Male Superior Fibular Retinaculum

Description

Running along the lateral aspect of the right ankle, the superior fibular (peroneal) retinaculum forms a thickened band of deep fascia spanning from the posterior margin of the lateral malleolus toward the calcaneus. Immediately deep to it, the fibularis longus and fibularis brevis tendons course posterior to the distal fibula within a shared synovial sheath, then turn anteriorly toward the lateral foot. The retinaculum lies distal to the distal tibiofibular syndesmosis and proximal to the inferior fibular retinaculum, framing the retromalleolar groove where these tendons are constrained. This is a small structure with outsized mechanical consequences. Lateral malleolar pain after an inversion injury often traces back to failure of this restraint, with fibular tendon subluxation or dislocation snapping over the malleolus when the superior fibular retinaculum is torn or avulsed. Side-on anatomy clarifies why: the tendons sit posterior to the fibula, and the retinaculum provides the roof of the fibro-osseous tunnel that keeps them reduced during dorsiflexion and eversion. For surgical repair, this view also helps orient the relationship to the sural nerve and small saphenous vein in the superficial lateral ankle, structures at risk during lateral incisions. Use this illustration for orthopaedic and sports medicine teaching on peroneal tendon instability, for operative atlases describing superior fibular retinaculum repair or groove-deepening procedures, and for radiology correlation when explaining MRI or ultrasound findings of retinacular disruption and tendon sheath effusion. It also fits cleanly into gross anatomy and lower-limb biomechanics modules focused on ankle stabilizers. Anatomical accuracy verified by SciePro's Medical Advisory Board.