What is the role of sensory conduction studies in the evaluation of common peroneal nerve entrapment?

Updated: Oct 15, 2019
  • Author: Minoo Hadjari Hollis, MD; Chief Editor: Thomas M DeBerardino, MD  more...
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Answer

A superficial peroneal SNAP is important, and an abnormality of the sensory evoked response implies that the lesion is distal to the dorsal root ganglion, though it does not completely rule out an L5 radiculopathy. A loss in amplitude of this response implies some axonal loss affecting either the common peroneal nerve or its superficial branch.

The particular portion of the nerve that is injured cannot be determined if only a superficial peroneal nerve sensory study is performed. Comparison of the latency and amplitude of the superficial peroneal SNAP with the contralateral limb is required to define an approximate degree of axonal loss.


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