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Purpose Methods Results Conclusion Level of Evidence Rotational ankle instability can be diagnosed in up to 18% of cases of chronic lateral ankle instability. It is characterised by an abnormal increase of talar rotation within the tibiofibular mortise, due to an injury in the most anterior component of the deltoid ligament secondary to a chronic deficiency of the lateral collateral ligament. The aim of this prospective observational study was to investigate the clinical outcomes following arthroscopic all‐inside medial and lateral ligament reconstruction for rotational ankle instability.A prospective observational study of consecutive patients undergoing arthroscopic all‐inside medial and lateral ligament reconstruction for rotational ankle instability 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 the EQ‐5D, European Foot and Ankle Society score and complications.Between 2020 and 2023, 12 patients underwent primary arthroscopic all‐inside medial and lateral ligament reconstruction for rotational ankle instability with pre‐ and post‐operative PROMs available for all 12 patients. The mean ± standard deviation age was 33.9 ± 7.2 years and the 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 domain 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; however, these were not statistically significant. There was one complication—a superficial peroneal nerve injury which resolved with a corticosteroid injection.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.Level IV. [ABSTRACT FROM AUTHOR]

Purpose: The purpose of this retrospective review was to determine the prevalence of osteochondral lesions (OCLs) of the lateral talar dome in patients with anterior ankle impingement with an associated hypertrophic distal fascicle of the anterior tibio-fibular ligament., Methods: Retrospective chart review identified 40 patients who underwent anterior ankle arthroscopy for the management of anterior ankle impingement. Clinical outcomes assessed included pre- and postoperative foot and ankle outcome score (FAOS), visual analogue scale (VAS), complications, failures, secondary surgical procedures, return-to-work data and return-to-sport data., Results: Thirty-two patients with a mean follow-up time of 29.3 ± 10.4 months were included. The hypertrophic distal fascicle of the anterior tibio-fibular ligament was hypertrophic in 29 patients (90.6%), with a mean thickness of 2.5 ± 0.4 mm on MRI. There were 22 OCLs of the lateral talar dome (75.9%) with an associated hypertrophic distal fascicle of the anterior tibio-fibular ligament visualized during arthroscopy. The international cartilage repair society gradings of the lesions included 3 (13.6%) grade I lesions, 15 (68.1%) grade II lesions, 3 (13.6%) grade III lesions, and 1 (4.6%) grade IV lesion. There was a statistically significant improvement in mean FAOS and VAS scores from preoperative to postoperative (p < 0.001). No cases of syndesmotic instability were observed following resection of hypertrophic distal fascicle of the anterior tibio-fibular ligament., Conclusion: This retrospective case series demonstrated that a hypertrophic distal fascicle of the anterior tibio-fibular ligament was associated with an OCL of the lateral talar dome identified during arthroscopic evaluation. In addition, preoperative MRI demonstrated poor sensitivity for the detection of these OCLs. Heightened awareness is warranted for potential lateral talar dome OCLs in patients presenting with anterolateral ankle impingement with a hypertrophic ATiFLdf identified on preoperative MRI in the absence of an associated OCLs., Level of Evidence: Level IV, Retrospective case series., (© 2024 European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: Residual symptoms can be observed after ankle lateral ligament repairs commonly due to hyperlaxity, severe ankle instability or a failed stabilization. In order to increase joint stability, ligament or capsular-ligament plication has been used in other joints. Given that the anterior portion of the deltoid is a stabilizer against anterior talar translation, it could be used as an augmentation to restrict anterior talar translation. The aim of this study was to describe an arthroscopic anterior deltoid plication with a bony anchor as an augmentation to the lateral stabilization. The results in a series of eight patients were presented., Methods: Eight patients (seven males, median age 31 [range, 22-43] years) presented residual instability after arthroscopic all inside lateral collateral ligament repair. Arthroscopic anterior deltoid ligament plication was performed in these patients. Median follow-up was 22 (range, 15-27) months. Using an automatic suture passer and a knotless anchor, the anterior deltoid was arthroscopically plicated to the anterior aspect of the medial malleolus., Results: During the arthroscopic procedure, only an isolated detachment of the anterior talofibular ligament was observed without any deltoid open-book injury in any case. All patients reported subjective improvement in their ankle instability after the arthroscopic all-inside ligament repair and the anterior deltoid plication with a bony anchor. On clinical examination, the anterior drawer test was negative in all patients. The median American Orthopedic Foot and Ankle Society score increased from 68 (range, 64-70) preoperatively to 100 (range, 90-100) at final follow-up., Conclusion: The arthroscopic anterior deltoid plication is a feasible procedure to augment stability and control anterior talar translation when treating chronic ankle instability in cases of residual excessive talar translation., Level of Evidence: Level IV., (© 2024 The Author(s). Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: The anatomy of the deltoid ligament is complex. There is agreement on the presence of superficial and deep layers but the number and frequency of fascicles remains controversial. Identifying injuries to specific components of the deltoid ligament may inform decision-making on their management. The anatomy was reviewed to establish the number and dimension of fascicles visible with three-dimensional (3D) volumetric magnetic resonance images (MRI)., Methods: Twenty ankles from asymptomatic healthy volunteers were imaged with 3D volumetric MRI. The presence of individual fascicles was recorded and measured in 3D., Results: The median age of participants was 26 years (range: 20-37) of which 13 (65%) were female. All 20 ankles had a deltoid ligament formed of four fascicles in two layers: three fascicles in the superficial layer; tibionavicular (mean dimensions 22.5 × 10.0 × 2.4 mm), tibiospring (16.6 × 6.7 × 1.9 mm) and tibiocalcaneal (23.8 × 4.6 × 1.8 mm) and a deep layer consisting of the tibiotalar fascicle, which could be divided into two parts: anterior tibiotalar (mean dimensions 10 × 5.6 × 4.1 mm) and the significantly larger posterior tibiotalar (14.2 × 13.8 × 17.5 mm, p < 0.01). There were no additional fascicles observed., Conclusions: The deltoid ligament complex was consistently visualised as four fascicles (tibionavicular, tibiospring, tibiocalcaneal, tibiotalar) in two layers (superficial and deep) in all 20 ankles. The posterior part of the tibiotalar fascicle was the thickest of all the fascicles in the deltoid ligament. It is, therefore, possible to accurately identify the components of the deltoid ligament, and 3T MRI can be used to assess fascicle-specific injury, which will guide treatment and rehabilitation., Level of Evidence: Level III., (© 2024 European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: The main purpose of our study was to evaluate satisfaction, recurrence, bone union and other complications after a minimum of two years follow-up in patients who had percutaneous claw and hammer (CHT) second toe correction utilizing a novel distal and bicortical proximal phalanx osteotomy (DBPPO)., Methods: A minimum two-year follow-up prospective cohort study was conducted on consecutive patients with symptomatic CHT deformities of the second toe corrected with percutaneous surgery. Primary outcomes included satisfaction, recurrence, bony union, and other complication rates specific to the second toe deformity correction. Secondary outcomes included Metatarsophalangeal-Interphalangeal AOFAS scale and Visual Analogue Scale (VAS)., Results: Between January and October 2020, 34 patients (43 feet) were clinically and radiologically evaluated pre and postoperatively at a mean of 26.6 months. Thirty-eight feet (88.4 %) were satisfied or very satisfied with their second toe deformity correction and 41 feet (95.3 %) would undergo surgery on this toe again. No deformity recurrence requiring revision was found. There were two complications (4.7 %): one toe (2.3 %) with persistent numbness and one (2.3 %) had a simple infection that resolved with oral antibiotics. All 43 s toe osteotomies demonstrated bony consolidation. Stiffness was reported in nine second toes (20.9 %), seven of them (77.8 %) having a rigid pre-operative deformity. Secondary outcomes demonstrated significant improvement in the mean ( ± standard deviation) AOFAS score which increased from 47.5 ± 17.9 preoperatively to 95.7 ± 7.7 postoperatively (p < .001). Mean VAS significantly improved from 4.9 ± 2.5 preoperatively to 0.3 ± 1.3 postoperatively (p < .001)., Conclusion: Percutaneous treatment of claw and hammer second toe deformities utilizing a DBPPO resulted in high levels of satisfaction with bony consolidation, no recurrence and low complication rates at two years follow-up., Level of Evidence: Level II - Prospective cohort study., Competing Interests: Competing interests The authors have no relevant financial or non-financial interests to disclose., (Copyright © 2024 European Foot and Ankle Society. Published by Elsevier Ltd. All rights reserved.)

