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Radial Motor Nerve Conduction Studies in the Upper Arm.

INTRODUCTION
The main goal of this study is to determine the contribution of the anterior forearm muscles to the compound muscle action potential (CMAP) recorded from the extensor digitorum following proximal stimulation.


METHODS
Twenty-one healthy volunteers and 114 patients with compressive and traumatic radial neuropathies were examined. Stimulation was carried out at six different points: the distal third of the upper arm; Erb's point; axilla; medial upper arm; antecubital fossa; and ulnar groove.


RESULTS
In the control group, Erb's CMAP area was significantly greater than the distal CMAP area. In compressive neuropathy, there was conduction block, but no change in conduction velocity. There were no differences in Erb's CMAP latencies between the control group and patients with neuropathies.


DISCUSSION
CMAPs recorded over the extensor digitorum with stimulation at the brachial plexus represent the sum of the motor unit action potentials of the posterior and anterior forearm muscles.