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FIG 1. Electrophysiologic and MR changes in common peroneal nerve palsy.
A, Axial T1-weighted image localizes affected muscles. TA indicates the anterior tibial muscles; ED, the extensor digitorum; and PL, the long peroneal muscle. No abnormalities are shown.
B, Axial TIRM image depicts increased signal intensity in the TA, ED, and PL muscles, a pattern compatible with a common peroneal nerve lesion.
C, EMG recording shows spontaneous activity in the TA and PL muscle; in the posterior tibial (TP), there is normal insertional activity.
D, On stimulation of the distal peroneal nerve, no compound muscle action potential (CMAP) can be recorded in the extensor digitorum brevis muscle of the foot.
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