Purpose: To provide return-to-performance outcomes after surgical treatment for medial malleolus stress fractures in the elite athlete. Additionally, to describe an individualised surgical approach in the management of medial malleolus stress fractures., Methods: Five athletes (six ankles) underwent surgical treatment for a medial malleolus stress fracture. The surgical technique was based on the extent of the fracture line in steps with first arthroscopic debridement of bony spurs, microfracturing of the fracture line and screw fixation. Return-to-performance data included time to return to sport-specific training, normal training, first competitive activity, performance and the return-to-performance rate., Results: Patients returned to sport-specific training at a median of 10 weeks. They started normal training at 16 weeks postoperatively and returned to their first competitive activity after 19 weeks. All patients had bony spurs on the distal tibia which were arthroscopically debrided. One patient received arthroscopic debridement of bony spurs alone. Four patients received additional microfracturing of the fracture line and three patients received screw fixation. All patients achieved clinical and radiographic union on follow-up computed tomography scan at 3 months postsurgery. At latest follow-up, no refractures nor hardware complications, nor any other complications were observed., Conclusion: Arthroscopic debridement of bony spurs, debridement and microfracturing of the fracture line and screw fixation are all viable surgical tools in the management of medial malleolus stress fractures in elite athletes. The surgical approach containing these options should be tailored to the individual athlete based on the fracture line in the sagittal plane. While most athletes return to full competitive activity in 3-4 months, time to self-reported return to full performance is often much longer., Level of Evidence: Level IV., (© 2024 The Author(s). Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: Ankle sprains remain the most common soft tissue injury presenting to Emergency Departments. Recently, there has been increased awareness and reporting of deltoid ligament injuries in association with injuries to the lateral ligament complex as well as with fibula fractures. This article reviews the currently available literature on the anatomy of the deltoid ligament, clinical and radiological diagnosis of injuries to the deltoid ligament and treatment recommendations., Methods: A literature review was conducted for keywords associated with deltoid ligament injuries. MEDLINE, PubMed and Embase databases were utilised for this search. Articles were included if involving an adult population, were English-language, were related to deltoid ligament injuries (with or without associated injuries) and reported on patho-anatomy, clinical or radiological diagnosis or treatment methods., Results: A total of 93 articles were assessed for relevance from the database search, and 47 were included after the removal of irrelevant articles and duplicates. Several studies reported on the clinical findings of deltoid ligament injury, as well as the radiographic analysis. Arthroscopy was considered the gold standard of diagnosis, with authors reporting on the potential benefit of performing arthroscopic repair or reconstruction at the same time. There were no studies that provided a system for the classification of deltoid ligament injury or larger studies of treatment pathways. Long-term studies of the incidence of instability in deltoid ligament injuries were not available., Conclusion: There is limited evidence available regarding deltoid ligament injuries, particularly in terms of treatment options, either in isolation or with concomitant injuries. Long-term follow-up studies are needed to obtain more accurate data on the number of complications., Level of Evidence: Level IV., (© 2024 The Author(s). Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: The medial collateral ligament of the ankle, or deltoid ligament, can be injured in up to 40% of patients who sustain an ankle inversion sprain. Reporting injuries of the deltoid ligament is not easy due to confusion in the current anatomical descriptions, with up to 16 fascicles described, with variable frequencies. The purpose of this study was to clarify the anatomy of the deltoid ligament., Methods: Thirty-two fresh-frozen ankle specimens were used for this study. Careful dissection was undergone until full visualization of the deltoid ligament was achieved and measurements taken., Results: The deltoid ligament was found to have four constant fascicles in two layers. The superficial layer consists of the tibionavicular, tibiospring and tibiocalcaneal fascicles, while the deep layer consists of the tibiotalar fascicle. Measurements of these fascicles are given in detail. The tibiotalar fascicle and the anterior part of the tibionavicular fascicle were found to be intra-articular structures., Conclusion: The deltoid ligament has a constant number of fascicles divided into a superficial and a deep layer. This clarification of the anatomy and terminology of the deltoid ligament and its fascicles will help clinical view, diagnosis and (interdoctor)communication and treatment. The ligamentous fibres of the deep layer, as well as the anterior fibres of the superficial layer (tibionavicular fascicle) are intra-articular, which could negatively impact its healing capacity, explaining chronicity of these types of injuries., Level of Evidence: Not applicable (cadaveric study)., (© 2024 The Authors. Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: When the intermediate or collicular fascicle of the medial collateral ligament (MCL) is injured, the diagnosis of posttraumatic medial ankle instability (MAI) is supported. The aim of this study was to describe an arthroscopic all-inside MCL repair after posttraumatic MAI secondary to an isolated injury of the MCL deep fascicle with a knotless suture anchor technique., Methods: Seven patients (seven men, median age: 23 [19-28] years) with posttraumatic MAI were treated by arthroscopic means after failing nonoperative management. The median follow-up was 34 (13-75) months. The MCL was repaired with an arthroscopic all-inside technique., Results: A tear affecting the deep and intermediate or collicular fascicle of the MCL was observed in all cases. In addition, five patients were diagnosed with an isolated fibular anterior talofibular ligament (ATFL) detachment, and in two patients, both the ATFL and calcaneofibular ligament were involved. All patients reported subjective improvement after the arthroscopic ligament repair. The median American Orthopedic Foot and Ankle Society score increased from 68 (range: 64-70) preoperatively to 100 (range: 90-100) at final follow-up., Conclusion: Posttraumatic MAI can be successfully treated by an arthroscopic all-inside repair of the MCL. The presence of an MCL tear affecting the tibiotalar ligament fibres attached to the area of the anterior colliculus should be considered a sign of posttraumatic MAI. This partial deltoid injury at the level of the intermediate or collicular fascicle will conduct to a dynamic MAI., Level of Evidence: Level IV., (© 2024 The Authors. Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: Although arthroscopic repair of the deltoid ligament is becoming a popular procedure, no studies have assessed which bundles of the deltoid ligament can be reached by anterior ankle arthroscopy. This study aimed to assess the feasibility of the arthroscopic repair of the deep layer of the deltoid ligament. In addition, it aimed to correlate which fascicle of the superficial layer of the deltoid ligament corresponds to the deep fascicle visualised by arthroscopy., Methods: Arthroscopy was performed in 12 fresh frozen ankles by two foot and ankle surgeons. With the arthroscope introduced through the anterolateral portal, the medial compartment and the deltoid ligament were explored in ankle dorsiflexion without distraction. Using a suture passer introduced percutaneously, the most posterior fibres of the deep deltoid ligament visualised by anterior arthroscopy were tagged. Then, the ankles were dissected to identify the deep and superficial bundles of the deltoid ligament tagged with a suture., Results: In all specimens (100%), the intermediate part of the tibiotalar fascicle, corresponding to the fibres originating from the anterior colliculus, was tagged with a suture. The posterior part of the tibiotalar fascicle was never tagged with a suture. In all specimens, the intermediate part of the tibiotalar fascicle grasped by the suture correlated with the tibiospring fascicle of the superficial layer., Conclusions: The current study demonstrates the feasibility of the arthroscopic repair of the deep fascicle of the deltoid ligament. By performing anterior arthroscopy, it is possible to visualise and repair the intermediate part of the tibiotalar fascicle (deep layer of the deltoid ligament). These fibres correspond to the tibiospring fascicle of the superficial layer. The clinical relevance of the current study is that the arthroscopic repair of the deep layer of the deltoid ligament is feasible through anterior ankle arthroscopy., Level of Evidence: Not applicable., (© 2024 European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: Rotational ankle instability is a multiligamentous injury defined as an overload injury of the deltoid ligament caused by a long-standing injury of the lateral collateral ligament in patients affected by chronic ankle instability. The purpose of the study was to compare the clinical outcomes of combined arthroscopic repair of lateral and medial ankle ligaments for rotational ankle instability versus isolated arthroscopic lateral ligament repair for lateral ankle instability at 2 years' follow-up., Methods: Between 2019 and 2021, 108 patients with chronic ankle instability were consecutively treated by arthroscopy. Of this group, 83 patients (77%) [median age: 26 (range, 14-77) years] underwent an isolated all-inside lateral ligament repair for lateral ankle instability (group A). In the remaining 25 patients (23%) [median age: 27 (range, 17-58) years], rotational ankle instability was clinically suspected and confirmed during arthroscopy; thus, a combined all-inside repair of lateral and medial ligaments was performed (group B). The same postoperative protocol was utilised for both groups. Patients were prospectively evaluated before surgery, at 3, 6, 12 and 24 months with Foot Functional Index (FFI) score, visual analogue scale (VAS) and Foot and Ankle Ability Measure-Sports subscale (FAAM-SS). At the latest follow-up, the satisfaction rate and complications were also recorded., Results: In both groups, FFI, VAS and FAAM-SS scores significantly improved compared to preoperative values (p < 0.001). In addition, according to all the scores evaluated, there was no significative difference (n.s) between groups at the final follow-up or at any of the intermediate follow-up. No major complications were observed in both groups., Conclusions: Arthroscopic ligament repair in case of ankle multiligamentous injuries, such as in rotational ankle instability, provides excellent clinical outcomes and is comparable to isolated lateral ligament repair at 2 years' follow-up. Therefore, when treating ankle instability, arthroscopic repair of each and every ligament that appears injured provides the best potential outcomes and is the recommended treatment., Level of Evidence: Level II, prospective comparative., (© 2024 European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Background: Combining osteotomies and soft tissue procedures is believed to reduce sesamoids in their anatomical position and maintain long-term correction when treating hallux valgus deformity. This study determines if a radiologic association exists between a radiolucent sign and a full percutaneous adductor tendon release (PATR), including a cadaveric study and a consecutive case series. Another aim was to determine the intra- and interobserver reliability of these observations., Methods: A prospective observational study was made between 2018 and 2019. First, a PATR was done on cadaveric specimens and, after the procedures, dissected to correlate what was seen fluoroscopically. The clinical group included 39 feet that presented mild-to-moderate HV deformity and were treated with percutaneous osteotomies associated with PATR., Results: Observers 1 and 2 saw a radioscopic radiolucent sign in 100% of cadavers and the patient population. They also observed a triangle-shaped image with an incidence of 75%, which we have named the "triangle sign.", Conclusion: The triangle sign may be helpful in the intraoperative confirmation of PATR and latero-plantar capsule release using this percutaneous technique., Level of Evidence: Level II, development of diagnostic criteria., Competing Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. Disclosure forms for all authors are available online., (© The Author(s) 2024.)

