The peroneus tertius (fibularis tertius) is an inconstant muscle (absent in about 8 to 10 percent of people) whose tendon, when present, runs with the EDL tendons beneath the extensor retinacula to the dorsal base of the fifth metatarsal. Its avulsion produces a small dorsal fifth metatarsal fracture distinct from the styloid avulsion of the peroneus brevis and from the Jones fracture. Its absence causes no functional deficit.
| Muscle | |
|---|---|
| Attachment | Dorsal base of the fifth metatarsal |
Ankle dorsiflexion and foot eversion in the anterior compartment
Peroneus tertius tendon avulsion produces dorsal fifth metatarsal base pain that must be distinguished from Jones fracture at the diaphyseal-metaphyseal junction and peroneus brevis styloid avulsion. CT confirms the fracture location and cortical integrity. Most peroneus tertius avulsions heal conservatively.
Dorsal fifth metatarsal avulsion from the peroneus tertius during inversion force producing dorsal foot pain managed conservatively.
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