Peroneal tendon dislocations are most prevalent in the active and athletic population, so accurate diagnosis and management are essential for optimal return of function. Although many nonoperative and surgical management options have been described, the optimal treatment method continues to be debated. In this technique article, a modified retromalleolar groove-deepening technique is described for addressing all anatomic variations of the posterior distal fibula and retromalleolar groove without unduly disturbing the important anatomic facets meant for retention in this region. This technique is indicated for chronic dislocated peroneal tendons, recurrent dislocating peroneal tendons, and dislocation of the tendons after acute injury with a shallow fibular peroneal groove. Although it remains unclear what effect a cortically abraded fibular gliding surface or forceful cortical impaction on the fibrocartilage gliding surface might have on peroneal tendon integrity and function long term, it would seem preferable to avoid such techniques if reliable alternatives are available
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