Purpose: Hamstring muscle strain injury is very common in sports involving high-speed running. Hamstring muscles originate from the ischial tuberosity and thus pelvic position may influence hamstring strain during different sports movements like sprinting, but this has only been evaluated by indirect methods. This study tested the hypothesis that a change in anterior pelvic tilt causes elongation of the overall hamstring complex and disproportionately elongates proximal relative to distal muscle regions., Methods: Seven fresh-frozen specimens (full lower limb with pelvis and lumbar spine) were used for this in vitro study. Specimens were dissected to enable visualization of the hamstring muscles and then fixed into a custom-made testing bench that allowed controlled movement of the pelvis over a fixed femur and tibia. Nine markers were inserted into the hamstring muscles to allow intra- and intermuscle difference measurements. Then, six different anterior pelvic angles were used to measure the difference in hamstring muscle lengthening through a three-dimensional reconstruction system based on stereoscopic machine vision technology., Results: An increase in anterior pelvic tilt produced a significant non-uniform increase in tissue elongation in all regions of the three hamstring muscles (semitendinosus, semimembranosus [SMB] and biceps femoris long head), which was greater in the proximal (>1 cm every 5°) compared to the distal region (≈0.4 cm every 5°). At the proximal hamstring region, SMB showed significantly greater length changes compared to conjoint tendons with nonstatistically significant elongation differences between muscles at the distal region., Conclusion: Considering the results of the study, the pelvis segment will likely play a fundamental role as a strain regulator of hamstring muscles. These results will have an impact on injury rehabilitation and prevention processes of hamstring injuries, as well as optimize future musculoskeletal models and avoid potential underestimation of the hamstring muscle-tendon complex lengthening during high-speed running., Level of Evidence: N/A., (© 2024 European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

