibiotalocalcaneal Arthrodesis with Retrograde Intramedullary Nail: A Retrospective Analysis of Results Over 7 Years.
PO32 Tibiotalocalcaneal Arthrodesis with Retrograde Intramedullary Nail: A Retrospective Analysis of Results Over 7 Years.

OBJECTIVE: To analyse the outcomes of 44 cases of tibiotalocalcaneal arthrodesis using a retrograde intramedullary nail. METHODS: This retrospective study reviewed 44 surgeries performed between 2017-2023, evaluating aetiology, surgical technique, consolidation, postoperative complications, and clinical outcomes using the American Orthopaedic Foot & Ankle Society (AOFAS) and Ankle-Hindfoot Scale and the Visual Analogue Scale (VAS) for pain. RESULTS: The cohort included 26 women and 17 men, with an average age of 59 years. The most common aetiology was severe post-traumatic arthritis (52%), followed by poliomyelitis sequelae, Charcot neuroarthropathy, clubfoot, and neurological injuries. Surgeries were performed in the supine position, using anterior (54.5%) or lateral approaches with fibular resection (29.5%). Hindfoot malalignment was present in 75% of patients. Primary arthrodesis was performed in 2 cases. We do not prepare the subtalar joint. Bone grafting was used in 34% of cases, with 11 cases using femoral head allograft and 4 cases using fibular autograft. The average surgical time was 132 minutes. Consolidation was achieved in 97.7% of cases, with a median radiographic consolidation time of 20 weeks. One patient developed pseudoarthrosis. CT scans in 22 cases showed complete tibiotalar fusion. Superficial dehiscence was the most common complication (9 cases), and one patient had a deep infection. The average AOFAS score was 67/100, the average VAS score was 3/10, and all patients would undergo surgery again. CONCLUSIONS: Tibiotalocalcaneal arthrodesis with retrograde intramedullary nail is a reliable option for managing advanced arthritis with or without malalignment, providing stability, high consolidation rates, and few major complications.
Ramiro VERA SALAS (Santiago, Chile), Frano ATLAGICH LOPEZ, Luis ORTIZ MENESES, Sergio FUENTES TRAVERSO, Andres FUENTEALBA POOLEY, Hugo HENRIQUEZ SAZO
00:00 - 00:00 #42934 - PO33 Ankle arthrodesis with Neofuse® In2Bones® anterior plate : preliminary results of a prospective multicentric study.
PO33 Ankle arthrodesis with Neofuse® In2Bones® anterior plate : preliminary results of a prospective multicentric study.

Introduction : Tibio-talar fusion is the gold standard for the treatment of end-stage arthrosis. The anterior plate and isolated screw fixation is mechanically the most stable and achieves a higher consolidation rate. The study aims to evaluate the performance and safety of the Neofuse® In2Bones® anterior plate arthrodesis. Method : This is a one-year prospective multicentric European study. The primary outcome measure is tibio-talar consolidation. Secondary outcome includes radiographic measurements, functional results and scores, clinical stability and fusion, as well as device safety evaluation. Results : The preliminary study results on 35 patients who completed follow-up are presented. Fusion was achieved in 97.1% of cases (34/35) with a mean time of 3.9 months. Patients returned to work/daily activities at 5.3 months. At one year, 100% (35/35) are stable with 91% (32/35) of normo-axial hindfoot. Comparing pre-operative and post-operative scores at one year showed a significant improvement : 7 vs 2 for VAS, 29 vs 74.2 for AOFAS, 6 vs 17 for EFAS, 27.2 vs 36.4 for SF12, all with p<0.001. The one-year radiographic results showed mean frontal, sagittal and tibia axis-to-talus alignments of 91.1° (79-98), 104° (88-122) and 36.3 (27-45) respectively. Conclusion : The Neofuse® In2Bones® tibio-talar arhtrodesis device demonstrates excellent results in this preliminary study. The fusion rate of 97.1% is comparable to the literature. The study reports no complication directly related to the device. The surgical objective of achieving consolidation in a good position as well as clinical objectives of painlessness and stability are perfectly met.
Floriane MOORE (Dijon), Yves TOURNÉ
00:00 - 00:00 #42936 - PO34 Technique and early results of endoscopic flexor hallucis longus transfer with interference screw and additional tension slide cortical button for achilles tendon rupture.
PO34 Technique and early results of endoscopic flexor hallucis longus transfer with interference screw and additional tension slide cortical button for achilles tendon rupture.

Background Endoscopic flexor hallucis longus (FHL) transfer can be used in the management of acute Achilles tendon rupture. A cadaveric study demonstrated greater strength can be achieved using an FHL transfer with interference screw and cortical button slide technique compared to an interference screw alone. Objectives Demonstrate this novel technique to be a safe and effective treatment method. Methods The complications and patient related outcome measures (PROMs) of 10 patients who underwent Achilles tendon rupture repair using the aforementioned technique were reviewed. Validated scoring systems were utilised (EQ-5D, Manchester.Oxford Foot Questionnaire (MOxFQ) and Visual Analogue Score for pain (VAS Pain)) with results collected via the BOFAS Amplitude registry pre-operatively and at 6 monthly intervals post-operatively. Results Mean (SD) age at time of surgery is 58 (16.3) years. EQ-5D improved from a mean (SD) of 0.48 (0.35) pre-operatively to 0.76 (0.26) at 6 months and 0.98 (0.05) at 12 months post-operatively. Similarly, VAS Pain improved from an average of 40.6 (30.9) pre-operatively to 15.4 (27.2) and 2.2 (4.3) at 6 and 12 months respectively. Improvements in MOxFQ were reported across all three domains post-operatively also. One patient developed tibial nerve neuritis: no further complications were reported. Conclusion This endoscopic method is safe, effective and provides a stronger repair. Early patient data shows improvements in quality of life, pain and specific foot and ankle outcome measures following surgery. Further studies are required with longer term follow up and greater patient numbers. Clinical comparison to standard interference screw fixation should also be undertaken.
Samuel FRANKLIN (London, United Kingdom), Vikramman VIGNARAJA, Tom LEWIS, Robbie RAY
00:00 - 00:00 #42937 - PO35 Results of ultrasound guided hyaluronic acid injection in patients with ankle osteoarthritis and osteochondral lesions of the talus.
PO35 Results of ultrasound guided hyaluronic acid injection in patients with ankle osteoarthritis and osteochondral lesions of the talus.

Introduction: Ankle osteoarthritis (OA) and osteochondral lesions of the talus (OLT) can be managed conservatively with different strategies with surgery reserved for failures of conservative management. Objectives: Describe the effects regarding pain relief and possible complications of hyaluronic acid (HA) injection in patients with ankle OA and OLT. Methods: Observational study of patients with ankle OA and OLT that had an ultrasound guided HA injection by the radiology department between January 1st 2020 and December 1st 2023 in our center and a minimum follow-up of 6 months. Patients' visual analog scale (VAS) at baseline, 3 months and 6 months after injection were recorded. Exclusion criteria were administration of another medication (except mepivacaine) or biological therapy and incomplete data collection during follow-up. Results: 137 patients were referred to the radiology department for an ultrasound guided injection. Fifty-eight patients (63 ankles) that received HA injection for ankle OA and OLT were identified. Thirty-seven (42 ankles) were included. Baseline VAS score was 7.98 ± 1.37; 5.76 ± 2.14, and 6.64 ± 2.07 at 3 and 6 months post injection respectively (p<0.05). Patients reported a mean of 7.9 ± 7.81 months with some pain relief. Patients mean age was 59.6 (range 32-83) and mean follow-up was 18.8 ± 12.1 months. Eleven (26.2%) patients received a second HA injection and 7 (16.6%) underwent surgery during follow-up. No complications were recorded in this series. Conclusion: HA injections is a safe treatment that may provide a temporary pain improvement in patients with ankle OA and OLT.
Enrique Alberto VARGAS MEOUCHI, Andrea SALLENT FONT (Barcelone, Spain), Iker BENEGAS LAGE, Yuri Denis LARA TARANCHENKO, Gemma DUARRI LLEDO, Rosa BUSQUETS NET, Matias DE ALBERT, Marta ALTAYO CARULLA, Ignacio MALED GARCIA
00:00 - 00:00 #42942 - PO36 Description and considerations of tibial cartilage involvement in Chevron and Oblique type medial malleolus osteotomies. A Cadaveric study.
PO36 Description and considerations of tibial cartilage involvement in Chevron and Oblique type medial malleolus osteotomies. A Cadaveric study.

The most commonly medial malleolus osteotomy used are Chevron(OMM-C) and Oblique(OMM-O). A bony "safety zone" with less cartilage is described for this technique, however, the difference between the two techniques and the impact of the surgeon's experience is not described. The objective is to quantify tibial articular cartilage damage according to type of osteotomy and surgeon experience. Surgeons with 20 years (C1) and 3 years (C2) of experience. Osteotomy angulation was measured, photographic recording of tibial plateau determining distance (mm) between "safety zone" and osteotomy; percentage of cartilage area involved. 28 cadaveric legs. Median angulation of OMM-C 54.5º and OMM-O 59º. According to surgeons C1 and C2, median OMM-C angulation 54º and 56º with no differences; OMM-O 52º and 64º with differences (p=0.0017) respectively. Presence of 63.5% of cartilage in "safety zone". More secure location medial to the "safety zone" in OMM-C versus OMM-O and in C2 versus C1. Median compromise of 0% and 1.1% of the tibial plafond area for OMM-C and OMM-O respectively, with no differences. No differences according to surgeon and osteotomy. In this study, there were no differences in angulation between osteotomies, neither according to surgeon in OMM-C, but there was a greater cutting angulation in OMM-O of the less experienced surgeon. The "safety zone" was confirmed at 63.5% cartilage. OMM-C was located more medial to the "safety zone", towards the medial malleolus, versus OMM-O. Both osteotomies had low involvement of the articular cartilage area with no differences between osteotomies or surgeons.
Pablo RUIZ RIQUELME, Albert BADUELL, Magdalena CASTRO, Miki DALMAU PASTOR, Carlo GAMBA, Daniel POGGIO CANO, Enrique Adrian TESTA (Bellinzona, Switzerland)
00:00 - 00:00 #42949 - PO37 A Glomus Tumor at the Achilles Tendon: A Case Report.
PO37 A Glomus Tumor at the Achilles Tendon: A Case Report.

A glomus tumor is a painful soft tissue neoplasm arising from the glomus body. The tumor usually presents itself with a triad of symptoms: pain, touch and cold sensitivity. The most common site of occurrence is the nail bed of the hand; other locations are far less common. Presentation in the ankle is rare. In the present study, we report a case of a patient with a glomus tumor at an atypical site, the Achilles tendon. A 75-year-old man presented to our department with a history of 6 months severe pain in the area of his right Achilles tendon, provoked by palpation or wearing shoes. Physical examination showed a painful, 1 cm large mobile lump at the medial border of the Achilles tendon. Gentle palpation of the lump provoked severe pain. Magnetic resonance imaging showed a non-specific change at the Achilles tendon, which could represent fluid collection. Rupture or calcifications of the Achilles tendon were excluded. The patient underwent surgical excision of the mass. Surgical exploration revealed a well-defined blue lesion on the Achilles tendon, approximately 1 cm in diameter. The lesion was excised and sent for histopathological examination. Gross examination revealed a flat solid grey-brown oval mass measuring 12 x 8 x 4 mm. A histopathologic diagnosis was reported as a glomus tumor. At the one-month follow-up visit, the patient presented pain free and could wear regular shoes.
Erika JERELE (NOVO MESTO, SLOVENIA, Slovenia), Matevž BAJUK, Pika KRIŠTOF MIRT
00:00 - 00:00 #42970 - PO38 Improvement in clinical outcomes following arthroscopic all‐inside medial lateral ligament reconstruction for rotational ankle instability.
PO38 Improvement in clinical outcomes following arthroscopic all‐inside medial lateral ligament reconstruction for rotational ankle instability.

Purpose: Rotational ankle instability can be diagnosed in up to 18% of cases of chronic ankle instability. It is caused by injury to the deltoid ligament secondary to chronic deficiency of the lateral collateral ligament. This prospective observational study aimed to investigate clinical outcomes following arthroscopic all‐inside medial and lateral ligament reconstruction for rotational ankle instability. Methods: A prospective observational study of consecutive patients undergoing arthroscopic all‐inside medial and lateral ligament reconstruction with minimum 6‐month follow‐up. The primary outcome was a validated patient‐reported outcome measure (PROM), the Manchester‐Oxford Foot Questionnaire. Secondary outcomes included EQ‐5D, European Foot and Ankle Society score and complications. Results: Between 2020 and 2023, 12 patients underwent primary reconstruction for rotational ankle instability with pre-and post‐operative PROMs collected. The mean ± standard deviation age was 33.9 ± 7.2 years + mean follow‐up was 1.9 ± 1.2 (range: 0.5–3.8, interquartile range: 0.9–3.0) years. There was a significant improvement in all Manchester‐ Oxford Foot Questionnaire scores (p < 0.05): Index 53.1 ± 19.1 to 26.4 ± 27.6, Pain 46.7 ± 20.3 to 26.2 ± 26.8, Walking/Standing 58.7 ± 26.0 to 27.0 ± 30.0 and Social Interaction 51.2 ± 19.5 to 25.6 ± 30.1. There were improvements in EQ‐5D‐5L Index, VAS and VAS Pain. There was one complication—a superficial peroneal nerve injury which resolved with corticosteroid injection. Conclusion: The arthroscopic all‐inside medial and lateral ligament reconstruction technique is a reliable and safe method for treating rotational ankle instability, demonstrating significant improvement in PROMs at a mean 1.9‐year follow‐up.
Thomas LEWIS, Joe AYATHAMATTAM, Vikramman VIGNARAJA, Mikel DALMAU-PASTOR, Gabriel FERREIRA, Gustavo NUNES, Robbie RAY (London, United Kingdom)
00:00 - 00:00 #42971 - PO39 Osteochondral Lesions of the Ankle: Autologous Osteochondral Transplantation from the Knee. Clinical and Functional Outcomes of the Donor and Recipient Sites.
PO39 Osteochondral Lesions of the Ankle: Autologous Osteochondral Transplantation from the Knee. Clinical and Functional Outcomes of the Donor and Recipient Sites.

Introduction:Autologous Osteochondral Transplantation (OAT) effectively treats talus osteochondral lesions, enhancing functionality and promoting a return to sports. This study evaluates clinical and functional outcomes, complications, and patient satisfaction post-OAT, and examines the return to work and sports. Methods: Observational, retrospective study. Includes patients treated with OAT for talus osteochondral lesions from 2011 to 2022. Inclusion criteria: Patients over 18, minium one year of follow-up. Exclusion criteria: Previous ipsilateral knee pain or surgery, infections, advanced osteoarthritis, rheumatologic diseases. Demographics, injury mechanism, sports activity, lesion details, associated procedures, consolidation time, follow-up, and return to activities were recorded. Clinical outcomes were assessed using AOFAS, Lysholm, Tegner, VAS scores. Patient satisfaction, return to sports, and complications were evaluated. Statistical significance was p < 0.05. Results: 37 patients (median age 36, 78.37% male), median follow-up was 24 months. Lesions were primarily sports-related and medially located, with a median area of 150mm². Postoperative outcomes showed significant improvement: AOFAS ankle scores increased from 54.45 to 95.81, and ankle VAS scores decreased from 7 to 1.59. Knee VAS and Lysholm scores averaged 1.81 and 98.78, respectively. Return to work averaged 2.29 months, and return to sports 6.53 months, with 37.5% changing sports activity. Tegner scores slightly improved from 5.4 to 5.45. Complications were minimal, with one case of knee hemarthrosis and one anterior ankle arthroscopy. Conclusion: OAT for talus chondral lesions is a safe and effective treatment with positive clinical outcomes, low complication rates, high satisfaction, and a high return to sports, without increased knee morbidity.
Julieta BRUE (Buenos Aires, Argentina), Virginia CAFRUNI, Ana Cecilia PARISE, Julian PARMA, Pablo SOTELANO, Daniel VILLENA, Leonardo CONTI, Nelly Marina CARRASCO, Maria Gala SANTINI ARAUJO
00:00 - 00:00 #42979 - PO40 ARTHROSCOPIC MICROFRACTURE AND ASSOCIATED TECHNIQUES IN THE TREATMENT OF OSTEOCHONDRAL LESIONS OF THE TALUS: A SYSTEMATIC REVIEW AND METANALYSIS.
PO40 ARTHROSCOPIC MICROFRACTURE AND ASSOCIATED TECHNIQUES IN THE TREATMENT OF OSTEOCHONDRAL LESIONS OF THE TALUS: A SYSTEMATIC REVIEW AND METANALYSIS.

