Fibularis Brevis, Posterior View

Description

Running along the posterolateral distal leg, the fibularis (peroneus) brevis muscle belly tapers into a tendon that hugs the lateral surface of the fibula and descends posterior to the lateral malleolus. Fibularis longus sits more superficially and posteriorly at this level, its tendon crossing the same retromalleolar groove so the brevis tendon remains deep and closer to bone as both are restrained by the superior fibular (peroneal) retinaculum. Inferiorly, the talus and the distal tibia and fibula frame the ankle mortise, with articular cartilage indicated on the tibiotalar surfaces. A lateral ligament component of the ankle complex is also visualized adjacent to the malleolus. Posterior orientation is the one you want when teaching or planning around the retromalleolar course of the peroneal tendons, because tendon position and retinacular restraint explain a lot of lateral ankle pain. Fibularis brevis is the tendon most often involved in longitudinal split tears, classically associated with chronic lateral ankle instability and superior fibular retinaculum injury or subluxation of the peroneal tendons behind the fibula. Small space. High consequence. Use this plate in lower-limb anatomy labs, sports medicine modules on lateral ankle sprain sequelae, and orthopedic or podiatric publications that need an accurate posterior map of the peroneus brevis relationship to the lateral malleolus, talus, and ankle ligaments. Anatomical accuracy verified by SciePro's Medical Advisory Board.