Purpose: Chronic pain can affect up to 40% of patients after ankle inversion sprains. The current hypothesis to explain this high percentage of chronic pain is a partial/total rupture of anterior talofibular ligament (ATFL) superior fascicle, a structure that has recently been described as intra-articular and as having a different function than ATFL's inferior fascicle. This has created the need for diagnosing ATFL superior and inferior fascicles independently. Therefore, the objective of this study is to investigate if the ATFL's superior fascicle can be visualized on ultrasound, and to describe its ultrasonographic appearance., Methods: Twenty fresh-frozen ankle specimens were used in this 4-phases study. First, the specimens were scanned on US to identify what was believed to be ATFL's superior fascicle. Second, ATFL's superior fascicle was sutured under direct arthroscopic vision. Next, the specimens were scanned on US to obtain an image of the sutured structure. Finally, the specimens were dissected to confirm that the suture was indeed placed on ATFL's superior fascicle., Results: On the 20 specimens studied, full correlation was obtained between US, arthroscopic suture and specimen dissection. ATFL's superior fascicle US appearance is provided., Conclusion: ATFL's superior fascicle can be visualized on US, which will allow to undergo diagnosis of isolated injuries to that fascicle, a common finding in ankle microinstability. The results of this study will facilitate the diagnosis of partial or complete rupture of ATFL's superior fascicle, likely increasing the amount of ankle microinstability diagnosis, impacting clinical management of ankle sprain consequences., (© 2024 The Authors. Knee Surgery, Sports Traumatology, Arthroscopy published by John Wiley & Sons Ltd on behalf of European Society of Sports Traumatology, Knee Surgery and Arthroscopy.)

