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J Korean Assoc EMG Electrodiagn Med 2008;10(1):46-50.
Published online June 1, 2008.
A Case of Proximal Martin-Gruber Anastomosis Confused with Complete Conduction Block at the Elbow of Ulnar Nerve in a Patient with Ulnar Neuropathy
Abstract
Martin-Gruber anastomosis (MGA) is median-to-ulnar nerve communication in the forearm and the mostcommon congenital anomalous anastomosis. There were few reports about concomitant ulnar neuropathyand MGA. We present a case of ulnar neuropathy combined with proximal MGA. The location of anastomosisfrom median-to-ulnar nerve was proximal to below-elbow stimulation point along the ulnar nerve,which made it difficult to differentiate MGA from simple conduction block state of ulnar nerve aroundthe elbow. To recognize proximal MGA during routine nerve conduction study in patient with ulnar neuropathy,meticulous physical examination is required and proximal nerve stimulation such as axillashould be added during nerve conduction study.
Key Words: Median-to-ulnar nerve anastomosis, Martin-Gruber anastomosis, Ulnar neuropathy, Nerve conduction study, Electromyography
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