The superficial peroneal nerve supplies the peroneal evertors and provides dorsal foot sensation to most of the foot dorsum. Its piercing of the lateral leg fascia 10 to 12 cm above the lateral malleolus is clinically important because it is vulnerable to entrapment at this fascial exit point and can be injured during ankle surgery and fasciotomy at this location.
| Origin | Common peroneal nerve after division at the fibular head |
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Superficial peroneal nerve entrapment at the fascial exit point produces dorsal foot burning and numbness reproduced by direct pressure over the piercing site and by foot inversion (stretching the nerve). The nerve may be visible and palpable beneath the skin as a cord-like structure when the foot is inverted. Fascial release at the exit point resolves entrapment in most cases.
Nerve compression at the lateral fascial exit point producing dorsal foot numbness reproduced by foot inversion, managed with fascial release.
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