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Introduction: Peroneal disorders are a common cause of ankle pain and lateral instability and have been described in as much as 77% of patients with lateral ankle instability. Clicking, swelling, pain, and tenderness in the peroneal tendons track are frequent symptoms, but they can be confused with other causes of lateral ankle pain. The management of peroneal disorders can be conservative or surgical. When the conservative treatment fails, surgery is indicated, and open or tendoscopic synovectomy, tubularization, tenodesis or tendon transfers can be performed. The authors present a surgical technique of tendoscopy associated to minimally invasive tenodesis for the treatment of peroneal tendon tears, as well as the preliminary results of patients submitted to this procedure. Methods: Four patients with chronic lateral ankle pain who were diagnosed with peroneal brevis pathology were treated between 2020 and 2022 with tendoscopic-assisted minimally invasive synovectomy and tenodesis. Using a 2.7 mm 30° arthroscope and a 3.0 mm shaver blade, the entire length of the peroneus brevis tendon and most parts of the peroneus longus tendon can be assessed within Sammarco's zones 1 and 2. After the inspection and synovectomy, a minimally invasive tenodesis is performed. Results: All patients were evaluated at least six months after surgery. All of them reported improvement in daily activities and in the Foot Function Index (FFI) questionnaire (pre-surgery mean FFI = 23.86%; post-surgery mean FFI = 6.15%), with no soft tissue complications or sural nerve complaints. Conclusion: The tendoscopy of the peroneal tendons allows the surgeon to assess their integrity, confirm the extent of the lesion, perform synovectomy, prepare the tendon for tenodesis, and perform it in a safe and minimally invasive way, reducing the risks inherent to the open procedure.

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INTRODUCTION: Since William Clancy (1979) and Richard Ferkel (1997) publications, the technique of peroneal groove deepening in patients with chronic dislocation, has been used with very satisfactory results and few complications. The aim of the present study is to describe a new minimally invasive technique of peroneal groove deepening with burs and specific percutaneous surgery instrumentation and without fibula osteotomy; and to evaluate the clinical and imaging results, in 5 patients operated with this technique. MATERIAL AND METHODS: A retrospective study of 5 patients with clinical and imaging diagnosis of chronic dislocation of peroneal tendons. They were treated with minimally invasive technique. This technique was described in this paper. Results were evaluated by preoperative and postoperative AOFAS score and by images (dynamic ultrasound, TAC and RMN). RESULTS: None of the treated patients presented dislocation recurrence or pain at the time of evaluation. The AOFAS score improved an average of 25.5 points and was statistically significant (p value 0.001). In the images we observed a concavity of the groove in all the evaluated cases. CONCLUSIONS: This minimally invasive technique of deepening the groove of the peroneal tendons is reproducible, has reduced operating times compared to open surgery and has excellent results. This is a noninvasive treatment alternative for dislocation of peroneal tendons.

INTRODUCCIÓN: Desde las publicaciones de William Clancy en 1979 y las de Richard Ferkel en 1997, la técnica de profundización del surco en pacientes con luxación crónica de los peroneos ha sido ampliamente utilizada, obteniendo resultados muy satisfactorios y escasas complicaciones. El objetivo del presente trabajo es describir una nueva técnica de profundización del surco mínimamente invasiva con fresas y un motor específico de cirugía percutánea, sin osteotomía y sin dejar lecho cruento del peroné, además de evaluar los resultados clínicos e imagenológicos en cinco pacientes operados con esta técnica. MATERIAL Y MÉTODOS: Se realizó un estudio retrospectivo de cinco pacientes con diagnóstico clínico y de imágenes de luxación crónica de tendones peroneos intervenidos con técnica mínimamente invasiva, la cual ya fue descrita. Los resultados fueron evaluados mediante el score AOFAS (por sus siglas en inglés American Orthopedic Foot and Ankle Score) de manera pre y postquirúrgica y a través de imágenes (ecografía dinámica, tomografía axial computada y resonancia magnética nuclear). RESULTADOS: Ninguno de los pacientes tratados presentó recidiva de luxación ni dolor al momento de la evaluación. El score AOFAS mejoró en promedio 25.5 puntos y fue estadísticamente significativo (p 0.001). En las imágenes observamos una concavidad del surco en todos los casos evaluados. CONCLUSIONES: Creemos que esta técnica mínimamente invasiva de profundización del surco de los peroneos es reproducible y presenta tiempos operatorios reducidos, comparada con la cirugía a cielo abierto; además tiene excelentes resultados. Por tales motivos, consideramos que se trata de una alternativa de tratamiento poco invasiva para la luxación de los tendones peroneos.

