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Journal of the Korean Academy of Rehabilitation Medicine 1997;21(1):200-204.
The Effect of Thumb Position on Median-Radial Latency Difference.
Kim, Hye Won , Cho, Eun Jin , Ko, Young Jin , Kang, Sae Yoon
Department of Rehabilitation Medicine, The Catholic University of Korea, Korea.
무지의 위치변화에 따른 정중신경과 표재성 요골신경 잠시의 차이
김혜원, 조은진, 고영진, 강세윤
가톨릭대학교 의과대학 재활의학교실
Abstract

In diagnosis of carpal tunnel syndrome, there are many techniques with high sensitivity. Among them, the median-radial latency difference(MRLD) is one of the most useful technique in screening mild carpal tunnel syndrome with high sensitivity, no painful discomfort to patients and no motor artifact.

In this study, we examined the effect of the thumb position(radial abduction and adduction) on the MRLD. Because the stimulation sites of the median sensory and superficial radial nerves are different from each other, the free movement of the thumb in this examination is not avoidable.

The results are 1) there is no significant effect of the thumb position on median sensory latency. 2) There is no significant effect of the thumb position on superficial radial latency. 3) There is significant effect of the thumb position on MRLD(P<0.01). Therefore, if we diagnose the mild carpal tunnel syndrome with MRLD, the thumb position must be maintained in neutral position through the examination.

Key Words: Carpal tunnel syndrome, Median-radial latency difference(MRLD), Thumb position


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