We describe an elite youth football player who developed lateral foot pain of previously unknown origin. A thorough patient history and physical examination as well as an in-depth presentation of radiographic findings on Computed tomography (CT) and Magnetic Resonance Imaging (MRI) scan were described. Through this combination, the puzzle was resolved and a rare peroneus longus tendinopathy due to bony spurs in the cuboid groove was diagnosed. A peroneus longus exploration, release and reduction of the cuboidal bone spurs was performed and intensive rehabilitation phase followed. The patient successfully returned to performance and set a career in professional football.

Purpose: Open ligament repair is widely considered the gold standard treatment for chronic ankle instability. Nevertheless, arthroscopic treatment of ankle instability has gained popularity becoming the preferred technique for many surgeons. This study aimed to compare the clinical outcomes of all-inside arthroscopic versus open lateral ligament repair for chronic ankle instability at 5 years follow-up., Methods: Ninety consecutive patients were surgically treated for chronic ankle instability without concomitant intra-articular pathology observed on MRI: 41 patients [median age 28 (range 15-54) years] underwent an open lateral ligament repair (OLR); 49 patients [median age 30 (range 19-47) years] underwent an all-inside arthroscopic ligament repair (ALR). Functional outcomes using the Foot Functional Index (FFI), the American Orthopaedic Foot and Ankle Society (AOFAS) Hindfoot Score, and the Foot and Ankle Ability Measure-Sports Subscale (FAAM-SS) were assessed preoperatively and at the latest follow-up. At the latest follow-up, the satisfaction rate and complications were also recorded., Results: The mean follow-up was 58 ± 17.6 (range 47-81) months. In both groups FFI, AOFAS and FAAM-SS score significantly improved compared to preoperative values (p < 0.001). There was no statistically significant difference in postoperative outcomes between groups in the AOFAS (n.s) and FAAM-SS (n.s), but the FFI results were significantly better in the ALR group (p < 0.05). No major complications were reported in either group., Conclusion: Open and arthroscopic ligament repair to treat chronic ankle instability without concomitant intra-articular pathology produced excellent comparable clinical outcomes at 5 years follow-up. The complications were minimal in both study groups with no significant differences in AOFAS and FAAM-SS scores. However, arthroscopic repair showed significantly better results on the FFI. Therefore, when treating chronic lateral ankle instability, surgeons should consider arthroscopic ligament repair., Level of Evidence: III., (© 2023. The Author(s) under exclusive licence to European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA).)

