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Journal of Hand Surgery (British and European Volume)
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Location of Impaired Sensory Conduction of the Median Nerve in Carpal Tunnel Syndrome

P. A. NATHAN, H. SRINIVASAN, LINDA S. DOYLE and K. D. MEADOWS

From the Portland Hand Surgery & Rehabilitation Center, Portland, Oregon, U.S.A

Correspondence: Peter A. Nathan, M.D., Portland Hand Surgery and Rehabilitation Center, 2455 N.W. Marshall, Suite 1, Portland, OR 97210 U.S.A.

Sensory conduction of the median nerve at the carpal tunnel for eight consecutive 1 cm segments of the nerve was evaluated in 217 hands of 153 of our patients with carpal tunnel syndrome. Impairment was found to be highly focal and often confined to a single 1 cm segment of the nerve. The section of the nerve at or just distal to the distal margin of the carpal tunnel was affected most frequently, the section within the tunnel was affected less often, and the section proximal to the tunnel at the level of the mid-carpal and radio-carpal joints was affected least. The greatest contrast between frequencies of slowing at adjacent segments occurred at the proximal and distal margins of the carpal tunnel. The distribution of the nerve impairment was similar between the sexes; however, among the men the segment affected most frequently was located 1 cm distal to the segment affected most frequently among the women. The general pattern of slowing which we found does not substantiate some commonly-held opinions about the aetiology of carpal tunnel syndrome.

Journal of Hand Surgery (British and European Volume), Vol. 15, No. 1, 89-92 (1990)
DOI: 10.1016/0266-7681(90)90056-A
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