Background Osteochondral lesions of the talus are common in patients suffering even minor trauma; timely diagnosis and treatment can prevent the development of early osteoarthritis. The objectives of this systematic review and meta-analysis were to evaluate the effects of additional procedures on arthroscopic ankle microperforations for osteochondral lesions. Methods A systematic literature search was conducted using PubMed-Medline, Cochrane Central, and Google Scholar to select clinical studies analyzing the efficacy of platelet-rich plasma (PRP), hyaluronic acid (HA), and bone marrow concentrate (BMC) procedures. Ten articles following PRISMA guidelines with a total of 464 patients were included in this review. Quality assessment using MINORS was performed, and all studies demonstrated high quality. Results The results of the systematic review showed benefits in all patients undergoing infiltrative therapy with PRP, hyaluronic acid, and BMC. The best results in terms of AOFAS score and VAS scale were found in patients undergoing PRP injection. The meta-analysis showed improvements in pain relief and return to daily activities in patients undergoing arthroscopic microperforations and PRP, although not reporting statistically significant results (p = 0.42). Conclusion All treatment strategies reported better scores compared to the control groups. Among the various treatments analyzed, the addition of PRP appears to be the most valuable probably for the larger population receiving this treatment, showing excellent outcomes in pain reduction, clinical outcomes, and return to daily activities.
Susanna BASCIANI (Rome, Italy), Simone SANTINI, Gianluca MARINEO, Marco DONANTONI, Dario MARTINELLI, Marinozzi ANDREA
00:00 - 00:00 #42981 - PO41 CURRENT CONCEPTS IN ANKLE MICROINSTABILITY AND ANKLE FUNCTIONAL INSTABILITY.
PO41 CURRENT CONCEPTS IN ANKLE MICROINSTABILITY AND ANKLE FUNCTIONAL INSTABILITY.

Introduction Ankle microinstability (AM) is often an underdiagnosed condition resulting from injury to the superior bundle of the anterior talofibular ligament (ATFL) without evident laxity on physical examination. Various modifiable and nonmodifiable risk factors influence ankle stability, such as sports activity, BMI, strength deficits, age, axial deformities, previous trauma, and congenital joint laxity. The proprioceptive alteration, in addition to ligament damage, plays a significant role in functional ankle instability. Research has shown that individuals with a history of ankle injury experience deficits in proprioception, leading to an increased risk of new ankle sprains. Diagnosis and treatment Diagnosing AM can be challenging, as clinical examination may not reveal significant laxity. Stress radiography and arthrometry are valuable tools for assessing ankle laxity. Magnetic resonance imaging (MRI) helps evaluate associated injuries and cartilage damage, although it may not always detect small superior fascicle ATFL lesions. Arthroscopy remains the gold standard for diagnosing and treating microinstability and associated injuries. Conservative treatment is the initial approach. Surgical treatment is considered when conservative measures fail. Different surgical procedures, are available to address the type and severity of ATFL injury. The choice of procedure depends on the specific patient and injury characteristics. Conclusion In conclusion, AM is a challenging condition that can lead to various ankle problems. Diagnosis and treatment require a comprehensive approach, considering the type and severity of the injury, associated pathologies, and individual patient factors. Further long-term studies are needed to refine treatment strategies for different ATFL lesions.
Susanna BASCIANI (Rome, Italy), Simone SANTINI, Matteo GUELFI, Biagio ZAMPOGNA, Gianluca MARINEO, Dario MARTINELLI, Marco DONANTONI, Marinozzi ANDREA
00:00 - 00:00 #42982 - PO42 Particulated autologous cartilage transplantation (PACT) for the treatment of osteochondral lesion of the talus: can the lesion cartilage be recycled?
PO42 Particulated autologous cartilage transplantation (PACT) for the treatment of osteochondral lesion of the talus: can the lesion cartilage be recycled?

Aims: Osteochondral lesions of the talus (OLT) are a common cause of disability and chronic ankle pain. Many operative treatment strategies have been introduced, however, they have their own disadvantages. Recently lesion repair using autologous cartilage chip has emerged therefore we investigated the efficacy of particulated autologous cartilage transplantation (PACT) in OLT. Methods: We retrospectively analyzed 32 consecutive symptomatic patients with OLT who underwent PACT with minimum 1-year follow-up. Standard preoperative radiography and magnetic resonance imaging (MRI) were performed for all patients. Follow-up second-look arthroscopy or MRI was performed with patient consent approximately 1 year postoperatively. Magnetic resonance Observation of Cartilage Repair Tissue (MOCART) score and International Cartilage Repair Society (ICRS) grades were used to evaluate the quality of the regenerated cartilage. Clinical outcomes were assessed using the pain Visual Analog Scale (VAS), Foot Function Index (FFI), and Foot Ankle Outcome Scale (FAOS). Results: All patients had ICRS grade IV cartilage lesions, except for one (ICRS grade III). The paired MOCART scores significantly improved from 42.5 ± 1.53 to 63.5 ± 22.6 (P = 0.025) in 10 patients. Seven patients agreed to undergo second-look arthroscopy; 5 patients had grade I (normal) ICRS scores and 2 patients had grade II (nearly normal) ICRS scores. VAS, FFI, and all subscales of FAOS were significantly improved postoperatively (P ≤ 0.003). Conclusion: PACT significantly improved the clinical, radiological, and morphological outcomes of OLT. We consider this to be a safe and effective surgical method based on the short-term clinical results of this study.
Dong Woo SHIM (Seoul, Republic of Korea), Wonwoo LEE, Yeokwon YOON, Kwang Hwan PARK, Seung Hwan HAN, Jin Woo LEE, Bom Soo KIM
00:00 - 00:00 #42985 - PO43 The Impact of Tibiofibular overlap on Postoperative Plantar Pressure in Trimalleolar Fractures.
PO43 The Impact of Tibiofibular overlap on Postoperative Plantar Pressure in Trimalleolar Fractures.

Introduction: Trimalleolar fractures are complex injuries requiring precise surgical intervention to restore ankle stability and function. This study aims to analyze the relationship between tibiofibular overlap and baropodometric measurements post-surgery in patients with trimalleolar fractures and concomitant syndesmotic injury. Materials and Methods:This retrospective study included 28 patients (mean age 41.82 ± 13.32 years) who underwent surgery for trimalleolar fractures between 2018 and 2022. Postoperative evaluations were conducted with a mean follow-up period of 37.04 ± 10.33 months and included baropodometric measurements and radiographic measurements of tibiofibular overlap. Correlation analyses were performed to determine the relationships between these parameters. Results: Significant data were found between tibiofibular overlap and various baropodometric measurements on the operated foot. Notably, there were significant positive correlations with medial hindfoot force-time ıntegral, maxforce, peakpressure, and the maximum force and peak pressure of the 2nd and 3rd metatarsal heads (p<0.05) Conclusion: This study emphasizes the critical role of achieving optimal tibiofibular overlap in surgical interventions for trimalleolar fractures. Increased tibiofibular overlap is associated with improved baropodometric outcomes, particularly in the medial hindfoot and metatarsal regions, indicating that patients achieve a more normalized gait as the overlap increases. These findings highlight the importance of precise radiographic assessment and syndesmosis repair in the management of trimalleolar fractures. Keywords: Trimalleolar fractures, baropodometry, syndesmosis injury, tibiofibular overlap, plantar pressure, postoperative outcomes.
Hayati Hürol TÜRKOĞLU, Mehmet Ali TOKGÖZ (Ankara, Turkey), İnci AYAS
00:00 - 00:00 #42991 - PO44 Use of fresh-frozen allograft in osteochondral lesions of the talus.
PO44 Use of fresh-frozen allograft in osteochondral lesions of the talus.

Introduction and Objectives: Osteochondral talus lesions often need surgical intervention based on lesion size and articular cartilage integrity. We aim to assess the medium to long-term clinical-radiological evolution of the lesions treated by filling with allograft -in cystic lesions with intact cartilage- and with fresh frozen osteochondral allograft when there is chondral involvement. Materials and Methods: We conducted a retrospective study on patients with surgically treated osteochondral talus lesions. Arthritis severity was measured using Van Dijk's classification initially and at follow-up's end. We also assessed VAS, AOFAS, joint mobility, reintervention rates, and graft consolidation via CT or MRI. Results: Ten patients were included: four with bone allografts and six with frozen osteochondral allograft transplantation. Follow-up averaged 4 and 7 years. No significant complications or progression were noted. Cystic lesion fillings showed no arthritis progression, with a final VAS of 1.25 and AOFAS of 87. Osteochondral allograft patients had a 17% arthritis progression rate, moving from Van Dijk's grade II to III, with a final VAS of 2.1 and AOFAS of 77. Joint mobility was full in both groups. Graft consolidation was 100% in cystic lesion group. Only 17% showed partial consolidation and another 17% had no consolidation in the osteochondral allograft group. Half of the osteochondral allograft patients required reintervention. Conclusion: Fresh-frozen allografts are beneficial for filling cystic lesions and osteochondral transplants in talus injuries over the medium to long term, though the latter show slightly inferior clinical and radiological outcomes.
Saiz Modol CONRADO (Pamplona, Spain), Llombart-Blanco RAFAEL, Settels LUCIA ELISA, Valverde Gestoso CARMEN, Alfonso MATÍAS, Villas Tomé CARLOS
00:00 - 00:00 #42995 - PO45 Titanium Platform Cage as a device to fill bone voids and defects after TAA or revision of pseudarthrosis after ankle arthrodesis.
PO45 Titanium Platform Cage as a device to fill bone voids and defects after TAA or revision of pseudarthrosis after ankle arthrodesis.

The number of revision surgery after TAA and ankle arthrodesis is rising. The salvage procedure for these cases is the tibiotalar arthrodesis with augmentation. There is currently no primarily stable implant on the market to fill the bone voids and defects that occur after explantation of TAA or revision of pseudarthrosis after ankle arthrodesis. We present a new device to adress this specific problem showing six cases that underwent surgery of that kind. The implant ist a hygrostatic threedimensional crosslinked titanium cage that can be combined with intramedular nailing or extraarticular plating osteosynthesis. The principle of this technique has been succesfully used in spine surgery for years.
Uwe KLAPPER (Castrop-Rauxel, Germany)
00:00 - 00:00 #43000 - PO46 Addressing Severe Ankle Deformity in Charcot Arthropathy: Tibiocalcaneal Arthrodesis with Hindfoot Nail Technique.
PO46 Addressing Severe Ankle Deformity in Charcot Arthropathy: Tibiocalcaneal Arthrodesis with Hindfoot Nail Technique.

Charcot arthropathy presents as a debilitating condition marked by progressive joint deterioration, primarily afflicting the foot and ankle, resulting in the formation of distorted and unstable ankles. Typically, advanced deformities necessitate the use of external fixators and gradual correction to mitigate potential neurovascular complications. Here, we document the case of a 68-year-old woman with diabetes mellitus, hypertension, and end-stage renal failure, who exhibited painless progressive deformity of her right ankle over two years. Her mobility was severely impaired, relying on a wheelchair for movement. Clinical assessment revealed an 80-degree valgus deformity of the right ankle, accompanied by bony protrusions on the medial side, with dry skin but no ulceration noted. Radiographic examination depicted severe valgus deformity, complete talus destruction, distal fibula fracture, and loss of the lateral distal tibial plafond. She underwent tibiocalcaneal fusion using a hindfoot arthrodesis nail and iliac bone grafting during the consolidation and remodeling phase. Four months post-operation, radiographs indicated evidence of fusion, permitting partial weight-bearing with a walking frame. After one year, the patient regained ambulatory function without assistance, with radiographs confirming complete fusion. Notably, no complications such as skin or soft tissue infections, or neurovascular injuries were encountered. This case underscores the successful correction of severe ankle deformities and the restoration of a stable and functional foot in Charcot arthropathy patients through tibiocalcaneal arthrodesis employing a hindfoot nail.
Norliyana MAZLI (Kuala Lumpur, Malaysia), Mohd Yazid BAJURI, Nik Alif Azriq NIK ABDULLAH
00:00 - 00:00 #43010 - PO47 Osteochondral lesions of the talus treated with amic technique: long term results.
PO47 Osteochondral lesions of the talus treated with amic technique: long term results.

Introduction: Osteochondral lesions of the talus (OLT) are common findings following both acute ankle trauma and chronic ankle instability. In the most recent systematic reviews, the AMIC technique showed good results, providing significant improvement in patient outcome scores. Aim of this study is a clinical and radiologic 10 years follow-up of a series of patients treated with AMIC technique for OLTs. Materials and Methods: The study evaluated 19 patients who underwent surgery with AMIC technique between 2011 and 2015 for 20 osteochondral lesions of the talus. A clinical 10 years follow up included PROMS such as EFAS score, Foot Function Index (FFI) Manchester Oxford Foot Questionnaire (MOxFQ). The MOCART 2.0 score was used for the radiologic 10 years follow-up. Results: The PROMs showed the following results: EFAS: 19.750 (SD 4.644), MOxFQ: 9.550 (SD 12.992), FFI: 16.150 (SD 20.879), MOCART 2.0: 44.750 (SD 12.055). The results were compared with the data present in the literature and showed overlapping values. The Pearson correlation between the PROMs and the results of the MOCART 2.0 score was evaluated and none of the PROMS showed a significant correspondence with the MOCART 2.0 results. Conclusions: AMIC method has proven to be an effective treatment for OLTs at 10 years of follow-up. However, the PROMs values do not correspond to the MOCART 2.0 score.
Elena DELMASTRO (Milan, Italy), Manfred THOMAS
00:00 - 00:00 #43025 - PO48 Outcomes of total talus replacement using 3D-printed titanium prosthesis, a case series.
PO48 Outcomes of total talus replacement using 3D-printed titanium prosthesis, a case series.