Injectable implants constitute a newly developed treatment class in the battle against osteoarthritis. They consist of water-formulated supramolecular polymer, coming from a new class of resorbable biomedical materials, and are implanted in encapsulated joints in a liquid form, where they solidify to form a tough, elastic, and cushioning layer between the joint surfaces. To resort any effect, intra-articular delivery should be guaranteed, and the implant should be distributed throughout the entire joint space. Traditional implantation techniques do not seem to suffice for this new implant class, being either imprecise (traditional injection) or overly invasive (open procedures and traditional arthroscopic surgery). We describe a needle arthroscopic implantation technique to reap the benefits of both worlds, ensuring precise implant delivery while avoiding unnecessarily invasive procedures. This study depicts our needle arthroscopic technique for implantation of injectable implants in the ankle, first metatarsophalangeal joint, and first carpometacarpal joint., (© 2023 The Authors.)

Purpose: Knowledge of the complex anatomy of the lateral ankle ligaments is essential to understand its function, pathophysiology and treatment options. This study aimed to assess the lateral ligaments and their relationships through a 3D view achieved by digitally marking their footprints., Methods: Eleven fresh-frozen ankle specimens were dissected. The calcaneus, talus and fibula were separated, maintaining the lateral ligament footprints. Subsequently, each bone was assessed by a light scanner machine. Finally, all the scans were converted to 3D polygonal models. The footprint areas of the talus, calcaneus and fibula were selected, analysed and the surface area was quantified in cm 2 ., Results: After scanning the bones, the anterior talofibular ligament inferior fascicle (ATFLif), calcaneofibular ligament (CFL) and posterior talofibular ligament (PTFL) footprints were continuous at the medial side of the fibula, corresponding to a continuous footprint with a mean area of 4.8 cm 2 (± 0.7). The anterior talofibular ligament (ATFL) footprint on the talus consisted of 2 parts in 9 of the 11 feet, whilst there was a continuous insertion in the other 2 feet. The CFL insertion on the calcaneus was one single footprint in all cases., Conclusion: The tridimensional analysis of the lateral ligaments of the ankle demonstrates that the ATFLif, CFL and PTFL have a continuous footprint at the medial side of the fibula in all analysed specimens. These data can assist the surgeon in interpreting the ligament injuries, improving the imaging assessment and guiding the surgeon to repair and reconstruct the ligaments in an anatomical position., (© 2023. The Author(s) under exclusive licence to European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA).)

Background: Ankle lateral ligament sprains are common injuries in sports, and some may result in persistent ankle pain and a feeling of instability without clinical evidence of instability. The anterior talofibular ligament (ATFL) has 2 distinct fascicles, and recent publications have suggested that injury isolated to the superior fascicle might be the cause of these chronic symptoms. This study aimed to identify the biomechanical properties conferred by the fascicles in stabilizing the ankle in order to understand potential clinical problems that may follow when the fascicles are injured., Purpose/hypothesis: The aim of this study was to determine the contribution of superior and inferior fascicles of the ATFL in restraining anteroposterior tibiotalar resistance, internal external tibial rotation resistance, and inversion eversion talar rotation resistance. It was hypothesized that an isolated injury of the ATFL superior fascicle would have a measurable effect on ankle stability and that the superior and inferior fascicles would restrain different motions of the ankle., Study Design: Descriptive laboratory study., Methods: A robotic system with 6 degrees of freedom was used to test ankle instability in 10 cadavers. Serial sectioning following the most common injury pattern (from superior to inferior fascicles) was performed on the ATFL while the robot ensured reproducible movement through a physiological range of dorsiflexion and plantarflexion., Results: Sectioning of only the ATFL superior fascicle had a significant and measurable effect on ankle stability, resulting in increased internal rotation and anterior translation of the talus, especially in plantarflexion. Sectioning of the entire ATFL resulted in significantly decreased resistance in anterior translation, internal rotation, and inversion of the talus., Conclusion: Rupture of only the superior fascicle of the ATFL may lead to minor instability or microinstability of the ankle joint, without objective clinical findings of gross clinical laxity., Clinical Relevance: Some patients develop chronic symptoms after an ankle sprain without overt signs of instability. This may be explained by an isolated injury to the ATFL superior fascicle, and diagnosis may require careful clinical evaluation and magnetic resonance imaging examination looking at the individual fascicles. It is possible that such patients may benefit from lateral ligament repair despite having no gross clinical instability.

