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KMID : 0361420120360010072
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Journal of Korean Academy of Rehabilitation Medicine
2012 Volume.36 No. 1 p.72 ~ p.79
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Ultrasonography of Median Nerve and Electrophysiologic Severity in Carpal Tunnel Syndrome
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Kang Seok
Kwon Hee-Kyu
Kim Ki-Hoon
Yun Hyung-Seok
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Abstract
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Objective: To investigate the correlation of the ultrasonographic wrist-to-forearm median nerve area ratio (WFR) and cross sectional area of median nerve at the wrist (CSA-W) to the electrophysiologic severity in patients with carpal tunnel syndrome (CTS).
Method: One hundred and ten wrists electrophysiologically graded as mild, moderate, and severe CTS and 38 healthy controls underwent ultrasonography of median nerve at the distal wrist crease and mid-forearm. WFR and CSA-W were analyzed according to the severity of CTS.
Results: WFR was 1.12±0.14, 1.91±0.33, 2.27±0.47 and 3.02±0.97 and the CSAs-W was 7.23±1.67 mm2, 13.51±3.72 mm2, 14.67±2.93 mm2, and 18.74±6.01 mm2 in controls, mild (n=28), moderate (n=46), and severe (n=36) CTS, respectively. CSA-W displayed signifi cant diff erences between the control and the mild CTS, moderate CTS and severe CTS groups. However, there was no significant difference between mild CTS and moderate CTS groups. WFR revealed signifi cant diff erence between all groups. Th e sensitivity and specifi city of the WFR in grading the severity of CTS were higher than those of the CSA-W.
Conclusion: Ultrasonography is a useful complementary tool for the evaluation of CTS. Both WFR and CSA-W are highly correlated with severity grade of CTS. However, WFR is superior to CSA-W for diagnosis and grading of the severity of CTS.
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KEYWORD
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Carpal tunnel syndrome, Ultrasonography, Electrophysiologic severity, Cross sectional area, Ratio
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