Peroneus longus crosses the plantar foot from the peroneal tubercle to the medial cuneiform, acting as a stirrup for the first ray and transverse arch.
| Origin | Upper two-thirds of lateral fibula and intermuscular septa |
|---|---|
| Insertion | Lateral medial cuneiform and base of first metatarsal — after crossing under the foot |
| Nerve Supply | Superficial peroneal nerve (L4, L5, S1) |
| Blood Supply | Peroneal artery |
| Actions | Everts the foot; Plantarflexes the first metatarsal — supports the transverse arch |
|---|
Peroneus longus rupture produces first ray instability. Os peroneum fractures indicate acute PL injury. Plantar PL tenosynovitis at the cuboid notch produces lateral plantar foot pain.
Palpated posterior to the lateral malleolus during resisted eversion — the larger peroneal tendon.
PL rupture producing first ray dorsal migration and lateral plantar pain, managed by surgical repair or tenodesis.
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