Background Total talus replacement (TTR) has become a notable treatment option for patients with talar avascular necrosis (AVN). However, the effectiveness of pure titanium prostheses remains less explored. This study aims to evaluate the clinical outcomes of TTR using a pure titanium prosthesis. Methods From May 2021 to May 2024, 25 patients with talus AVN underwent TTR at Inha University Hospital using customized 3D-printed pure titanium prostheses (Cubelabs, Seoul). 14 patients with a follow-up period exceeding six months were included for analysis. Evaluations of clinical and radiological outcomes were conducted preoperatively and at 3, 6, 12, 24, and 36 months post-operation. Outcomes assessed included VAS, Foot Function Index (FFI), Foot and Ankle Outcome Score (FAOS), EQ-5D, and patient satisfaction. Data were analyzed using Wilcoxon signed rank tests. Results The average follow-up duration was 10.3 months (range, 6–36 months). Preoperative VAS pain scores averaging 8.27±0.81 decreased to 1.42±1.95 (range, 0-7) at final follow-up. FAOS significantly improved from 20.1±11.3 to 67.01 ± 20.9(P < 0.05), and FFI scores decreased from 83.8±10.1 to 21.51±17.58 (P<0.05). EQ-5D increased from 0.48±0.22 to 0.78±0.15. Range of motion improved from 37.1±20.7 degrees to 93.9±21.7degrees. 11 patients(76%) were very satisfied, 3 were satisfied(24%). No significant complications were reported. Conclusion: Short-term outcomes for TTR using pure titanium prostheses are promising, with significant improvements in pain and function without major complications. Extended follow-up is required to assess long-term outcomes and durability.
Bom Soo KIM (Incheon, Republic of Korea), Myung-Geun SONG
00:00 - 00:00 #43027 - PO49 Supramalleolar tibia osteotomies as ankle preservation surgery: our experience in a case series.
PO49 Supramalleolar tibia osteotomies as ankle preservation surgery: our experience in a case series.

Ankle joint-preserving surgery, specifically supramalleolar osteotomies (SMOT), is an effective therapeutic option for treating ankle osteoarthritis in young patients. There is a lack of evidence in the literature regarding its indications and, especially, mid to long-term outcomes. The objective of this study is to evaluate the functional and radiological results one year postoperatively and postoperative survival in a series of patients treated with SMOT. A retrospective study was conducted, including 18 patients (18 ankles) who underwent SMOT between 2018 and 2021. Radiological variables, such as the correction of the anterior tibial surface angle (TAS) one year postoperatively, were evaluated. To assess functional outcomes, we used the Manchester Oxford Foot Questionnaire (MOXFQ) and the visual analog scale (VAS) for pain, preoperatively and at the one-year follow-up. We also evaluated the survival of the osteotomy at the end of the follow-up. The mean follow-up time was 47 months (SD:9). In varus ankles, the preoperative TAS of 83° (SD: 2.6°) was corrected to 92° (SD:2.5°), achieving overcorrection in 37.5% of cases. In the valgus ankle group, the preoperative TAS of 93° (SD:3.4°) was corrected to a postoperative TAS of 85.3° (SD:6.1°), achieving overcorrection in 70% of cases. The survival rate of SMOT was 88% at 4 years of follow-up. Functionally, the mean VAS decreased from 58.2 (SD:16.9) to 35.67 (29.0) (p=0.05), and the MOXFQ showed statistically significant improvement in all domains (p<0.05). SMOT lead to good functional and radiological results one year after surgery, with high mid-term survival.
Jan MARTINEZ-LOZANO (Barcelona, Spain), Albert FONTANELLAS FES, Carlo GAMBA, Gemma GONZÁLEZ-LUCENA, Alberto GINÉS-CESPEDOSA
00:00 - 00:00 #43044 - PO50 The occurrence of Osteochondral Lesions of the Talus alongside Anterior Talofibular Ligament injuries, and the value of using clinical presentation to guide imaging decisions.
PO50 The occurrence of Osteochondral Lesions of the Talus alongside Anterior Talofibular Ligament injuries, and the value of using clinical presentation to guide imaging decisions.

Introduction: Low ankle sprains are a prevalent issue, often involving the anterior talofibular ligament (ATFL). While there is increasing attention on ligamentous injuries in ankle sprains, cartilaginous injuries are frequently overlooked. This article aims to (1) evaluate the significance of magnetic resonance imaging (MRI) in ATFL injuries to detect concurrent osteochondral lesions of talus (OLT) as well as associated ligamentous injuries; (2) determine the importance of clinical presentation and its correlations with risk of concomitant OLT in low ankle sprains. Material and Methods: We performed a retrospective analysis of 129 patients who underwent ATFL reconstruction. The patient data were reviewed to assess the incidence of OLT and other injuries concurrent with ATFL injury. Additionally, we examined the pre-operative clinical symptoms to identify any signs that could indicate the presence of OLT, prompting clinicians to consider a preoperative MRI scan for these subsets of patients. Results: A total of 31.8% (n=41) of patients with ATFL injuries of varying degrees were found to have concurrent OLT.. Further subset analysis of this group revealed that 78% (n=32) of these patients exhibited joint line tenderness, compared to 34.1% (n=30) of patients in the group without concurrent OLT. Of note, symptoms of instability appear to be comparable between both groups (75.6% with OLT vs 83% without OLT). Conclusion: This study concludes that patients with symptoms of joint line tenderness and chronic instability (>3months) should have a pre-operative MRI study as they are more likely to have concomitant OLT injury.
Dhivakaran GENGATHARAN (Singapore, Singapore), Walter WONG SOON YAW, Inderjeet Singh RIKHRAJ, Eric CHER WEI LIANG
00:00 - 00:00 #43054 - PO51 Rethinking surgical incisions for trimalleolar ankle fracture - a novel surgical technique.
PO51 Rethinking surgical incisions for trimalleolar ankle fracture - a novel surgical technique.

Introduction/ Purpose High energy tri-malleolar ankle fracture remains a challenge due to its propensity for wound complications. Commonly used postero-lateral and direct medial approach has its own drawbacks. The postero-lateral approach offers adequate visualisation of the deeper posterior malleolus but limited access to the fibula proximally and makes direct lateral plating difficult. Whereas the direct medial approach may lead to closure and wound complications as incisions are often directly over the fixation. This study proposes a new curvilinear incision for both the postero-lateral and medial approaches to overcome the challenges of exposure and wound healing. Methods On the medial malleolus, a curvilinear incision around the medial malleolus with a broad base posterior flap over angiosomes derived from posterior tibial artery(PTA) is designed. This allows full exposure and eventual flap coverage over the medial malleolus, without having the incisions centered over the implants. On the lateral malleolus, a curvilinear postero-lateral incision over fibular was designed based on the anterior perforating and calcaneal branches of peroneal artery(PA). This incision creates an anterior flap over the fibula distally. Outcomes measured in this series includes time to healing, wound related complications and need for surgical intervention. Results In our early series of five consecutive patients with closed tri-malleolar ankle fractures treated with a dual surgical incision, all of them required three malleolar fixations with plates and screws. Recovery for this group were uneventful, with no wound related complications that requires surgical interventions. All patients in this series exhibit excellent reduction and fixation radiographically.
Seng WONG (Singapore, Singapore), Jiajun FENG, Eric CHER
00:00 - 00:00 #43069 - PO52 The salto total ankle arthroplasty – clinical and radiological outcomes for a single-surgeon series of 102 patients at 11 years follow-up.
PO52 The salto total ankle arthroplasty – clinical and radiological outcomes for a single-surgeon series of 102 patients at 11 years follow-up.

Background: Total ankle arthroplasty (TAA) remains an excellent treatment option for end stage ankle osteoarthritis. We present the longer-term results of a modern design TAA. Methods: TAA was performed in 102 consecutive ankles (96 patients) in an independent, prospective, single-surgeon series. Implant survival, patient-reported outcome measures (PROMs) and radiographic outcomes are presented at a mean of 11 years (range 5-15 years). Results: Eighty-one ankles (77 patients) were included at an average age of 70 at the time of their operation. Eight of 81 ankles (10%) underwent revision or reoperation. Four were major revisions to fusion or revision TAA: one due to infection, one due to unexplained pain, and two due to migration of the talar component. Two other ankles underwent other revision operations – one liner exchange with a minimally-invasive heel-shift osteotomy for varus liner wear and one fractured liner was exchanged. Two ankles underwent re-operations: one had subtalar fusion and grafting for a cyst-related talar fracture, one required curettage and grafting for tibial bone cysts. With all-cause revision as an endpoint, implant survival was calculated using Kaplan-Meier curves as 92.4% at 5 years and 89.9% at 10 years. If a TAA survived to five years without revision, survival at ten years was 96.1%. Conclusions: This series demonstrates excellent radiographic and patient-reported outcomes for a modern-design TAA at 11 years with a revision rate similar to that previously published.
Max LITTLE (London, United Kingdom), Charlotte BINNIE, Iris KWOK, Derek EFFIOM, Jonathan SUPER, Peter ROSENFELD
00:00 - 00:00 #43083 - PO53 Ankle instability due to non-union of the external malleolus.
PO53 Ankle instability due to non-union of the external malleolus.

Infrasyndesmal ankle fractures are generally stable injuries that usually consolidate with conservative treatment with plaster. Avulsion fractures, even if they do not consolidate, are not usually clinically symptomatic, however, larger Weber A fractures can generate symptomatic instability in the patient. A 38-year-old male athlete came to the clinic with instability of the right ankle. He had an infrasyndesmal fracture of the right ankle 5 months ago that had not consolidated. On examination, he presented marked instability with walking, referring diffuse pain on the external side of the ankle and insecurity. During normal walking, he did not present symptoms, but during running he began to feel instability and pain. On examination, the non-union area was clearly palpable and painful. The hindfoot had a normal axis. X-rays showed an atrophic non-union of the external malleolus. We offered surgical management due to the instability during sports. Using a lateral approach, the area of pseudoarthrosis was located, refreshed and crest graft was provided. Then a compression hook plate was applied. The patient was left uncharged and immobilized with a suropedic splint for 6 weeks. After this, partial weight-bearing was authorized progressively. The patient evolved favorably and was asymptomatic 6 months after surgery with the fracture consolidated Generally, these fractures consolidate; those that do not, it is postulated that it may be due to anatomical variations in the blood supply of the external malleolus. Surgical management of symptomatic cases, open reduction and internal fixation together with bone graft, usually resolves the symptoms in most cases.
Juan MORENO BLANCO (, Spain), Pablo SIERRA MADRID, Araceli MENA ROSON, Maria Soledad PÉREZ ANTOÑANAZAS, Alberto PLASENCIA HURTADO DE MENDOZA, Óscar SERRANO ALONSO
00:00 - 00:00 #43085 - PO54 “Customize to achieve Perfection?” – Total Ankle Arthroplasty with Customized Cutting Guides – Case Series.
PO54 “Customize to achieve Perfection?” – Total Ankle Arthroplasty with Customized Cutting Guides – Case Series.

Tibiotarsal osteoarthritis is a highly disabling pathology, affecting 3.4% of the general population. When refractary to conservative treatment, the surgical approach varies between arthrodesis and arthroplasty, with arthrodesis being historically the preferred therapy. The emergence of modern implants has changed this paradigm. In recent studies, although arthroplasty continues to be associated with higher rates of complications, it has revealed excellent results in terms of mobility, functionality and implant survival. We present six cases of patients with tibiotarsal arthrosis who underwent total ankle arthroplasty with “QUANTUM Total Ankle prosthesis with OrthoPlanify - Patient Specific Instrumentation” in which preoperative images were used to produce 3D bone models and specific cutting guides. These are four females and two males, aged between 60 and 70 years, with an average AOFAS Ankle-Hindfoot Score of 33 / 100. All of them underwent total ankle arthroplasty with this system, between 2023 and 2024, in the same institution and by the same surgical team. During the follow-up period, there was a significant improvement in pain complaints, mobility and function, with an average gain in AOFAS Ankle-Hindfoot Score 40, with no complications recorded. Although it is not yet established as first line, new generations of ankle arthroplasty are changing the treatment of this patology. Total Ankle Arthroplasty with personalized cutting guides is designed to facilitate the procedure, decrease surgical time, improve mobility and increase stability based on patient's specific anatomy. More studies and follow-up time are needed to establish and confirm the advantages of this technique.
Margarida GOMES (Macedo de Cavaleiros, Portugal), José ARAÚJO, Carla CARREÇO, Rosana PINHEIRO, Diogo BARROS, Bárbara FERREIRA, Ana LAVADO, António ANDRADE
00:00 - 00:00 #43087 - PO55 Tibio Talar Calcaneal Arthrodesis as a Final Treatment of Failed Total Ankle Arthroplasty.
PO55 Tibio Talar Calcaneal Arthrodesis as a Final Treatment of Failed Total Ankle Arthroplasty.

Purpose: To present the surgical technique of tibio talar calcaneal (TTC) arthrodesis applied to failed total ankle arthroplasty (TAA) cases, highlighting variations in femoral head allografts. Material and Methods: This study involves four patients who underwent TTC fusion after failed TAA. The surgical technique consists of placing the patient laterally with a thigh tourniquet, performing a lateral ankle approach with fibular osteotomy, removing implants, debriding the wound, and achieving fusion with a retrograde intramedullary nail under fluoroscopic guidance. Differences among cases were in using femoral head allografts to address bone defects. In the first case, the femoral head allograft was placed en bloc. In the second case, the femoral head was split into two parts to fit the defect. In the third case, the femoral head was ground into cancellous chips to fill the void. The fourth case involved a more significant bone defect from total talus replacement, filled with ground femoral head chips. The postoperative protocol included immobilisation in a circular cast, non-weight-bearing for six weeks, followed by gradual weight-bearing until the 12th postoperative week. Results: The American Orthopaedic Foot and Ankle Society (AOFAS) scores increased in all cases, with no wound complications noted. Only one case, the one with the ground femoral head, had a delayed union. Conclusions: TTC arthrodesis is a salvage procedure for failed TAA. Femoral head allografts can be adapted based on specific case requirements. This technique requires expertise in foot surgery and thorough preoperative planning for successful outcomes.
Paschalis PAPANIKOLAOU (Naousa, Greece), Nerantzoula GOUTSIOU, Grigorios ANAGNOSTOU, Menelaos PAPADAKIS, Ioannis VASIADIS, Alexandros ELEFTHEROPOULOS
00:00 - 00:00 #43096 - PO56 Normative Contact Mechanics of the Ankle Joint: Quantitative Assessment Utilizing Bilateral Weightbearing CT Journal of Biomechanics.
PO56 Normative Contact Mechanics of the Ankle Joint: Quantitative Assessment Utilizing Bilateral Weightbearing CT Journal of Biomechanics.

Background: Alterations in ankle’s articular contact mechanics serve as one of the fundamental causes of significant pathology. Nevertheless, computationally intensive algorithms and lack of bilateral weightbearing imaging have rendered it difficult to investigate the normative articular contact stress and side-to-side differences. Purpose: The aims of our study were two-fold: 1) to determine and quantify the presence of side-to-side contact differences in healthy ankles and 2) to establish normative ranges for articular ankle contact parameters. Methods: In this retrospective comparative study, 50 subjects with healthy ankles on bilateral weight-bearing CT were confirmed eligible. Segmentation into 3D bony models was performed semi-automatically, and individualized cartilage layers were modelled based on a previously validated methodology. Contact mechanics were evaluated by using the mean and maximum contact stress of the tibiotalar articulation. Absolute and percentage reference range values were determined for the side-to-side difference. Results: Amongst a cohort of individuals devoid of ankle pathology, mean side-to-side variation in these measurements was < 12 %, while respective differences of > 17 % talar peak stress and > 31 % talar mean stress indicate abnormality. No significant differences were found between laterality in any of the evaluated contact parameters. Discussion: Understanding these values may promote a more accurate assessment of ankle joint biomechanics when distinguishing acceptable versus pathological contact mechanics in clinical practice.
Matthias PEIFFER (Ghent, Belgium), Samir GHANDOUR, Atta TASEH, Nour NASSOUR, Arne BURSSENS, Gregory WARYASZ, Lorena BEJARANO-PINEDA, Soheil ASHKANI-ESFAHANI, Emmanuel AUDENAERT, Christopher DIGIOVANNI
00:00 - 00:00 #43100 - PO57 All endoscopic Brostrom-Gould repair, technique and 5-year preliminary results.
PO57 All endoscopic Brostrom-Gould repair, technique and 5-year preliminary results.

