The superior peroneal retinaculum forms the fibrous roof of the retromalleolar groove, constraining the peroneus longus and brevis in their shared synovial sheath posterior to the lateral malleolus. Acute ankle inversion injuries can avulse the superior peroneal retinaculum from the fibula, allowing the peroneal tendons to sublux anteriorly over the lateral malleolus.
Maintains peroneal tendons in the fibular groove during ankle motion; prevents peroneal tendon subluxation
Peroneal tendon subluxation from SPR avulsion produces a painful snap over the lateral ankle with the tendon visibly jumping over the fibula during active dorsiflexion-eversion. Acute SPR repair provides the best results — chronic subluxation requires groove-deepening procedures and retinaculum reattachment.
SPR avulsion allowing peroneal tendon displacement over the lateral malleolus during ankle motion managed with acute retinaculum repair or chronic groove-deepening procedure.
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