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Effects of Elbow Position on Motor Conduction Velocity of the Ulnar Nerve

Mr. Nelson is currently assigned to the Bureau of Medical Services, US Public Health Service on Training, outside the service as a doctoral candidate, Physical Therapy Educational Programs, S114 Westlawn, University of Iowa, Iowa City, IA 52242.

The purpose of this study was to evaluate the ability of the ulnar nerve motor axons to conduct an evoked action potential at three elbow positions (0°, 90°, and 120°). The latency (from above and below elbow), negative-phase amplitude, and duration of the evoked action potential were used to evaluate the effect of elbow position on 50 normal men. The results indicate that latency of the response, negative-phase amplitude, and duration of the evoked action potential did not vary with the elbow position. Clinical implications for the performance of motor nerve conduction studies for the ulnar nerve are presented. Suggestions for arm position during the motor nerve conduction studies are included.

Key Words: Electromyography • Ulnar nerve

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Proper Elbow Position?

Camille Newlon, Russell V Hall, and Roger M Nelson
Physical Therapy 1981 61: 559. [Abstract] [PDF]

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