Inferior Fibular Retinaculum of a Human Male as, Lateral View

Description

Running inferior to the lateral malleolus, the inferior fibular retinaculum forms a thickened band of deep fascia that bridges the posterolateral calcaneus to the lateral surface of the calcaneus and adjacent tarsal region, creating a fibrosseous tunnel for the fibularis (peroneus) longus and brevis tendons. The distal fibula and tibia define the ankle mortise superiorly, with the talus seated beneath them and the calcaneus positioned posterior and inferior. Lateral tarsal elements and the bases of the metatarsals extend anteriorly, while articular cartilage at the talocrural and subtalar joints is indicated at the joint margins. Clinically, this lateral perspective helps clarify why the fibularis tendons remain closely apposed to the lateral malleolus during gait, and how retinacular injury contributes to tendon instability. After inversion ankle sprains, the inferior fibular retinaculum can tear or attenuate, allowing fibularis brevis or longus subluxation, tenosynovitis, and chronic lateral ankle pain that is often reproduced with resisted eversion and dorsiflexion. It also frames the relationship between the retinaculum and the peroneal tubercle of the calcaneus, a common friction point and a key landmark when interpreting lateral ankle ultrasound or planning a retinacular repair. Orthopaedic and sports medicine teaching sessions often need a clean depiction of the lateral ankle fascia bands to explain peroneal tendon subluxation, retinacular reconstruction, and the difference between talocrural and subtalar contributions to hindfoot instability. Surgical atlases and rehab protocols for lateral ankle sprain can also pair this view with clinical tests and imaging annotations to make the anatomy operational rather than decorative. Anatomical accuracy verified by SciePro's Medical Advisory Board.