Ankle microinstability results from the superior fascicle of anterior talofibular ligament (ATFL) injury and is a potential cause of chronic pain and disability after an ankle sprain. Ankle microinstability is usually asymptomatic. When symptoms appear, patients describe a subjective ankle instability feeling, recurrent symptomatic ankle sprains, anterolateral pain, or a combination of them. A subtle anterior drawer test can usually be observed, with no talar tilt. Ankle microinstability should be initially treated conservatively. If this fails, and because superior fascicle of ATFL is an intra-articular ligament, an arthroscopic procedure is recommended to address., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Purpose: Lateral ligament ankle sprains are common and the anatomy on imaging studies is vital for accurate diagnosis. The lateral fibulotalocalcaneal ligament (LFTCL) complex consists of the inferior fascicle of the anterior talofibular ligament (ATFL) which is connected by arciform fibres with the calcaneofibular ligament (CFL). The superior fascicle of ATFL is an independent structure that should be assessed individually. MRI evaluation of these distinct fascicles and the arciform fibres has not been described. The aim of this study is to identify the anatomical relationship of these components of the LFTCL complex in healthy individuals on MRI., Methods: Thirty ankles from healthy volunteers were imaged using 3D volumetric MRI. The ATFL fascicles and size were evaluated. Presence of arciform fibres connecting the inferior ATFL fascicle and CFL to form the LFTCL complex and anatomical relationship around the lateral ligament complex were assessed., Results: Both the superior and inferior ATFL fascicles were observed in 26 (86.7%) ankles. The superior ATFL fascicle was significantly larger in all specimens (39% longer and 80.7% wider). For the specimens with a single fascicle, this was similar in size to the superior fascicle observed in the other 26 specimens. These measurements were not affected by age or gender. Arciform fibres of the LFTCL complex were identified in 22 (84.6%) specimens with two ATFL fascicles and three (75%) ankles with a single ATFL fascicle. Connecting fibres from the ATFL to PTFL were observed in 19 (63.3%) ankles while connections between the CFL and PTFL were identified in 21 (70%) ankles. Five ankles had a perforating artery visualized in the intervening space between the superior and inferior ATFL fascicles (a branch of the lateral tarsal artery of the dorsalis pedis artery)., Conclusion: Two distinct ATFL fascicles may be identified in the majority of ankles on MRI. Isolated injury to the superior fascicle identified on MRI may be useful when diagnosing patients presenting with symptoms of subtle instability without overt ankle laxity on clinical examination. The current study is the first to identify the arciform fibres of the LFTCL complex supporting isolated ATFL repair in the presence of intact LFTCL complex., Level of Evidence: Level III., (© 2022. The Author(s) under exclusive licence to European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA).)

Background: The minimally invasive chevron-Akin (MICA) technique has already demonstrated efficacy compared with other known surgical treatments for mild to moderate hallux valgus (HV). MICA combines percutaneous osteotomies with the benefits of modern, rigid internal fixation. The aim of study was to evaluate the radiographic parameters, clinical improvement, and potential complications in moderate to severe HV cases, operated using the MICA technique., Methods: Retrospective study including 70 feet with HV operated using the MICA technique. The AOFAS hallux MTP-IP score and radiographics for HV evaluation were applied preoperatively, and after 6 months, 1 year, and 2 years of follow-up. The following radiographic parameters were measured: metatarsophalangeal hallux valgus angle (HVA), distal metatarsal articular angle (DMAA), interphalangeal angle (IPA), and intermetatarsal angle (IMA)., Results: The average preoperative VAS pain score was 8.2 ± 1.5, which improved to 1.2 ± 2.2 at 24 months. The mean preoperative IMA was 14.8 ± 3.6 degrees compared with a mean of 7.5 ± 2.1 degrees ( P < .01) at 24 months. The preoperative HVA value averaged 30.4 ± 9.8 degrees and at 6 months postoperatively 11.1 ± 6.8 degrees ( P < .01), which remained stable until measured at 24 months. The mean preoperative DMAA was 16.3 ± 8.6 degrees and at the 6-month follow-up was 7.8 ± 5.4 degrees ( P < .01). The mean preoperative IPA was 7.63 ± 4.4 degrees compared with a mean of 6.28 ± 3.5 degrees ( P > .05) at 24 months. Complications included painful hardware (14.28%), neuropathic pain (2.85%), and loss of correction (4.28%)., Conclusion: In this retrospective review from a single center, we found the MICA technique to be an effective procedure for correcting moderate to severe HV, with a low rate of recurrence and an acceptable rate of complications. Patients undergoing the surgical procedure in our series showed a significant reduction in radiographic parameters and a significant improvement in clinical scores, maintaining these results over time., Level of Evidence: Level IV, retrospective study.

Suspected bacterial arthritis of a native joint requires urgent management to control potential life-threatening sepsis and limit cartilage damage. Diagnosing bacterial arthritis is often challenging and relies on diagnostic tests with low accuracy. A high threshold for surgery poses a risk of undertreatment, whereas a low threshold for surgery could lead to overtreatment with unnecessary invasive and costly procedures. Surgical lavage through arthroscopy or arthrotomy is generally considered standard treatment. Nowadays, needle arthroscopy provides an alternative and potentially less-invasive approach that can safely lower the surgical threshold. Needle arthroscopy can be performed directly upon presentation at the patient's bedside, as it is well tolerated under local anesthesia. Therefore, this Technical Note presents a stepwise guideline for performing standardized needle arthroscopic lavage in patients with (suspected) bacterial arthritis of the shoulder, elbow, wrist, knee, and ankle., (© 2022 The Authors.)

