Disease involving the common peroneal nerve or its branches, the deep and superficial peroneal nerves. Lesions of the deep peroneal nerve are associated with paralysis of dorsiflexion of the ankle and toes and loss of sensation from the web space between the first and second toe. Lesions of the superficial peroneal nerve result in weakness or paralysis of the peroneal muscles (which evert the foot) and loss of sensation over the dorsal and lateral surface of the leg. Traumatic injury to the common peroneal nerve near the head of the fibula is a relatively common cause of this condition. (From Joynt, Clinical Neurology, 1995, Ch51, p31)
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