Peroneus brevis is the primary lateral ankle stabiliser. Its tendon lies anterior to peroneus longus in the retromalleolar groove and inserts on the fifth metatarsal styloid — the avulsion site in inversion sprains.
| Origin | Lower two-thirds of lateral fibula and anterior intermuscular septum |
|---|---|
| Insertion | Styloid process of the fifth metatarsal |
| Nerve Supply | Superficial peroneal nerve (L4, L5, S1) |
| Blood Supply | Peroneal artery |
| Actions | Everts the foot — primary lateral ankle stabiliser; Assists ankle plantarflexion |
|---|
Peroneus brevis longitudinal split tears occur at the retromalleolar groove. The split is identifiable on axial MRI as a C-shape. Tubularisation repair and groove deepening address the split.
Palpated anterior to peroneus longus at the lateral malleolus during resisted eversion.
Retromalleolar groove compression producing a split tear, the most common peroneal tendon injury, repaired by tubularisation and groove deepening.
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