Introduction: In lateral ligament ankle repair, the Brostrom-Gould procedure is still a gold standard. While studies showed the benefits of arthroscopy, they usually associate arthroscopic and percutaneous techniques to access the inferior bundle of the anterior talofibular ligament (ATFL), the calcaneofibular ligament (CFL) and the inferior extensor retinaculum (IER). The goal of this technique is to be true to the open one and to report our 5-year preliminary results. Materials and methods: Three portals are used: anterolateral and anteromedial for the anterior arthroscopy, lateral for the endoscopy. To access the extra-articular features, a working space is created with a probe through the anterolateral portal. Two soft anchors are passed through capsule, ligament and EIR. A prospective database for 43 active patients (mean age 29.4), with a 5-year minimum follow-up, that underwent the procedure, was reviewed. Results: All patients had ATFL grade 1 or 2 SFA classification. The AOFAS scores showed significant improvement from 69.6 ± 13.9 to 93.7± 10.7 and the Karlsson score improved from 59.7 ± 14.5 to 91.5 ± 14.5 at the final follow-up. Two thirds (74.4%) maintained or had improvement in the AAS at 5.41 ± 2.8 from 5.38 ± 2.8 with an average satisfaction rate of 9.1 ± 1.3. The instability recurrence was 7%. No surgical complications or reoperations occurred. Discussion and conclusion: This is the first study on all endoscopic technique with long terms results. The outcomes are excellent and maintain over time in athletes, as in open techniques, but with less complications and failure.
Choon Chiet Andrew HONG, Christel CHARPAIL (Bordeaux), Stéphane GUILLO
00:00 - 00:00 #43102 - PO58 Comparison of Complications and Cost of locking vs non-locking plates in lateral malleolus fractures in patients aged 60 and above.
PO58 Comparison of Complications and Cost of locking vs non-locking plates in lateral malleolus fractures in patients aged 60 and above.

Introduction Lateral malleolar fractures are the most common type of ankle fractures. Locking plates are increasingly used for surgical fixation of these displaced fractures, particularly in older patients. Biomechanical studies suggest these plates increase stability of the ankle joint. This study aims to analyse the complication rate, and cost difference between locking vs one-third tubular plates. Materials and methods Patients aged 60 and above who underwent surgical fixation for lateral malleolar fractures at our District General Hospital from 2019-2024 were included in this study. Data including operative fixation, plate used, complication rates, revision surgery and metalwork removal were collected from hospital records. Results A total of 42 patients were included for analysis. 57% of patients underwent fixation with locking plates and 48% with one-third tubular plates (n=18). Overall complication rate was 29% (n=12). There was no statistically significant difference in complication rate between locking and non-locking plates (p=1) or operating surgeon (foot and ankle vs other) (p=0.6987). Of the 3 diabetic patients, 2 experienced complications. Complications were categorised as early (largely due to wound issues) or late onset (mostly due to plate irritation). A total of 6 patients required further surgery. There was an estimated extra cost of £4974 for the use of locking plates during the study timeline. Conclusion There was no significant difference in overall complication rate between locking and non-locking plates used for lateral malleolar fracture fixation despite significantly higher costs of locking constructs. Further comparative studies are required to analyse the trends and demonstrate cost effectiveness.
Nabeela FAROOQ, Hamed MAZOOCHY (London, United Kingdom), Lakshmi VORUGANTI, Suresh CHANDRASHEKAR, Yaser GHANI
00:00 - 00:00 #43104 - PO59 Review of arthroscopic surgical options for talar dome osteochondral lesions repair.
PO59 Review of arthroscopic surgical options for talar dome osteochondral lesions repair.

Osteochondral lesions of talar dome are very common finding in various posttraumatic and atraumatic ankle conditions. It is extremely important to timely recognize and treat hyaline cartilage to prevent secondary osteoarthritis, alleviate pain, and improve patient function. The main clinical characteristics are deep ankle pain and swelling, and besides clinical examination, the diagnostic gold standard is MRI, which provides information on the size, depth, and stability of the lesion, the presence of subchondral cysts and bone marrow edema, and associated injuries such as ligament lesions, impingement, or malalignment. Arthroscopic techniques allow easy access and high-quality repair of all stages osteochondral lesions, with a lower risk of postoperative complications. Microfractures are a simple, inexpensive, and effective technique, suitable for defects up to 1 cm² and depths up to 3 mm, with the lack of final formation of fibrocartilaginous tissue. Autologous matrix-induced chondrogenesis (AMIC) is a technique intended for open surgery but can be performed arthroscopically with proper preparation. Suitable for larger defects, and compatible with bone grafting, with disadvantages of higher costs and technical complexity. The minced cartilage implantation technique has an indication spectrum similar to autologous chondrocyte implantation, allows the repair of larger, and combined with bone grafting, deeper defects. It is technically somewhat demanding but is single stage, completely biological, can be combined with ligament repairs and corrective osteotomies, has relatively low cost, and the potential to form hyaline cartilage. Given the high importance of preserving hyaline cartilage, it is essential to apply a wider range of repair techniques.
Borna STRAHONJA (Zagreb, Croatia), Hrvoje KLOBUČAR, Denis TRŠEK
00:00 - 00:00 #43108 - PO60 Runners have higher soleal tightness as compared to non-runners: a prospective case-control study.
PO60 Runners have higher soleal tightness as compared to non-runners: a prospective case-control study.

Background: Runners are at a higher risk of injury due to tightness in specific muscle groups, including the hamstrings, hip rotators, and calf muscles. Previous research has extensively explored the tightness of the gastrocnemius muscle in runners, which increases their susceptibility to injuries. However, limited studies have assessed soleal tightness in runners, warranting further investigation with larger sample sizes to understand its impact on running biomechanics and injury prevention. Methods: Sixty-three healthy adults (33 runners and 30 non-runners) were included in the study and gastrocnemius tightness was measured by ankle-foot dorsiflexion index (Silverskiold test). The relation between running mileage and intrinsic gastrocnemius tightness was obtained using linear regression analysis for each study group. Results: Mean ankle-foot dorsiflexion index (ADI) among runners and non-runners were found to be 10.66+6.04 and 13.25±7.57 respectively (P=0.03). Age, gender or side (left or right gastrocnemius) did not influence ADI. Muscle tightness was found to be inversely related to running distance. Conclusion: This study observed that runners have a higher Soleal Tightness as compared to non-runners. However, future studies with a larger sample size and targeted at professional athletes are required to substantiate the effect of Soleal tightness on running biomechanics.
Ankit DADRA (CHANDIGARH, India), Siddhartha SHARMA, Prasoon KUMAR, Sandeep PATEL, Karan JINDAL
00:00 - 00:00 #43118 - PO61 Personalized resurfacing: a game-changer on treating osteochondral lesions of talus?
PO61 Personalized resurfacing: a game-changer on treating osteochondral lesions of talus?

Osteochondral lesions of the talus (OLTs) are the most common cause of chronic deep ankle pain.They are characterized by damage to the cartilaginous and subchondral bone of the talar dome.These lesions can be a significant traumatic event or recurrent microtrauma.In current literature,there is still not enough evidence to make clear and strong guidelines for OLT treatment.Classically, operative treatment strategies could be divided into cartilage repair,cartilage regeneration and cartilagem replacement.In recent years personalized talus resurfacing is growing in popularity as a viable treatment option for OLTs and to make the link between biologics and conventional joint arthroplasty.Case report of a 36-year-old man, with a osteochondral lesion of talus treated with personalized resurfacing (Episealer) and review of literature.A 36-year-old male with an osteochondral lesion of the talus (Hepple stage 4) on MRI, underwent arthroscopy, which showed an osteochondral lesion of the talus in zones 1 and 4 and microfractures were performed. Six months post-operatively, the patient continued to experience medial ankle pain,and a new MRI showed persistence of the osteochondral lesion.The patient then underwent a personalized talus resurfacing with an Episealer implant.Currently,at two year post-operatively,the patient is asymptomatic,with complete implant integration and is performing his job without restrictions and recreational sports activity with good tolerance.The authors believe that this technique is effective and will gain increasing importance in the coming years.For this surgical technique and the use of these new implants to be safely implemented,a rigorous validation process and studies with longer follow-up are necessary.
Luís BARBOSA PINTO (Viseu, Portugal), Rui SOUSA, Simão PINHO, Marta LAGES, André CARVALHO, Luís MACHADO RODRIGUES
00:00 - 00:00 #43121 - PO62 An updated systematic review and meta-analysis of outcomes of open versus arthroscopic repair of lateral ankle ligament for lateral Ankle Instability.
PO62 An updated systematic review and meta-analysis of outcomes of open versus arthroscopic repair of lateral ankle ligament for lateral Ankle Instability.

Purpose: To perform a systematic review and meta-analysis to compare the outcomes of open versus arthroscopic repair. Methods: We performed primary electronic search across PubMed, Emabse, Scopus, and Cochrane Library databases, and looked for the comparative studies that evaluated the medial versus lateral approach in TKA for valgus knees. Statistical analyses were executed with RevMan-5.4.1. Results: This meta-analysis suggested a significant difference in Karlsson [MD 1.10; 95%CI 0.34,1.87; p=0.005] and JSSF scores [MD 1.86 ; 95% CI of 0.74,2.97; p=0.001], and talar tilt [MD 0.28; 95% CI 0.14-0.41; p<0.0001] in the open group compared to the arthroscopic repair group; however, our results failed to show a significant difference in terms of AOFAS scores [MD 0.56 (95% CI -0.06,1.18; p=0.08], overall complications [OR 0.81; 95% CI of 0.53-1.25, p=0.34], wound-related complications [OR 0.49; 95% CI of 0.22, 1.09; p=0.08], nerve injuries, knot pain, anterior drawer test, VAS score [MD -0.31; 95% CI -0.62, 0.00; p=0.05] and duration of surgery [MD -5.16; 95%CI -11.91,1.60; p=0.13] between the two procedures for the lateral ankle instability. Conclusion: Current evidence shows comparable outcomes and complications for lateral ankle instability repair either through arthroscopic or open repair.
Sandeep Kumar YADAV, Rajesh Kumar RAJNISH (India, India)
00:00 - 00:00 #43132 - PO63 Influence of Syndesmotic injury patterns on mid term functional and radiological outcomes in complex ankle fractures.
PO63 Influence of Syndesmotic injury patterns on mid term functional and radiological outcomes in complex ankle fractures.

Background Syndesmosis injury can be of a varying magnitude; little information exists about the influence of the degree of initial syndesmotic injury on functional outcomes and follow-up radiological parameters. Aims and Objectives: To identify and define morphological patterns of syndesmotic injury in ankle fractures according to a zone-based evaluation and correlate the initial degree of instability with mid-term functional and radiological outcomes. Design: Retrospective cohort study, to review a prospective question. Materials and methods:40 complex ankle fractures out of 120 ankle fractures met the inclusion criteria i.e. significant documented syndesmosis involvement needing stabilization. Injury characteristics and fracture morphology were noted and classified by validated classification systems. The syndesmosis was divided into 3 zones on axial Ct section, A, B, and C from anterior to posterior, and the degree of displacement and morphology was noted. The patients were evaluated at the final follow-up with OMS, MOXFq & SF-12 Results:22 patients had Zone A injury(widening,AITFL,Chaput,Wagstaff fractures). 22 patients had widening of ZoneB. ZoneC was involved in 30 patients. Fracture reduction was excellent in all 40 patients and syndesmosis was widened in 5 patients. There was no significant difference in outcome scores based on fracture types (SERvsPER), Posterior malleolus morphology, or based on zones of syndesmosis injury. Syndesmosis malreduction contributed to significantly poorer outcomes(SF-12,OMAS,MoxFQ) Conclusion:Despite a zonal classification of syndesmotic injury on CT and more clarity of injury patterns, we could not correlate the site and extent of syndesmotic injury with final functional and radiological outcomes.
Sandeep PATEL (Chandigarh, India, India), Siddhartha SHARMA, Mandeep DHILLON, Manjunath NISHANI
00:00 - 00:00 #43133 - PO64 Ankle fractures with Chaput fragment: A new classification system with insights into morphology and relation to surgical treatment.
PO64 Ankle fractures with Chaput fragment: A new classification system with insights into morphology and relation to surgical treatment.

Background:The Chaput fragment, a bony avulsion of the anterolateral margin of the distal tibia, is a less commonly discussed fracture pattern in ankle injuries. Its significance in ankle fractures and the optimal fixation technique remains unclear due to limited literature. This study aims to describe the morphology of ankle fractures with Chaput fragment and introduce a new classification system. Materials and methods: We retrospectively analyzed 33 patients with ankle fractures with associated Chaput fragment treated at our institute over a 3-year period. Data on patient demographics, fracture classification, surgical approach, and fixation method were collected, and a novel classification system for Chaput fragments was proposed. Results: Four distinct morphological types of Chaput fragment were identified (types 1–4), and three newer variants of trimalleolar fractures were identified (anterior, lateral, and medial variants). Type 1 refers to a small avulsion fragment attached to the anterior-inferior tibiofibular ligament; Type 2 is an anterolateral oblique type;Type 3 refers to an anterolateral fragment with extension into the medial malleolus and Type 4 is a comminuted Chaput fragment. Type 1 Chaput fragment was the most prevalent (60.6%), followed by Type 2 (24.3%), Type 4 (9.1%), and Type 3 (6.1%). The fixation methods ranged from screw fixation, plate fixation, and suture fixation to combinations of these techniques or even indirect stabilization with syndesmotic screws. Conclusion: Our new classification system based on morphology includes all possible variants of Chaput fracture. This preliminary data needs to be corroborated by more studies and validated by a larger number of observers
Sandeep PATEL (Chandigarh, India, India), Mandeep DHILLON, Siddhartha SHARMA
00:00 - 00:00 #43150 - PO65 Posterior ankle arthroscopy: Medial first technique.
PO65 Posterior ankle arthroscopy: Medial first technique.

Objective: Posterior ankle arthroscopy and hindfoot endoscopy have gained popularity since Van Dijk's introduction of the two-portal technique in 2000. Due to its complexity and higher risk of complications, it remains less common than anterior ankle arthroscopy. Van Dijk's series included 328 cases with a 2.3% complication rate. This study aims to develop a simpler and safer technique for posterior ankle arthroscopy, aiming to reduce complication rates and increase feasibility, based on the largest case series in the literature. Methods: This study included 424 cases of posterior ankle arthroscopy and hindfoot endoscopy performed from 2002 to 2024. We recorded both intraoperative and postoperative complications. Our technique employs standard posteromedial and posterolateral portals, with the posteromedial portal initially used as the viewing portal and the posterolateral portal as the working portal. The posteromedial portal is created near the Achilles tendon, with the trocar aimed toward the lateral malleolus, almost parallel to the ankle joint. Results: The patient cohort was 49.3% male and 50.7% female, with a mean age of 40.1 years (range 12-76). Nine complications were recorded, yielding an overall complication rate of 2.1%. Neurological complications constituted 4 (44.4%) of the complications (2 tibial nerve injuries, 1 tibial neuropraxia, 1 sural nerve dysesthesia). Other issues included 1 flexor hallucis longus (FHL) tendon injury, 2 superficial infections, 1 tibial artery injury, and 1 posterolateral portal cyst. Conclusion: Using the posteromedial portal for viewing and the posterolateral portal for working may reduce the risk of injury to neurovascular structures and the FHL tendon.
Abdurrahman VURAL, İbrahim KAYA, Resul BIRCAN, Mehmet Ali TOKGÖZ (Ankara, Turkey), Ahmet YILDIRIM, Ulunay KANATLI
00:00 - 00:00 #43155 - PO66 Ligamentous Ankle Lesions in Relation to the Morphometrics of the Incisura Fibularis: A Systematic Review.
PO66 Ligamentous Ankle Lesions in Relation to the Morphometrics of the Incisura Fibularis: A Systematic Review.

