A CLINICAL AND ELECTRICAL STUDY OF ULNAR NERVE LESIONS IN THE HAND

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Abstract
An electrical study of motor and sensory nerve conduction in the hand was made on 9 patients with ulnar nerve lesions. Seven of the cases experienced weakness of hand muscles innervated by the ulnar nerve with the exception of the hypothenar group and no sensory loss. Five recovered without surgery and in 2 a local compression lesion was found at operation. The other 2 had mild involvement of the hypothenar muscles with severe weakness of the other hand muscles innervated by the ulnar nerve and some sensory loss. One recovered spontaneously while the removal of a "ganglion" relieved the other. Nerve conduction was slowed over the affected segment; most patients showed an abnormal muscle response to nerve stimulation indicated by low voltage, polyphasic action potentials of prolonged duration and it was observed that nerve conduction could be slowed proximal to the lesion. The rate of conduction over the motor nerve provided a basis for estimation of the degree of nerve damage.

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