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CPN vs L5 Radiculopathy — RACP Adult Medicine MCQ

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EasyNeurologyCPN vs L5 RadiculopathyRACP Adult Medicine

A 68-year-old man with common peroneal nerve palsy at fibular head has foot drop. Which examination finding distinguishes this from L5 radiculopathy?

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Correct answer: A — Preserved ankle inversion (tibialis posterior – L5 via tibial nerve, NOT peroneal)

CPN palsy: dorsiflexion and eversion weak but INVERSION preserved (tibialis posterior – L5 via tibial nerve). L5 radiculopathy: inversion ALSO weak.

Reference: eTG – 2025 – Neurology