Background: The incisura fibularis (IF) provides intrinsic stability to the ankle joint complex by interlocking the distal tibia and fibula, but the role in ankle injuries is unclear. Therefore, we systematically reviewed all literature focused on the relation between ligamentous ankle lesions and IF morphometrics. Methods: A systematic literature search was conducted according to the PRISMA guidelines and registered on PROSPERO (CRD42021282862). In general, search terms were related to ankle and syndesmosis trauma/instability in combination with anatomical morphometrics of the incisura fibularis. Studies categorizable as original research (RCT or observational) were included. Studies concerning degenerative ankle disease and cadavers were excluded. The Hawker instrument was used to assess the methodological quality. Results: Sixteen studies were confirmed eligible and consisted of a prospective cohort (n=1), retrospective comparative (n=10), and observational (n=5) study design.Several studies (n=5) identified a correlation between a shallow IF depth and a higher incidence of ankle injury. A significant difference has also been found concerning the incisura height and angle (n=3): a shorter incisura and more obtuse angle have been noted in patients with ankle sprains. The mean Hawker score of the included studies was 28 out of 36 (range=24-31). Conclusion: The majority of the identified studies found distinct morphometrics of the IF in association with ligamentous ankle lesions. However, a substantial number of studies could not identify a clear association and presented a heterogeneous methodological quality. Therefore, further prospective studies are warranted to assess the relation between the incisura morphometrics and ligamentous disorders of the ankle joint.
Louise WITTOUCK (Gent, Belgium), Ruben VERMEIR, Matthias PEIFFER, Wouter HUYSSE, Nicolo MARTINELLI, Kris BUEDTS, Emmanuel AUDENAERT, Arne BURSSENS
Added to your list of favorites
Deleted from your list of favorites
EPOSTERS2
00:00 - 00:00

EPOSTERS DISPLAYED - FOREFOOT

00:00 - 00:00 #40836 - PO67 Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate in chondral defects of the 1st metatarsophalangeal joint - 5-year followup.
PO67 Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate in chondral defects of the 1st metatarsophalangeal joint - 5-year followup.

Introduction/Purpose The aim of the study was to assess the 5-year-follow-up (5FU) after Autologous Matrix Induced Chondrogenesis plus Peripheral Blood Concentrate (AMIC+PBC) in chondral defects at the first metatarsophalangeal joint (MTP1). Methods In a prospective consecutive non-controlled clinical follow-up study, all patients with chondral lesion at MTP1 treated with AMIC+PBC from July 17, 2016 to May 31, 2017 were included. Size and location of the chondral lesions, the Visual-Analogue-Scale Foot and Ankle (VAS FA) and the EFAS Score before treatment and at 5FU were analysed and compared with previous 2-year-follow-up (2FU). Peripheral Blood Concentrate (PBC) was used to impregnate a collagen I/III matrix (Chondro-Gide, Wolhusen, Switzerland) that was fixed into the chondral lesion with fibrin glue. Results One hundred and ninety-eight patients with 238 chondral defects were included. In 21% of patients no deformities in the forefoot were registered. The average degree of osteoarthritis was 2.2. The chondral defect size was 1.0 cm2 on average. The most common location was metatarsal dorsal (33%), and in most patients one defect was registered (74%). Corrective osteotomy of the first metatarsal was performed in 79%. 176 (89%)/164 (83%) patients completed 2FU/5FU. VAS FA/EFAS Score were preoperatively 46.8/11.9 and improved to 74.1/17.1 at 2FU and 75.0/17.3 at 5FU on average. No parameter significantly differed between 2FU and 5FU. Conclusion AMIC+PBC as treatment for chondral defects at MTP1 as part of joint preserving surgery led to improved and high validated outcome scores at 2FU and 5FU. The results between 2FU and 5FU did not differ.
Martinus RICHTER (Rummelsberg, Germany), Stefan ZECH, Issam NAEF, Stefan A MEISSNER
00:00 - 00:00 #40838 - PO68 Comparison total joint replacement with arthrodesis of the 1st metatarsophalangeal joint.
PO68 Comparison total joint replacement with arthrodesis of the 1st metatarsophalangeal joint.

Background The aim of this study was to compare outcome (clinical, patient-reported outcome measures, radiological, joint motion and pedographic) of total joint replacement with Roto-Glide (Implants International, Cleveland, UK) (RG) and arthrodesis (A) of the first metatarsophalangeal joint (MTP1). Methods All patients that completed follow-up (FU) of at least 24 months after RG and A before May 1, 2022 were included in the study. Preoperatively and at FU, radiographs and/or weight-bearing computed tomographies (WBCT) were obtained. European Foot and Ankle Society Score (EFAS Score), MTP1 range of motion for dorsi-/plantarflexion (DF/PF) were registered and compared pre-operatively and FU. Results Seventy RG and 72 A were included. Preoperative VASFA/EFAS Score did not differ between RG and A (Average scores, VASFA, RG/A, 50.6/45,6; EFAS Score, RG/A, 10,7/10,6; each p>0.05). Wound healing delays without further operative measures were registered in 4 (6%) patients for RG and 5 (7%) for A (p=0.67), and 5 revisions in 5 (7%) for RG and 12 in 8 (11%) for A (p=0.05). The longest available FU was higher in RG than in A (RG/A, 47/37 months on average, p<0.001). VASFA/EFAS Score at FU was higher in RG than in A (Average scores, VASFA, RG/A, 72,6/63,6; EFAS Score, RG/A, 16.1/14.1; each p<0.05). DF/PF was higher in RG than in A (Average values DF/PF RG, 36.1/14.0, A 0/0, p<0.001) Conclusion RG showed lower revision rate and higher PROMs, better joint motion (DF/PF) and more physiologic force distribution than at longer FU than A. RG is a valuable alternative for A.
Martinus RICHTER (Rummelsberg, Germany), Stefan ZECH, Issam NAEF, Stefan A MEISSNER
00:00 - 00:00 #40853 - PO69 The Comparison of Clinical Outcomes between Plantar Versus Dorsal Approaches in Morton's Neuroma Excision: A Systematic Review and Meta-Analysis.
PO69 The Comparison of Clinical Outcomes between Plantar Versus Dorsal Approaches in Morton's Neuroma Excision: A Systematic Review and Meta-Analysis.

Background: Current literature lacks comprehensive information comparing the clinical outcomes of plantar and dorsal approaches for Morton's neuroma excision. This systematic review and meta-analysis was conducted to evaluate and compare the clinical outcomes of neurectomy for Morton's neuroma, focusing on the differences between the plantar and dorsal approach. Methods: Our comprehensive literature review adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and utilized databases including PubMed, Embase, Web of Science, and the Cochrane Library. Data investigated in this study included postoperative sensory loss, scar tenderness, reoperation, histopathology, complications, pain score, patient satisfaction, functional scores, and time to weight bearing. Results: Total eight studies were included in this study. In aggregate, 237 neuromas underwent excision using the plantar approach, while 312 neuromas were treated via the dorsal approach. A significantly higher rate of postoperative reduced sensory was found in the dorsal group: 48.5% (64/132) Vs. 62.0% (80/129) with the relative ratio (RR) of 0.79 (95% CI, 0.64-0.97). A significantly higher rate of postoperative scar tenderness was noted in the plantar group: 16.7% (32/192) Vs. 6.2% (14/225) with the RR of 2.27 (95% CI, 1.28-4.04). Regarding the histopathology, 99.3% (143/144) and 97.1% (134/138) accuracy rate was confirmed in the plantar approach and dorsal approach, respectively, with the RR of 1.02 (95% CI, 0.98-1.07). Conclusions: This study compared postoperative outcomes following Morton’s neuroma excision between the dorsal and plantar approach. We recommend detailed discussions with patients prior to surgery to weigh the advantages and disadvantages of each approach.
Wonyong LEE (Sayre, PA, USA, USA), John MCDONALD, Mohammad AZAM, Andrew LACHANCE
00:00 - 00:00 #40892 - PO70 The position, orientation, and relative size of the fibularis longus tubercle in normal patients – a weightbearing CT assessment.
PO70 The position, orientation, and relative size of the fibularis longus tubercle in normal patients – a weightbearing CT assessment.

Background: The fibularis longus (FL) attaches to the base of the first metatarsal at the fibularis/peroneus longus tubercle (FLT/PLT). Differences in FLT morphology may reflect changes in FL function. This study aims to define the normal limits of FLT position, orientation, and size in patients with morphologically normal foot anatomy. Methods: A retrospective analysis of 131 feet without deformity in 72 patients undergoing weightbearing CT (WBCT) was conducted. Measurements included tubercle-floor distance, tubercle-metatarsal angle, and bisecting angle. Roundness of the FLT was assessed by the triangular ratio. Relative sizes of FLT to the first metatarsal (X/Y ratio) and first metatarsal to second metatarsal (XY/Z ratio) were also determined. Results: No significant side-to-side differences were found (p>0.05). Mean values were: tubercle-floor distance 28.02 ±2.63mm, tubercle-metatarsal angle 32.7 ±6.32 degrees, bisecting angle 65.58 ±6.27 degrees, triangular ratio 0.69 ±0.04, X/Y ratio 1.13 ±0.20, and XY/Z ratio 3.44 ±-0.72. Bisecting angle strongly correlated with tubercle-metatarsal angle (r = 0.840, p<0.001), indicating FLT rotation independent of foot position. ICC was >0.943 for all measurements. Conclusion: This study provides normative data on FLT morphology in individuals with normal feet. These findings can aid future studies investigating differences in patients with foot pathology, enhancing our understanding of FL's role in foot disorder development and treatment.
Amir Hossain GAHANBANI ARDAKANI, Branavan RUDRAN, Howard STRINGER, Matthew WELCK, Lyndon MASON, Karan MALHOTRA (London, United Kingdom)
00:00 - 00:00 #40917 - PO71 Surgical Correction of Hallux Valgus Deformity with Co-Inciting Metatarsus Adductus: A Systematic Review.
PO71 Surgical Correction of Hallux Valgus Deformity with Co-Inciting Metatarsus Adductus: A Systematic Review.

INTRODUCTION: Metatarsus adductus (MA) is a condition characterized as medial deviation of the forefoot with normal alignment of the hindfoot. While MA typically resolves spontaneously, its persistence can exacerbate HV deformity, complicating surgical correction. There is limited literature on the postoperative outcomes following corrective surgery for HV with coexisting MA. METHODS: A systematic review was conducted evaluating retrospective observational studies on surgical correction of HV in patients with concomitant MA. Inclusion criteria comprised: (1) patients diagnosed with both hallux valgus and metatarsus adductus, (2) studies including at least 5 consecutive patients, (3) a clear description of the surgical technique, and (4) reporting of clinical and radiographic outcomes. The quality assessment was performed using the Modified Coleman Methodology Score (mCMS). RESULTS: Thirteen studies describing 1120 surgeries met the inclusion criteria. The median follow-up duration was 20 months (12-114) and included patients had metatarsus adductus angles ranging from 14 to 23 degrees. There was a mean improvement of 7.6 degrees (3.86-10.10) in the intermetatarsal angle and 36.1 degrees (27.8-47.2) for the hallux valgus angle. Post-operatively, there was an average improvement of 36.8 points in the American Orthopedic Foot and Ankle Score. Recurrence of hallux valgus deformity was the most reported post-operative complication, averaging 18% across the included studies. CONCLUSION: Clinical and radiographic outcomes of hallux valgus correction in patients with MA appear comparable to those without this comorbidity. However, the rate of deformity recurrence was higher in patients with MA than those without as reported in the literature.
Dino FANFAN (Miami, USA), Nicholas DENOVE, Christian GUEVARA, Cary CHAPMAN, Daniel MURRAY
00:00 - 00:00 #40918 - PO72 Radiographic and Clinical Results of Minimally Invasive Transverse Distal 1st Metatarsal and Akin Osteotomies for Symptomatic Hallux Valgus.
PO72 Radiographic and Clinical Results of Minimally Invasive Transverse Distal 1st Metatarsal and Akin Osteotomies for Symptomatic Hallux Valgus.

Introduction: This study reports radiographic and clinical results on patients who underwent minimally invasive transverse distal 1st metatarsal and Akin osteotomies. Methods: 192 consecutive patients (213 feet) were followed for at least one year. The average age was 56.5, average final follow-up of 13.4 months, and 86.5% (166) of patients were women. Radiographic outcomes include pre- and post-operative HV (HVA), intermetatarsal (IMA), and proximal intermetatarsal angles (pIMA). Foot and Ankle Ability Measure (FAAM) and Visual Analog Scale (VAS) scores were used to determine functional outcomes. Complication, reoperation and radiographic recurrence rates were also determined. Radiographic recurrence was defined as a change in HVA >10 degrees. Results: Additional procedures were performed on 83 feet (39%), the most common being lesser metatarsal osteotomies, which was performed in 88% of those patients. Among corrected bunions, 8.5% were classified as severe (HVA >40 degrees) and 79% were moderate (HVA >20 and <40 degrees). Average pre-op HVA and IMA were 28.4 and 12.8 degrees and improved to 8.4 and 4.2 degrees (p < 0.001). Statistically significant increases in FAAM-ADL, FAAM-Sports and VAS scores were observed (p < 0.001). There were no cases of superficial or deep infections. There were 10 radiographic recurrences, and 13 (6%) hardware removals. Conclusion: Fourth generation MIS HV surgery for the treatment of moderate and severe HV showed good clinical and radiographical outcomes. This technique has also proven to be safe and effective, with low recurrence, revision and complication rates.
Dino FANFAN (Miami, USA), Christian GUEVARA, George TODD, Daniel MURRAY, Thomas SAN GIOVANNI, Christopher HODGKINS, Cary CHAPMAN
00:00 - 00:00 #40920 - PO73 Radiographic Evaluation of Time to Union in Minimally Invasive Hallux Valgus Correction.
PO73 Radiographic Evaluation of Time to Union in Minimally Invasive Hallux Valgus Correction.

INTRODUCTION: There is limited literature on the time to union following moderate and severe hallux valgus repair using minimally invasive techniques. We conducted a retrospective analysis to investigate the time to union and its relationship with cortical formation and post-operative degree of displacement of the 1st metatarsal in patients undergoing HV repair. METHODS: We retrospectively analyzed seventy-two consecutive patients with moderate to severe hallux valgus who underwent MIS 1st distal metatarsal and Akin osteotomy between 2019 and 2022. Radiographic measurements included the scale of displacement between the proximal and distal portions of the first metatarsal and the degree of cortex formation. Complete union was defined as the presence of three new cortex on postoperative X-ray films. RESULTS: On average, 2 cortices were observed at 16.9 weeks, and 3 cortices were observed at 26.8 weeks. When the metatarsal shift was greater than 50%, two cortices were observed at an average of 20.14 weeks, compared to 13.7 weeks when the shift was less than 30% (p=0.004). Further analysis of the time required to observe 3 cortices showed no statistically significant difference between metatarsal shifts greater (25.26 weeks) and less than (23.74 weeks) 50% (p=0.4734). In all patients, 4 cortices at the 6-month and 12-month time points. DISCUSSION: In patients who underwent MIS 1st metatarsal distal transverse and Akin osteotomies for HV repair, the degree of displacement between the proximal and distal portions of the 1st metatarsal is not associated with statistically significant delay in new cortical formation.
Dino FANFAN (Miami, USA), Daniel MURRAY, Christian GUEVARA, Christopher HODGKINS, Thomas SAN GIOVANNI, Cary CHAPMAN
00:00 - 00:00 #40942 - PO74 Hallux rigidus treatment: we prefer interpositional arthroplasty of the first MTP joint.
PO74 Hallux rigidus treatment: we prefer interpositional arthroplasty of the first MTP joint.