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Resumen: Introducción: Desde las publicaciones de William Clancy en 1979 y las de Richard Ferkel en 1997, la técnica de profundización del surco en pacientes con luxación crónica de los peroneos ha sido ampliamente utilizada, obteniendo resultados muy satisfactorios y escasas complicaciones. El objetivo del presente trabajo es describir una nueva técnica de profundización del surco mínimamente invasiva con fresas y un motor específico de cirugía percutánea, sin osteotomía y sin dejar lecho cruento del peroné, además de evaluar los resultados clínicos e imagenológicos en cinco pacientes operados con esta técnica. Material y métodos: Se realizó un estudio retrospectivo de cinco pacientes con diagnóstico clínico y de imágenes de luxación crónica de tendones peroneos intervenidos con técnica mínimamente invasiva, la cual ya fue descrita. Los resultados fueron evaluados mediante el score AOFAS (por sus siglas en inglés American Orthopedic Foot and Ankle Score) de manera pre y postquirúrgica y a través de imágenes (ecografía dinámica, tomografía axial computada y resonancia magnética nuclear). Resultados: Ninguno de los pacientes tratados presentó recidiva de luxación ni dolor al momento de la evaluación. El score AOFAS mejoró en promedio 25.5 puntos y fue estadísticamente significativo (p < 0.001). En las imágenes observamos una concavidad del surco en todos los casos evaluados. Conclusiones: Creemos que esta técnica mínimamente invasiva de profundización del surco de los peroneos es reproducible y presenta tiempos operatorios reducidos, comparada con la cirugía a cielo abierto; además tiene excelentes resultados. Por tales motivos, consideramos que se trata de una alternativa de tratamiento poco invasiva para la luxación de los tendones peroneos.

Abstract: Introduction: Since William Clancy (1979) and Richard Ferkel (1997) publications, the technique of peroneal groove deepening in patients with chronic dislocation, has been used with very satisfactory results and few complications. The aim of the present study is to describe a new minimally invasive technique of peroneal groove deepening with burs and specific percutaneous surgery instrumentation and without fibula osteotomy; and to evaluate the clinical and imaging results, in 5 patients operated with this technique. Material and methods: A retrospective study of 5 patients with clinical and imaging diagnosis of chronic dislocation of peroneal tendons. They were treated with minimally invasive technique. This technique was described in this paper. Results were evaluated by preoperative and postoperative AOFAS score and by images (dynamic ultrasound, TAC and RMN). Results: None of the treated patients presented dislocation recurrence or pain at the time of evaluation. The AOFAS score improved an average of 25.5 points and was statistically significant (p value< 0.001). In the images we observed a concavity of the groove in all the evaluated cases. Conclusions: This minimally invasive technique of deepening the groove of the peroneal tendons is reproducible, has reduced operating times compared to open surgery and has excellent results. This is a noninvasive treatment alternative for dislocation of peroneal tendons.

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BACKGROUND: No clear guideline or solid evidence exists for peroneal tendon tears to determine when to repair, resect, or perform a tenodesis on the damaged tendon. The objective of this study was to analyze the mechanical behavior of cadaveric peroneal tendons artificially damaged and tested in a cyclic and failure mode. The hypothesis was that no failure would be observed in the cyclic phase. METHODS: Eight cadaveric long leg specimens were tested on a specially designed frame. A longitudinal full thickness tendon defect was created, 3 cm in length, behind the tip of the fibula, compromising 66% of the visible width of the peroneal tendons. Cyclic testing was initially performed between 50 and 200 N, followed by a load-to-failure test. Tendon elongation and load to rupture were measured. RESULTS: No tendon failed or lengthened during cyclic testing. The mean load to failure for peroneus brevis was 416 N (95% confidence interval, 351-481 N) and for the peroneus longus was 723 N (95% confidence interval, 578-868 N). All failures were at the level of the defect created. CONCLUSION: In a cadaveric model of peroneal tendon tears, 33% of remaining peroneal tendon could resist high tensile forces, above the physiologic threshold. CLINICAL RELEVANCE: Some peroneal tendon tears can be treated conservatively without risking spontaneous ruptures. When surgically treating a symptomatic peroneal tendon tear, increased efforts may be undertaken to repair tears previously considered irreparable.

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We report a retrospective study of 171 consecutive patients with a lateral ankle sprain. All the patients with direct or blunt force trauma were excluded. Within 21 days of injury, 115 (67.25%) patients had undergone magnetic resonance imaging to evaluate for more serious or significant injuries. The average patient age was 44.09 years. Of the 115 patients, 75 (65.23%) had findings noted to be "significant." MRI can serve as a valuable and underused tool in the evaluation of acute lateral ankle injuries. The underuse of MRI might explain the high degree of variability in patients recovering from a lateral ankle sprain.

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