CHANGES IN NERVE CONDUCTION WITH ULNAR LESIONS AT THE ELBOW

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Abstract
Nerve conduction studies were made on 14 patients each having an ulnar nerve lesion at toe elbow and on 15 control subjects. Conduction was measured by recording the muscle response from the abductor digiti minimi or toe first dorsal interosseous muscle following stimulation of the ulnar nerve just above toe wrist and elbow and in the axilla. In toe control series toe conduction velocity was significantly greater in toe upper arm than in toe forearm and elbow segment. In the patients with ulnar lesions toe conduction velocity was greatly reduced in toe forearm and elbow region with a variable slowing of conduction distal to the wrist. In order to define toe upper level of a lesion in toe absence of a clear-cut abnormality of motor conduction, nerve potentials were recorded from the axilla with stimulation above the elbow. It is toe authors'' opinion that unless toe degree of nerve damage produces definite impairment of power or sensation in toe hand, conduction studies are not likely to be of aid in localizing the level of an ulnar nerve lesion.

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