Background: Hallux rigidus of the 1MTP is the one of the most common forms of arthritis of the foot. In our opinion the interpositional arthroplasty is almost always an alternative to the fusion especially for active patients. The purpose of our study is to report the follow-up of a joint preservation, using allogenic Dura-Mater. Materials and methods: We used human allogenic Dura Mater in 80 patients from 2016 to 2023 as an interpositional graft. Also, if it was necessary to decompress the joint, we performed a shortening osteotomy of the first metatarsal bone. There were 25 male and 55 female, aged from 34 to 76 years. Analysis included clinical evaluation with the AOFAS Score and radiographic assessment. The average follow-up was 5 years. Results: The average preoperative AOFAS score was 34 (range, 30–41). The most recent AOFAS was 65.8 (range, 58–68). Preoperative dorsiflexion was 8–10◦ and 25◦ – postoperative, plantar flexion – 9◦ preoperative, and 15◦ – postoperative. There were no wound healing problems. There were no subsequent procedures or fusions performed on the 1 MTP joint. Every patient was satisfied with the surgical results. Conclusion: arthroplasty of the 1MTP Joint, using allogenic Dura Mater led to reliable pain relief and increasing the ROM. Moreover, the women have been able to wear stylish shoes with variable heel heights. We believe that this technique is an alternative to fusion of the joint.
Kirill MIKHAYLOV (Saint-Petersburg, Russia), Alexander BULATOV, David PLIEV, Maxim GUATSAEV
00:00 - 00:00 #41745 - PO75 Influence of mood on the outcome of hallux valgus surgery.
PO75 Influence of mood on the outcome of hallux valgus surgery.

Introduction Numerous studies have shown that surgical correction of HV is associated with improvements in scores on questionnaires assessing pain and general satisfaction in patients undergoing treatment for mood disorders. However, these results are not as good as in patients without depressive symptoms. Material and methods A retrospective study was carried out to compare the satisfaction with post-surgical outcomes in two groups of 35 patients. They underwent surgery for HV with the Scarf+Akin technique by the same surgeon, using the validated SF-12 and MOXFQ questionnaires. Results The two groups studied were homogeneous in terms of gender distribution, age and comorbidities studied (hypertension, diabetes mellitus and hypercholesterolaemia). Statistically significant differences were observed in the results of the SF-12 questionnaire (SF-12 (p<0,0001),and MOFQX (p=0,03); these showed a worse perception of the results after hallux valgus surgery in those patients taking antidepressants. Conclusion The results of this study are consistent with those of previously published studies, observing that the results in terms of satisfaction with post-surgical outcomes of HV and residual pain are worse in patients who suffer from mood disorders and require treatment with antidepressant and/or anxiolytic drugs.
Jaime A SÁNCHEZ LÁZARO (León, Spain), Fátima JUAN MANGAS, Ana R TRAPOTE CUBILLAS, Francisco J MADERA GONZÁLEZ, Óscar FERNÁNDEZ HERNÁNDEZ
00:00 - 00:00 #42107 - PO76 Mid-term outcome of distal osteotomy and first tarsometatarsal joint fusion for hallux valgus.
PO76 Mid-term outcome of distal osteotomy and first tarsometatarsal joint fusion for hallux valgus.

Objectives:Many surgical methods have been described for correction of hallux valgus (HV),in general dictated by the severity of the deformity.The aim of the study was to evaluate mid-term outcome of patients with distal chevron osteotomy and Lapidus arthrodesis.Methods:A retrospective study of patients operated in the hospital from January 2017 to December 2018, was conducted.Two groups were identified:distal chevron osteotomy (group A) and Lapidus arthrodesis (group B).Pre-operative and mid-term postoperative radiological examination results and patient`s satisfaction were analyzed.Results:Mid-term outcome was evaluated in 49 patients(48female,1male),mean age 55.8(31-77)years,mean 63(45-81)months after operation.18 patients(24 feet)were in the group A,31 patient(35 feet)in group B.In the group A pre-operative mean hallux valgus angle(HVA)was 32.4 degrees, intermetatarsal angle (IMA) 11.5degrees,distal metatarsal articular angle(DMAA)29.5degrees;postoperative mean HVA was19.8degrees,IMA 9degrees,DMAA 16degrees(p<0.05).Mean grade of the medial sesamoid position pre-operatively was 2,postoperatively 1.In the Lapidus arthrodesis group pre-operative mean HVA was 38.1degrees,IMA 15degrees,MAA 34.1degrees;postoperative mean HVA was 16degrees,IMA 8.6degrees,DMAA 14.1degrees(p<0.05).Mean grade of the medial sesamoid position pre-operatively was2,postoperatively2.No significant difference among mean postoperative HVA,IMA,DMAA in group A and group B was identified(p˃0.05).In group A 14 patients(77.8%)were satisfied,4 patients (22.2%)were unsatisfied;in group B 23 patients(74.2%)were satisfied,8 patients were unsatisfied(25.8%)with outcome.Two patients had superficial postoperative infection,one hypertrophic scar,one metatarsalgia,one stiffness. Discussion/conclusions: Both HV patient`s groups demonstrated improvement of HVA,IMA,DMAA postoperatively. Two thirds of patients were satisfied with outcome in both groups.Patients are suggested to be informed about possible complications and risks after surgery.
Evita RUMBA (Kuldiga, Latvia), Erika STURMANE, Alma EGLE, Ruta JAKUŠONOKA, Zane PAVĀRE
00:00 - 00:00 #42603 - PO77 Does the Type of Peroneus Longus Insertion Relate to the Development of Hallux Valgus? An Anatomical Cadaveric Study.
PO77 Does the Type of Peroneus Longus Insertion Relate to the Development of Hallux Valgus? An Anatomical Cadaveric Study.

Introduction: Hallux valgus (HV) is a complex multifactorial deformity of the first ray. Peroneus longus (PL) muscle is a key dynamic stabiliser of the first ray. Our theory is that HV individuals will have a different morphology of their PL insertion. Aim: To assess if there is an association between the type of PL insertion and the prevalence of HV. Methodology: Twenty-five cadaveric foot specimens were dissected to expose the insertion of PL. The head of the first metatarsal was exposed to determine the presence of morphological changes in keeping with HV. The type of PL insertion, anatomical HV status and number of tarsometatarsal (TMT) facets were all documented. Results: Seven specimens (28%) had morphological changes in keeping with HV deformity. Regarding number of insertions, there were 4 double insertions, which none had HV, whereas 33.33% (7/21) of the single insertions had evidence of HV. Regarding width of insertion to the peroneus longus tubercle, 15.38% (2/13) narrow insertions had HV, whereas 41.67% (5/12) had broad insertions. There were 2 unifacet TMT joints, 19 bifacet and 4 trifacet. HV was more common in the bifacet TMT joints (31.58%, 6/19). Conclusion: Patients with HV were more likely to have single and broad PL insertions. The pull of a narrow PL insertion may increase the stress concentration therefore having a greater effect to the lateral and downward movement of the first ray, thus preventing HV. Further research is required to understand if the morphology change is a cause or effect relationship.
Abdul GOMAA, Vasileios LAMPRIDIS (UK, United Kingdom), L HULLS, A RASELL-WATSON, Lyndon MASON, Alastair BOND
00:00 - 00:00 #42606 - PO78 THE MARQUETRY TECHNIQUE FOR FAILED FIRST METATARSOPHALANGEAL JOINT FUSION.
PO78 THE MARQUETRY TECHNIQUE FOR FAILED FIRST METATARSOPHALANGEAL JOINT FUSION.

Background: In the setting of revision surgery for failed primary first metatarsal-phalangeal joint (MTP1) arthrodesis, either autograft bone-block (harvested from iliac crest, tibia or calcaneus) or allograft bone graft interposition procedures have been proposed. The aim of the study was to report the clinical and radiographic results in patients undergoing revision MTP1 arthrodesis surgery with autologous first metatarsal bone graft (marquetry bone-block) as a revision procedure after failed primary arthrodesis with limited bone loss. Methods: Between February 2022 and February 2023 seven patients have been treated by the senior author with this technique. Four patients had single failure of MTP1 arthrodesis with limited bone loss. Two patients had hallux elevatus and varus after poor MTP1 fusion. The mean age at surgery was 64,8 years (range 56–71) with six females and one male. Clinical and radiological fusion was assessed at 12 weeks (range 12 – 15). AOFAS score and radiological measurements of length of the hallux (LOH) were also assessed. Results: All patients achieved pain relief and clinical fusion at 12 weeks (12-15) from surgery. There were no major complications. LOH decreased slightly (average length loss: 2 mm) in case of single failure of prior arthrodesis (range -1- -3). LOH increased after elevatus and varus correction (LOH increased of at least 7 mm). Conclusion: Autologous first metatarsal bone graft (marquetry bone-block technique) is a useful option for for managing failed primary arthrodesis with limited bone loss and deformity of the hallux.
Giovanni TISO, Iñaki MEDIAVILLA (BILBAO, Spain), Mikel ARAMBERRI, Anton AGUIRRE
00:00 - 00:00 #42624 - PO79 DEPENDENT TREATMENT OUTCOMES IN MORTON’S NEUROMA: A COMPARATIVE ANALYSIS OF INJECTION AND SURGICAL INTERVENTIONS.
PO79 DEPENDENT TREATMENT OUTCOMES IN MORTON’S NEUROMA: A COMPARATIVE ANALYSIS OF INJECTION AND SURGICAL INTERVENTIONS.

Background: Morton's neuroma is a painful foot condition characterized by tissue thickening around the nerves leading to the toes. The primary treatments include corticosteroid injections and surgical excision, with treatment decisions often influenced by the neuroma size. However, there is limited clarity on optimal treatment approaches based on this size. Methods: This retrospective observational study analyzed data from patients with Morton's neuroma treated at our district general hospital. Neuroma sizes, treatment modalities (corticosteroid injections or surgery), and treatment outcomes were examined. The treatment protocols involved corticosteroid injections initially, and surgical excision for those not responding to conservative treatment or with large neuromas. Outcome measures included treatment distribution by neuroma size, success rates of treatments, average neuroma size leading to surgery, and neuroma count per foot. Results: The study found that smaller neuromas (0-10 mm) were primarily treated with injections, while larger ones increasingly required surgery. Neuromas measuring around 9.21 mm, on average, often necessitated surgical intervention, indicating a possible size threshold. Around 88.24% of patients with neuromas more than 9mm had success with injections primarily but required surgery later on with surgical success around 55%. Most patients had one or two neuromas per foot, with a few having multiple neuromas. Conclusion: Neuroma size significantly influences the choice and outcome of treatment for Morton's neuroma. Smaller neuromas are responsive to conservative treatment, whereas larger neuromas may necessitate surgery. Clinicians should tailor treatment strategies based on neuroma size to optimize outcomes and further refine treatment thresholds.
Prajwal SRINIVASAN, Jordi BALLESTER, Raam Mohan SELVARAJAN (Liverpool, United Kingdom), Gerald TAN, Max ROSS
00:00 - 00:00 #42628 - PO80 Meniscal-like tissue in the metatarsophalangeal joint of the first ray.
PO80 Meniscal-like tissue in the metatarsophalangeal joint of the first ray.

Hallux valgus (HV) is the most frequent deformity of the forefoot, the etiology of which remains incompletely elucidated. Morphologic risk factors are well described but the importance of soft tissues, among others medial structures, should be emphasized in the development of this deformity. During corrective surgery for HV, a fibrous structure akin to a meniscus is often seen in the metatarsophalangeal joint of the first ray. This study aimed to histologically describe this structure and compare it to the knee meniscus. We conducted a monocentric retrospective study based on 37 feet of 32 patients. Feet included presented with an intra-articular fibrous tissue during surgeries requiring a medial arthrotomy of the first metatarsophalangeal joint. Histological samples were analyzed, and comparison was made with histological samples of degenerative and injured knee menisci. Histologic analysis showed a fibrocartilaginous tissue similar to the meniscal tissue of the knee in 97.3% of cases. The tissue was fibro-chondroid connective tissue in 64.9% of the cases with the presence of collagen fibers and chondrocytes. This tissue was not intact with fissures or micro-fissures present in 89.2% of the cases. We confirmed the histological similarity of the tissue found inside the metatarsophalangeal joint with the knee meniscus. Lesions were of mechanical type without any inflammatory reaction. In the light of our findings and previous studies, it seems that this structure suffers mechanical damages as the deformity progresses. We recommend its removal in hallux valgus corrective surgery.
Laetitia THEUNISSEN, Julien LABORDE, Céline FERNANDO, Michel MOREAU, François LINTZ (Toulouse)
00:00 - 00:00 #42758 - PO81 Percutaneous vs open first metatarsophalangeal joint arthrodesis: a proportional meta-analysis and systematic review.
PO81 Percutaneous vs open first metatarsophalangeal joint arthrodesis: a proportional meta-analysis and systematic review.

OBJECTIVE: First metatarsophalangeal joint (MTPJ-1) arthrodesis (MTPJA-1) is the gold standard to treat end-stage osteoarthritis of this joint. The purpose of this study was to determine whether percutaneous techniques to perform MTPJA-1 might reduce the nonunion, complication and reoperation rate as compared to the open approach. METHODS: Following the PRISMA checklist,different databases were searched, including studies reporting patients affected by MTPJ-1 osteoarthritis and undergone MTPJA-1 stabilized using crossed screws as exclusive fixation method. Data were harvested regarding the cohort , the study design, the surgical technique and the final outcome at the longest follow-up. The MINORS was used to assess the methodological quality of studies. The percutaneous (PERC) and the open (OPEN) techniques were compared in terms of nonunion, complication and reoperation rate. RESULTS: Nine studies (225 MTPJA-1 in 211 patients) were selected (PERC=130 cases, OPEN=95). In the two groups, the mean (±SD) sample size (26.6±5.1 cases in PERC, 23.7±10.2 in OPEN; p=0.33), mean age of patients (62±5.4 and 59.5±5.4 years,; p=0.26), sex distribution (81%±0.6 vs 57%±0.2 females,; p=0.17) and length of follow-up (20.8±11.6 months vs 29.5±16.8 months, p=0.19) were comparable. The pooled nonunion rate (5% in PERC vs 6% in OPEN; p=0.93), complication rate (4% vs 17%; p=0.24) and reoperation rate (3% vs 5%; p=0.74) were not significantly different. The quality of studies was moderate in the two groups (MINORS 9±1.3 points in PERC vs,11.7±3.7 in OPEN; p=0.19). CONCLUSIONS: The nonunion, complication and reoperation rate after percutaneous or open MTPJ-1 arthrodesis stabilized using two screws are not significantly different.
Antonio IZZO, Alessio BERNASCONI (Napoli, Italy)
00:00 - 00:00 #42798 - PO82 Is it necessary to modify the hallux valgus algorithm based on flat feet? the importance of double correction.
PO82 Is it necessary to modify the hallux valgus algorithm based on flat feet? the importance of double correction.