Background: Bunionette deformity is described as a painful bony prominence on the lateral aspect of the fifth metatarsal head. The present study prospectively assessed the clinical, functional, and radiographic outcomes of sliding distal metatarsal minimally invasive osteotomy (S-DMMO) used in a large series of patients with a midterm follow-up period., Methods: From December 2015 to December 2018, we evaluated 74 feet (57 patients). Radiologic (4-to-5 intermetatarsal angle, fifth metatarsophalangeal angle, the fifth metatarsal head width, lateral deviation angle, fifth metatarsal length, medial displacement, and elevation), clinician-reported scores (AOFAS score, visual analog scale [VAS]) and patient-reported outcomes measure (Foot and Ankle Ability Measure [FAAM] activities of daily living [ADL], FAAM sports, Manchester-Oxford Foot Questionnaire [MOXFQ], and patient satisfaction survey) were included in the analysis. The time to bone union was also assessed., Results: The average 4-to-5 intermetatarsal angle improved from 11.1 degrees preoperatively to 4.5 degrees postoperatively ( P < .001), whereas the average fifth metatarsophalangeal angle improved from 15.7 degrees preoperatively to 4.8 degrees postoperatively ( P < .001). The lateral deviation angle was found to be 2.2 degrees. The fifth metatarsal length decreased from 66.6 to 64.3 mm postoperatively. The average initial medial displacement was 4.67 mm preoperatively and 4.54 mm at final follow-up. The elevation of the fifth metatarsal head was 1.08 mm. The American Orthopaedic Foot & Ankle Society score improved from 54.3 ± 20.86 points preoperatively to 93.4 ± 17.3 ( P < .001). VAS score decreased from 7.9 to 0.7 ( P < .001). Also, FAAM ALD, FAAM Sport, and MOXFQ showed statistically significant differences ( P < .001) between preoperative and postoperative periods. Patients found the procedure excellent in 89.1% of cases, very good in 5.4%, and good in 5.4%. Bone union was obtained at 8.1 weeks., Conclusion: The most important finding of the present study is that S-DMMO showed improvement in function and pain associated with a high satisfaction rate. Also, we found substantial capacity to correct deformities and a low incidence of complications., Level of Evidence: Level IV, case series.

The H19X-encoded miR-424(322)/503 cluster regulates multiple cellular functions. Here, it is reported for the first time that it is also a critical linchpin of fat mass expansion. Deletion of this miRNA cluster in mice results in obesity, while increasing the pool of early adipocyte progenitors and hypertrophied adipocytes. Complementary loss and gain of function experiments and RNA sequencing demonstrate that miR-424(322)/503 regulates a conserved genetic program involved in the differentiation and commitment of white adipocytes. Mechanistically, it is demonstrated that miR-424(322)/503 targets γ-Synuclein (SNCG), a factor that mediates this program rearrangement by controlling metabolic functions in fat cells, allowing adipocyte differentiation and adipose tissue enlargement. Accordingly, diminished miR-424(322) in mice and obese humans co-segregate with increased SNCG in fat and peripheral blood as mutually exclusive features of obesity, being normalized upon weight loss. The data unveil a previously unknown regulatory mechanism of fat mass expansion tightly controlled by the miR-424(322)/503 through SNCG., (© 2021 The Authors. Advanced Science published by Wiley-VCH GmbH.)

Introduction: A percutaneous selective flexor digitorum brevis (FDB) tenotomy and a proximal interphalangeal (PIP) joint arthrolysis may correct a lesser claw toe deformity keeping flexor digitorum longus (FDL) and active flexion. Our study aimed to verify if the procedure was effective and reliable and if it respects the surrounding soft tissues., Material and Method: Twelve cadaveric lateral toes were used. A dissection ensured the integrity of both digital nerves, FDL and flexor pulleys and assessed the section of both FDB slips and PIP arthrolysis., Results: A complete section of the two FDB slips was observed in 4 cases (33%). Arthrolysis was achieved in all cases. Surrounding soft tissues were found intact in all cases., Conclusion: This procedure is effective regarding PIP arthrolysis, but a technical improvement is required to achieve a reliable section of both FDB slips. In the hands of an experienced surgeon, it has proven to be safe., (Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Background: Percutaneous plantar fasciotomy is one of the available options for recalcitrant cases of plantar fasciopathy, but there is a mismatch in the clinical results between different author's experience, possibly due to variability when choosing the exact cutaneous entry point. The purpose of this study is to validate the plantar approach in the surgical treatment of plantar fasciopathy, describing a safe path and cutaneous entry point to perform a percutaneous plantar fasciotomy with a 2 mm incision testing the procedure on cadavers., Methods: a unicentric cross-sectional analytical study was conducted in 12 cadaveric feet to verify the accuracy of the percutaneous fasciotomy entry point. Independent variables analysed were: extent of fasciotomy, entry point location, spur resection, and soft tissues injuries. A double evaluation was performed: an indirect evaluation under fluoroscopic vision, and a direct evaluation after anatomical dissection., Results: No cases of plantar cortical lesion on the calcaneus was observed. Satisfactory fasciotomy was performed in 91.7% of the cases. An optimal entry point was noticed in all cases with a mean distance to the tip of tibial malleolus of 22.5 mm (±6.9; 35.1-12.1) and a mean distance to foot midline of 7.8 mm (±1.7; 11.8-5.1). No neurological nor vascular lesions were found. In all the feet, a laceration of the plantar part of flexor digitorum brevis muscle was noted., Conclusion: the plantar approach for percutaneous total plantar fasciotomy is a safe procedure. The current study provides an intraoperative guideline for minimising the possible risks., (Copyright © 2021 European Foot and Ankle Society. Published by Elsevier Ltd. All rights reserved.)