What is the role of electrodiagnostic studies in the evaluation of deep peroneal nerve entrapment?

Updated: Oct 15, 2019
  • Author: Minoo Hadjari Hollis, MD; Chief Editor: Thomas M DeBerardino, MD  more...
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Electrodiagnostic studies of the deep peroneal nerve are helpful in further defining the zone of compression and in evaluating for concomitant radiculopathy or peripheral neuropathy. In deep peroneal nerve injury or entrapment, the results may show a decrease in the amplitude of the response if axonal involvement is present or conduction block occurs from demyelination. The distal latency may be prolonged if entrapment is present in the anterior tarsal tunnel region, and the NCV is decreased across the leg region if the entrapment or injury is more proximal.

An accessory nerve may also be present. The accessory peroneal nerve originates from the superficial peroneal nerve and travels posterior to the lateral malleolus to provide variable innervation to the extensor digitorum brevis. This anomaly is identified when a response is recorded from the extensor digitorum brevis that is larger with proximal stimulation (at the fibular head) than with distal stimulation (at the ankle).

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