The objective of this study is to assess the effectiveness of calcaneal medializing osteotomy in patients with hallux valgus and symptomatic flat feet. Material and methods We conducted a retrospective cohort study. 2 groups of patients with hallux valgus and flat feet grade IIA and B: Group 1, operated by scarf and medializing osteotomy between 2016 and 2022. N 36. Average age 63 years. Mean Meary-Angle -18, angle preoperative metatarsophalangeal mean 37.7. Group 0, was created collecting all those isolated scarf surgeries carried out in the year 2022. Next we filter those that have a Meary Angle range equal to the group N 46. Meary mean -17.8, preoperative metatarsophalangeal angle mean 37.8. Preoperative weight-bearing radiographs and 6-month follow-up are evaluated. It is considered a recurrence a metatarsophalangeal angle above 20 from 6 months postoperatively. Results In the statistical study we observed that there were no differences between both groups neither in preoperative metatarsophalangeal angle nor in age (p>0.05). After medializing osteotomy there were a statistically significant change in the angles of Meary and Kite p<0.05. After surgery in group 1 the recurrence was 13.2% while in group 0 the recurrence rate was much higher (36.6%) (P<0.05). The odd ratio: flat feet with hallux valgus, only treated by scarf surgery, had a 3.8 times greater risk of recurrence than those treated with scarf and medializing osteotomy. Conclusion In our sample, flat feet was a risk factor for hallux recurrence, so it is recommended associate surgical gestures to correct flat feet.
Ana NÚÑEZ GARCÍA, Jaime A SÁNCHEZ LÁZARO (León, Spain), Javier SÚAREZ PÉREZ, Óscar FERNÁNDEZ HERNÁNDEZ, Ana R TRAPOTE CUBILLAS, Francisco J MADERA GONZÁLEZ
00:00 - 00:00 #42871 - PO83 Turf-toe injuries, a diagnostic and therapeutic challenge.
PO83 Turf-toe injuries, a diagnostic and therapeutic challenge.

Turf-Toe injuries encompass a wide spectrum of traumatic injuries of the first metatarsophalangeal (MTP) joint. They are produced by medial or lateral stress and forced hyperextension, which affects the plantar plate (PP). The patient will commonly complain of pain and swelling, limitation of mobility and instability. Grade III of Anderson classification requires surgical treatment. We report the case of a 38-year-old man who suffered trauma on his right great toe 3 months before. On examination, varus deformity, lateral sesamoid pain, and instability were notable. Weight-bearing radiographs revealed an avulsion-fracture of the PF, proximal displacement of the lateral sesamoid and hallux varus. MRI showed rupture of the lateral collateral ligament at the PF insertion, complete rupture of the PP with disinsertion at the level of PF and a mild joint effusion. The injury was classified as grade III, so surgical treatment was indicated. An L-shaped plantar approach was performed at the first interdigital space, finding rupture of the joint capsule, PP and lateral collateral ligament. They were reinserted into the PF with 2 JuggerKnot-1.45mm. After 10 days, the bandage was replaced by an orthosis and weight baring was allowed with rigid-soled orthopedic shoe for 6 weeks. The patient presented good functional outcomes with complete range of motion. Conclusions Turf-Toe injuries are uncommon, highly disabling, and require a high index of suspicion. Treatment is controversial, with surgery being indicated in grade III. In our experience, the reinsertion of the PP and the collateral complex in the PF presents satisfactory results.
Ana Rosa TRAPOTE CUBILLAS (León, Spain), Marcos GONZÁLEZ ALONSO, Francisco MADERA GONZALEZ, Oscar FERNÁNDEZ HERNÁNDEZ, Jaime Antonio SÁNCHEZ LÁZARO
00:00 - 00:00 #42879 - PO84 Our choice is Hofmann surgery for rheumatoid arthritis.
PO84 Our choice is Hofmann surgery for rheumatoid arthritis.

Introduction: Since Hoffman's original description in 1911, pan metatarsal head resection has proven to be an effective and versatile procedure in treating forefoot deformity. The Hoffman-Clayton procedure is a surgical procedure that is performed to treat deformities of the foot, commonly caused by rheumatoid arthritis. Current aim is to determine the results of the performed operations in patients with forefoot deformities in rheumatoid arthritis. Methods: In our study there were included 25 patients with forefoot deformities in rheumatoid arthritis (25 patients and 28 feet) who underwent metatarsal head resection from 2018 to 2023 years. All patients underwent resections of the metatarsal heads with Kirschner wires fixation. Analysis included clinical evaluation with the AOFAS Score and radiographic assessment. Results: The average preoperative AOFAS score was 33 (range, 30–41). The most recent AOFAS was 73 (range, 61–75). There were no wound healing problems. Every patient was satisfied with the surgical results. Conclusion: the Hpffman-Clayton arthroplasty may led to reliable pain relief and patient satisfaction. We consider this operation to be very good and it guarantees normal walking and the appearance of the foot.
Kirill MIKHAYLOV (Saint-Petersburg, Russia), Alexander BULATOV, Victor FOMICHEV, David PLIEV
00:00 - 00:00 #42890 - PO85 Return To Activity After Sesamoidectomy. Long Term Results.
PO85 Return To Activity After Sesamoidectomy. Long Term Results.

Background To review the return to work and sports activity of patients who have undergone open sesamoidectomy. Objectives The aim of this review was to follow the evolution after open sesamoidectomy, assessing the return to work and sports activity. We have conducted long-term follow-up for possible long-term complications. Study Design & Methods 20 sesamoidectomies have been performed in 18 patients from January 2012 to January 2020. All have a follow-up of more than 3 years with a mean of 74 months. 10 were women and 8 were men with an age range of 18 to 65 years and a mean age of 38 years. The return to work has been an average of 2 months and to sports activity of 3 months on average. Regarding the sesamoids, 14 were tibial and 6 fibular. The cause of sesamoid pain has been fractures that have not healed orthopedically, painful pseudoarthrosis of the sesamoid, and sesamoiditis with positive scintigraphy Results We have made the AOFAS scale going from 58 to 85 points. All 18 patients would undergo re-surgery. As complications we have had a section of the FHL, a hallux valgus and a hallux varus in the postoperative period without consequences. No patient has had to be reoperated for a complication. Conclusions After reviewing current bibliography and despite the black legend of this surgical technique, we believe that it is a good technique when it is well indicated. Our results are similar to those of other authors with recent publications.
Maria Cristina GARCIA-MARTINEZ (BARCELONA, Spain), Javier GONZALEZ-USTES, Sara CASTELLANOS-ALONSO, Cristina BALLESTERO-TELLEZ, Josep NOVELL-ALSINA
00:00 - 00:00 #42892 - PO86 Arthrodesis Of The Hallux As Salvage Surgery For Osteonecrosis Of The Proximal Phalanx After Percutaneous Surgery. A clinical case from our unit.
PO86 Arthrodesis Of The Hallux As Salvage Surgery For Osteonecrosis Of The Proximal Phalanx After Percutaneous Surgery. A clinical case from our unit.

Introduction and objectives Percutaneous surgery has revolutionized forefoot surgery in the last 20 years to establish itself as a comparable alternative to classic open surgery. However, it is not absent from complications. Our objective is to present a clinical case that after undergoing percutaneous hallux surgery valgus in 2006, consulted 16 years later for a painful rigid hallux claw. Material and methods This patient was first operated in 2006 by a surgeon from the F&A Unit of our hospital for hallux valgus and metatarsalgia percutaneously. In 2022, the patient is referred with painful hallux rigid claw deformity that interferes with footwear. X-ray shows partial necrosis of the base of the proximal phalanx together with a rigid dorsal metatarsophalangeal dislocation. The preoperative AOFAS test was 36 points. The patient was proposed a new rescue surgery: open metatarsophalangeal arthrodesis with the distal phalanx due to an important bone defect in the proximal phalanx. Results In March 2023, a metatarsophalangeal arthrodesis of the hallux was performed using an anatomical plate. The patient began inmediate weight bearing using a stiff sole shoe during the first month. 3 months after surgery, VAS 8 decreased to VAS 2, and the radiograph showed bone consolidation. At 12 months, the AOFAS test became 82 points. The patient was discharged with a satisfactory clinical and radiological result. Conclusion After percutaneous complication of hallux proximal phalange necrosis, open surgery of hallux arthrodesis with distal phalanx can be a good rescue option, offering a good clinical result in a medium term.
Maria Cristina GARCIA-MARTINEZ (BARCELONA, Spain), Javier GONZALEZ-USTES, Sara CASTELLANOS-ALONSO, Cristina BALLESTERO-TELLEZ, Josep NOVELL-ALSINA
00:00 - 00:00 #42899 - PO87 Method to perform the proximal and distal cuts of scarf osteotomy with the correct obliquity.
PO87 Method to perform the proximal and distal cuts of scarf osteotomy with the correct obliquity.

We present surgical guidelines to perform the proximal and distal scarf osteotomy cuts for hallux valgus deformity, with the correct obliquity calculated on loaded radiographs. Barouk describes the proximal and distal scarf osteotomy cuts considering exclusively the sagittal plane, choosing an obliquity of 60°. This results in a random horizontal plane cut, with the danger of obtaining an undesired effect. If we want to obtain a pure lateral transfer, without lengthening or shortening, the proximal and distal cuts in the transverse plane must be strictly perpendicular to the axis of the second metatarsal. The proposed method makes it possible to perform these cuts calculated in the surgical planning with the correct obliquity, avoiding undesired shortening or lengthening of the metatarsal. It consists of 6 guides with trapezium morphology, with a long side that should be flush with the medial diaphyseal cortex of the metatarsal and a short side. Between the long side and the two short sides, a different “K angle” is formed for each guide, between 70° and 80°. The angle K arises from the line perpendicular to the axis of the second metatarsal with the axis of the first metatarsal and can be calculated by subtracting the AIM from 90.
Fernández RAFAEL (Valencia (Spain)., Spain)
00:00 - 00:00 #42906 - PO88 Minimally invasive treatment of recurrent diabetic foot ulcers on the fifth metatarsal head.
PO88 Minimally invasive treatment of recurrent diabetic foot ulcers on the fifth metatarsal head.

Background Diabetic forefoot ulcers frequently result from elevated pressure on bony prominences, neuropathy, and poor limb circulation. Treating these ulcers, particularly when infected, is challenging and can often lead to toe or forefoot amputation. This study aims to assess the efficacy and safety of minimally invasive surgical offloading for recurrent diabetic ulcers of the fifth metatarsal through minimal invasive fifth metatarsal osteotomy and bunionettectomy. Methods A retrospective cohort study was conducted on patients surgically treated for diabetic foot ulcers on the lateral or plantar side of the fifth metatarsal head between January 2020 and May 2024. Outcomes included the time to healing of the primary ulcer and surgical wound, recurrence of ulcers, length of hospital stay, postoperative complications and reoperation rates. Clinical, and radiological parameters of the feet were evaluated, and patient-reported outcome measures were collected. Results Ten feet from nine patients were included who didn’t respond successfully to conservative offloading. The mean patient age was 70 years. Five feet were classified with Wagner grade 3 wounds, three feet with Wagner grade 2 wounds and one as grade 1. Ulcers completely healed in a mean period of nine weeks postoperatively. Two patients required 6 weeks of antibiotic treatment due to preexisting osteomyelitis. One postoperative infections occurred. There was no failure of correction, and all patients returned to wearing orthopedic shoes postoperatively. Conclusion Minimally invasive offloading of the fifth metatarsal is a safe and effective procedure for treating diabetic ulcers on the fifth metatarsal head that are refractory to conservative treatment.
Baïdir HALOUI (Aalst, Belgium), Wahid REZAIE, Frank NOBELS
00:00 - 00:00 #42911 - PO89 Union rate, metalwork removal and complications in Lapidus bunion correction using a plantar Lapidus plate, intercuneiform stabilisation and immediate weightbearing.
PO89 Union rate, metalwork removal and complications in Lapidus bunion correction using a plantar Lapidus plate, intercuneiform stabilisation and immediate weightbearing.

Background The Lapidus procedure is a corrective 1st tarsometatarsal joint (TMTJ) fusion, distal lateral soft tissue release, medial eminence resection +/- Akin osteotomy. Traditionally the fusion site is stabilised with screws and/or medial or dorsal plates and immobilised non-weightbearing in a plaster cast or orthotic boot with weightbearing commenced from six weeks. The procedure has been associated with non-union rates of 10% or higher. Recurrence of Hallux valgus has been observed with intercuneiform diastasis. Methods Between July 2021 and June 2023, 13 consecutive Lapidus procedures were performed utilising low-velocity, length retaining joint preparation, fixation with a plantar lapidus plate and a screw from the first metatarsal base to the middle cuneiform with immediate weightbearing allowed in a heel weightbearing shoe and/or short orthotic boot. Radiographic union, requirement for metalwork removal and complication data was recorded prospectively. Results All cases achieved radiographic union by 12 weeks. In all cases, patients returned to normal comfortable footwear by 12 weeks post-operatively. In one case, the plate/screw construct was exchanged for an intercuneiform screw due to irritation of the 2nd TMTJ by the 1st metatarsal base-middle cuneiform screw. In four cases, there were aseptic wound healing delays requiring dressing changes beyond two weeks. There were no cases of Tibialis Anterior or Peroneus longus tendon irritation or rupture. Conclusion/Findings We demonstrate that the Lapidus procedure can be performed safely using a plantar plate and immediate weight-bearing with no tendon irritation and low hardware removal rates.
Togay KOC, Hesham OSHBA (Crowthorne, United Kingdom)
00:00 - 00:00 #42912 - PO90 The learning curve of Minimally-invasive Extra-articular Transverse metatarsal and Akin osteotomy using an external jig for reduction, wire and screw placement.
PO90 The learning curve of Minimally-invasive Extra-articular Transverse metatarsal and Akin osteotomy using an external jig for reduction, wire and screw placement.

Background Minimally-invasive Extra-articular Transverse metatarsal and Akin (META) osteotomy is a fourth-generation percutaneous hallux valgus correction associated with a flat learning curve. Various commercially available jigs claim to accelerate the learning curve. The aim of this study is to analyze a single surgeon’s learning curve utilising such a jig. Methods Between June 2021 and March 2024, 14 consecutive META procedures were performed by the senior author using a jig for reduction, wire and screw placement and a standard-sized C-arm for image acquisition. Surgery duration, number of fluoroscopies, and surgery-associated complications were prospectively collected. Results The average surgery time was 50 min (SD 10.4, range 31-64 min). The median number of fluoroscopies required was 149 (IQR 49, range 64-215). Three cases required the jig to be abandoned. With these cases excluded, mean surgery time was 47.7 min (SD 10.2, range 31-63 min) and median number of fluoroscopies was 149 (IQR 73, range 64-194). Where the external jig was able to be utilised, after eight cases, surgery time dropped to below 45 minutes and fluoroscopic images under 100. No cases required conversion to open surgery. No cases require secondary screw removal. Conclusion/Findings Previous studies have consistently demonstrated initial operative times over 90 minutes and over 150 fluoroscopic images with 27 to 40 procedures being required to drop the operative time to under 45 min and require less than 100 fluoroscopic images. In our series, the use of an external jig accelerated the achievement of these proficiency measures.
Togay KOC, Hesham OSHBA (Crowthorne, United Kingdom)
00:00 - 00:00 #42916 - PO91 Hallux valgus complicated by gouty tophi treated with joint sparing corrective osteotomy.
PO91 Hallux valgus complicated by gouty tophi treated with joint sparing corrective osteotomy.

Hallux valgus (HV) and gout may present in a similar fashion, leading to pain and deformity of the first metatarsophalangeal joint (MTPJ). Studies have shown a high prevalence of HV in gouty patients and is associated with destructive joint arthritis. Most agree that surgical correction in the presence of joint arthropathy often excludes joint-sparing procedures. We present an uncommon case of hallux valgus presenting with a large tophaceous gout, being treated with excision and joint sparing corrective osteotomy. The patient is a 42-year-old male presenting with painful hallux valgus and concomitant gouty tophi of the 1st MTPJ. Plain radiographs showed adequate joint space without significant arthritis. Hallux Valgus Angle and Intermetatarsal Angle was 22 and 19.5 degrees respectively. A medial incision was made over the 1st MTPJ to excise the entire tophi followed by Chevron osteotomy of the 1st metatarsal. Using a small proximal incision, two beveled headless compression screws were used to secure the distal osteotomy. Akin procedure was then performed. Due to the chronic attenuation of the medial stabilizing structures, capsular plication was performed additionally. Post-operatively, the patient was allowed immediate full weight-bearing in Darco boots, which was weaned off after 2 weeks. At 4 months post-surgery, the patient recovered well with a painless joint and reported excellent range of motion. In conclusion, surgical management of a hallux valgus deformity with a concomitant gouty tophus should take into account the presence of MTPJ arthritis. Joint sparing corrective osteotomy should be considered in patients without significant joint destruction.
Keng Pui, Bryan HON (Singapore, Singapore), Wei Liang, Eric CHER
00:00 - 00:00 #42923 - PO92 Comparison of radiographic outcomes and 1st metatarsal shortening between minimally invasive chevron and akin, lapidus and scarf procedures in hallux valgus surgeries.
PO92 Comparison of radiographic outcomes and 1st metatarsal shortening between minimally invasive chevron and akin, lapidus and scarf procedures in hallux valgus surgeries.

Iatrogenic transfer metatarsalgia is a known complication of hallux valgus correction from excessive shortening of the 1st metatarsal. Most studies show that 1st metatarsal shortening should be less than 4.0mm to avoid such complications. This study aims to compare the extent of 1st metatarsal shortening and radiological outcomes across the different procedures. A retrospective study was conducted using data from a single tertiary hospital involving 92 feet who underwent Minimally Invasive Chevron and Akin (MICA) (n=32), Lapidus (n=34) and Scarf (n=26) procedures. Radiological outcomes collected include the Hallux Valgus Angle (HVA), Intermetatarsal Angle (IMA) and 1st metatarsal shortening measured via the Maestro’s method. All 3 techniques demonstrated significant improvements in HVA and IMA compared to preoperative measurements (p = <0.05). 1st metatarsal shortening was lower in MICA (0.06mm ± 1.55) compared to Scarf (0.44mm ± 4.14), however this was not statistically significant (p=0.608). Variance in 1st metatarsal shortening was smaller in MICA than Scarf. In our study Lapidus demonstrated the least MT shortening (-2.56mm ± 3.73) among the 3 procedures (p <0.05). Significant 1st Metatarsal shortening of more than 4mm was seen in 4 cases who underwent Scarf, while there were none in the MICA and Lapidus groups. All three techniques have been shown to provide adequate hallux valgus correction. Based on our study, Scarf has the highest risk of metatarsal shortening among the 3 procedures, potentially resulting in transfer metatarsalgia. As such, care should be taken while performing the osteotomy during Scarf procedure to minimize 1st metatarsal shortening.
Keng Pui, Bryan HON (Singapore, Singapore), Teddy CHEONG, Wenxian PNG, Inderjeet SINGH RIKHRAJ, Wei Liang, Eric CHER
00:00 - 00:00 #42938 - PO93 Cartiva interpositional arthroplasty versus arthrodesis in the treatment of hallux rigidus: A retrospective comparative study with mean 2 year follow up.
PO93 Cartiva interpositional arthroplasty versus arthrodesis in the treatment of hallux rigidus: A retrospective comparative study with mean 2 year follow up.

Background: The gold standard surgical treatment for hallux rigidus is arthrodesis, which sacrifices range of motion (ROM). The Cartiva synthetic cartilage implant (SCI) has been utilised as an interpositional arthroplasty, aiming to reduce pain whilst preserving ROM. We aimed to evaluate the clinical outcomes of Cartiva SCI compared to arthrodesis in our centre. Methods: A retrospective cohort study was conducted, enrolling all adult patients who underwent primary first MTPJ SCI arthroplasty or arthrodesis for the treatment of hallux rigidus. The primary outcome was a validated patient-reported outcome measure (PROM), the Manchester-Oxford Foot Questionnaire (MOXFQ). Secondary outcomes included EQ-5D, complication rates, VAS Pain and FAAM (ADL). Results: There were 33 cases divided into two groups (17 Cartiva SCI, 16 arthrodesis, mean age 59.0 ± 9.9 years) with a mean follow up of 2.3 years. There was no statistically significant difference in MOXFQ, EQ-5D, VAS Pain or FAAM (ADL) outcome scores between the Arthrodesis and SCI groups (p > 0.05). The mean MOXFQ Index score was 7.2 ± 6.4 for the SCI group and 3.9 ± 5.8 for the Arthrodesis group at final follow up (p = 0.15). Although complications were high in both groups, the overall hallux re-operation rate was 29.4 % in the SCI cohort and 0.0 % for arthrodesis. Conclusion: There was no significant superiority of Cartiva SCI over arthrodesis in terms of PROMs. Due to the higher rate of further surgical intervention in the SCI cohort, we recommend arthrodesis as the preferred surgical option for hallux rigidus.
Tom LEWIS, Sam TROWBRIDGE, Samuel FRANKLIN (London, United Kingdom), Benjamin LAU, Ramy SHEHATA, Shirley LYLE, Robbie RAY
00:00 - 00:00 #42940 - PO94 Lateral release in open hallux valgus correction surgery through a “trans-osteotomy” approach: a comparison cadaveric study with the trans articular approach.
PO94 Lateral release in open hallux valgus correction surgery through a “trans-osteotomy” approach: a comparison cadaveric study with the trans articular approach.

The main objective of lateral release is to release the lateral suspensory ligament and the lateral capsule while trying not to release the joint adductor tendon. A 'trans-osteotomy' approach has been described in the past but there are no studies demonstrating its effectiveness. The aim of the present study is to describe the technique and to compare it by means of a cadaveric study with a 'classic' approach, the 'trans-osteotomy' approach. 18 specimens divided into two groups. 6 anatomical structures identified as targets to assess the success of the release and possible damage to surrounding structures. The anatomical study showed that both techniques achieve the objective. With regard to the structures at risk, we saw that in the TA group there were 2/9 lesions (22.2%) of the LCL compared to 1/9 case (11.1%) in the TO group; we also saw that in the TA group there was a lesion of the CT in 6/9 cases compared to 8/9 in the TO group. All of these lesions appear linear and parallel to the tendon belly. The trans-osteotomy approach is an alternative that allows better visualisation of the lateral structures to be released and is less aggressive than other classical approaches. The data presented would seem to show that it is an approach that allows the purpose of release to be achieved effectively and safely. The data appear to be encouraging and open the way for further studies to confirm the validity of this promising variant.
Enrique Adrian TESTA (Bellinzona, Switzerland), Daniel POGGIO CANO, Markus KNUPP, Pablo RUIZ RIQUELME, Annamaria PORRECA, Albert BADUELL, Martin RIEGGER, Miki DALMAU PASTOR
00:00 - 00:00 #42950 - PO95 Fifteen years learning curve of scarf ostetomy for hallux valgus correction.
PO95 Fifteen years learning curve of scarf ostetomy for hallux valgus correction.

The study evaluates learning curve of scarf osteotomies in treatment of hallux valgus as a work of single surgeon. He performed 194 isolated scarfs of the first metatarsal (with/without Akin or lateral release) during 15 years. Radiological evaluation (by two non-operating surgeons) was done before surgery and at least one year after treatment. We measured intermetatarsal angle-IMA, hallux valgus angle-HVA, distal-metatarsal articular angle-DMAA, proximal-to-distal phalangeal-articular angle-PDPAA, translation of diaphysis and sesamoid position. Clinical evaluation was performed by Foot and Ankle Disability Index - FADI and the American Orthopedic Foot and Ankle Score – AOFAS. Descriptive statistics was done, and evaluation of paired samples was performed after testing the distribution of measured values. There were 182 women and 12 men. Bilateral surgery at once was done in 42 patients. There were HVA diminishes for 24°-from 32°(16°-60°) before to 8°(-27°-32°) after surgery, IMA for 10°-from 14°(6°-31°) to 4°(0°-13°), DMAA for 13°-from 18° to 5°, PDPAA for 8°-from 7° to -1° and sesamoid position from 5(2-7) to 2(1-7). First metatarsal translation was 59%(17%-94%). FADI enlarged from 65(26-99) to 95(45-100) and AOFAS from 76(47-98) to 96(72-100). All diferences were significant (p<0,05). Reccurence rate was 4,6%, iatrogenic hallux varus 6,3%, symptomatic screw in 9%, transfer metatarsalgia 2,3%, troughing 2,9% superfitial wound infecton 1,1% and postoperative hypesthesia 1,1%. Scarf osteotomy is reliable and safe procedure for correction of moderate to severe hallux valgus deformities. Relatively long learning curve is burden with solvable complications.
Hrvoje KLOBUČAR (Zagreb, Croatia), Borna STRAHONJA, Denis TRŠEK
00:00 - 00:00 #42951 - PO96 Popliteal nerve block anaesthesia versus combined spinal anaesthesia and local infiltration anaesthesia during hallux valgus surgery: a randomised clinical trial.
PO96 Popliteal nerve block anaesthesia versus combined spinal anaesthesia and local infiltration anaesthesia during hallux valgus surgery: a randomised clinical trial.

Background To determine the anaesthesia technique for hallux valgus surgery that allows early mobility, popliteal nerve block anaesthesia was compared with combined local infiltration anaesthesia (LIA) and spinal anaesthesia. Methods During this prospective, randomised, clinical trial, 31 patients eligible for hallux valgus surgery were randomised to receive either LIA/spinal anaesthesia or popliteal nerve block anaesthesia. Patients were mobilized during a short overnight stay. The primary outcome was early postoperative mobility. Intraoperative and postoperative pain relief and patient satisfaction were secondary outcomes. Results On the day of surgery, independent mobilization and weight-bearing ability of patients who received LIA/spinal anaesthesia were significantly better. No significant between-group differences were observed in postoperative pain. Good satisfaction with the anaesthetic technique was achieved in both groups. Conclusions Popliteal nerve block anaesthesia and LIA/spinal anaesthesia are suitable for hallux valgus surgery. Owing to its earlier independent mobility, we prefer LIA/spinal anaesthesia.
Leonieke PALMEN (Nijmegen, The Netherlands), Myrthe VAN DE VEN, Elcke KARTHAUS, Sander KOËTER, Justus JANSEN
00:00 - 00:00 #42960 - PO97 Five-year and extended postoperative outcomes of hallux valgus surgery: patient satisfaction and radiological results in a retrospective cohort study.
PO97 Five-year and extended postoperative outcomes of hallux valgus surgery: patient satisfaction and radiological results in a retrospective cohort study.

Abstract: Background: Hallux valgus surgery is a common procedure with varying long-term satisfaction and radiological outcomes. This study evaluates patient-reported outcomes and radiological results with a minimum follow-up of five years postoperatively. Methods: This retrospective cohort study included patients who underwent hallux valgus surgery between 2016 and 2018 at Østfold Hospital Trust. Patient satisfaction was assessed using the Manchester-Oxford Foot Questionnaire (MOxFQ), Likert scale, and Visual Analog Scale (VAS). Radiological outcomes were evaluated through imaging a minimum of five years postoperatively. Results: 98 patients (100 feet) underwent a Chevron osteotomy. A total of 77 feet had no deformity, 16 had mild deformity, and 7 had moderate hallux valgus deformity on the five-year postoperative x-ray. Mean MOxFQ index score was 15,2 (SD 17, 22). No statistically significant difference in mean MOxFQ index scores was found among the groups (p=0.61). On the Likert scale, 23% reported satisfaction and 58% high satisfaction at five years. Conclusion: Five years post-surgery, high patient satisfaction was observed regardless of residual deformity. Although some radiological recurrence was noted, it did not significantly impact patient-reported outcomes. These findings suggest satisfaction is influenced by factors beyond radiological appearance. We are currently conducting a prospective study to identify these factors, with the goal of optimizing surgical decision-making and techniques for better long-term outcomes.
Mikaela ENGARAS HAMRE (Grålum, Norway), Fredrik NILSEN, Marius MOLUND
00:00 - 00:00 #42963 - PO98 Checkrein deformity managed by midfoot Flexor Hallucis Longus Z-Plasty: A Case Report.
PO98 Checkrein deformity managed by midfoot Flexor Hallucis Longus Z-Plasty: A Case Report.

Checkrein deformities are rare and involve entrapment of the flexor hallucis longus (FHL) tendon in the posterior foot, just proximal to the flexor retinaculum of the ankle. In most cases, a checkrein deformity occurs secondary to trauma or following surgery. It has been suggested that the FHL tendon tethers or entraps scar tissue or fracture sites. This dynamic deformity caused the patient significant trouble walking and playing sports as in the stance phase of gait the toes were forced into maximum plantar flexion and ended up trapped under the foot. Surgical management is usually required in severe cases. Various surgical options are available for the correction of checkrein deformities. Case Report: We present the case of a 40-year-old male who attended with complaint of clawing of his great toe. A history of previous open reduction and internal fixation for ankle fracture was described 5 years back, implant removal 3 years ago and exploration of FHL 1 year ago, with release of the adhesions, but the deformity still occurs. The patient underwent successful surgical correction with exploration of FHL tendon with releasing adhesions of muscle belly and a z-plasty with a pulvertaft suture at the midfoot. Correction was achieved, with complete range of motion of the hallux and remission of the symptoms. Conclusion: Checkrein deformities are rare and involve entrapment of FHL tendon in the posterior foot. It is an important complication of tibial fracture, which can be managed by midfoot Z-plasty, as mentioned in our case, especially in recurrence cases.
Ana Rosa TRAPOTE CUBILLAS (León, Spain), Marcos GONZÁLEZ ALONSO, Francisco MADERA GONZALEZ, Oscar FERNÁNDEZ HERNÁNDEZ, Jaime Antonio SÁNCHEZ LÁZARO
00:00 - 00:00 #42972 - PO99 Proximal intermetatarsal angle behavior in percutaneous surgery: META vs MICA.
PO99 Proximal intermetatarsal angle behavior in percutaneous surgery: META vs MICA.

Introduction:Etiology of hallux valgus (HV) deformity remains controversial, with hypermobility of the first metatarsal-cuneiform (MTC) joint as a contributing factor. A greater intermetatarsal angle of the proximal fragment (IAPF) could enhance MTC joint stability. This study compares postoperative results and IAPF in MIS techniques: Metaphyseal Extra-Articular Transverse and Akin Osteotomy (META) and Chevron-Akin (MICA). It also analyzes the IAPF and the distance between the first and second metatarsals (Dist 1-2) and the association between the proportion of displacement of the first metatarsal head and IAPF. Methods:Patients with moderate to severe HV who underwent META or MICA between 2017 and 2022 were retrospectively reviewed. Full-weight bearing radiographs assessed hallux valgus angle (HVA), intermetatarsal angle (IMA), IAPF, Dist 1-2, and percentage of metatarsal head displacement pre- and postoperatively. Patients were grouped by displacement: over 75% and under 75%. Results:META group included 38 female patients (95%) with a median age of 55. MICA group included all female patients with a median age of 58. Both groups showed significant increases in IAPF and Dist 1-2 postoperatively. No significant differences were found between META and MICA groups, except for preoperative Dist 1-2 being higher in the META group. Higher IAPF was not associated with greater head displacement. Conclusion:META and MICA are effective for correcting moderate to severe HV, significantly increasing IAPF and Dist 1-2, contributing to MTC joint stability. Head displacement did not significantly impact IAPF. Future research should focus on long-term outcomes, particularly arthritis development and postoperative symptoms like recurrence or MTC joint pain.
Julieta BRUE (Buenos Aires, Argentina), Virginia CAFRUNI, Ana Cecilia PARISE, Julian PARMA, Pablo SOTELANO, Leonardo CONTI, Daniel VILLENA,