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The nerve/tunnel index: a new diagnostic standard for carpal tunnel syndrome using sonography: a pilot study

Authors
 Hyoung Seop Kim  ;  Seung Ho Joo  ;  Zee-A Han  ;  Yong Wook Kim 
Citation
 JOURNAL OF ULTRASOUND IN MEDICINE, Vol.31(1) : 23-29, 2012 
Journal Title
JOURNAL OF ULTRASOUND IN MEDICINE
ISSN
 0278-4297 
Issue Date
2012
MeSH
Adult ; Body Height ; Body Mass Index ; Body Weight ; Carpal Bones/diagnostic imaging ; Carpal Tunnel Syndrome/diagnostic imaging* ; Electromyography ; Female ; Humans ; Male ; Median Nerve/diagnostic imaging* ; Observer Variation ; Pilot Projects ; Predictive Value of Tests ; Reference Values ; Sensitivity and Specificity ; Ultrasonography ; Wrist Joint/diagnostic imaging* ; Young Adult
Keywords
carpal tunnel syndrome ; median nerve ; nerve/tunnel index ; sonography
Abstract
OBJECTIVES: To define the relationship between body indices of healthy adults and cross-sectional areas of the carpal tunnel and median nerve and to obtain the nerve/tunnel index, which represents a new standard for diagnosing carpal tunnel syndrome using sonography.

METHODS: Body indices (height, weight, and body mass index) were analyzed in 60 healthy adults, and electromyography and sonography were also performed. The cross-sectional areas of the proximal and distal median nerve and carpal tunnel were obtained by sonography. The proximal and distal nerve/tunnel indices were obtained by calculating the ratio between the proximal and distal cross-sectional areas of the median nerve to those of the carpal tunnel and multiplying the value by 100.

RESULTS: Although the proximal cross-sectional areas of the median nerve and body indices showed statistically significant relationships with weak positive correlations, the proximal and distal areas of the carpal tunnel showed relatively stronger correlations with body indices. Between sexes, there were significant differences in the proximal median nerve cross-sectional area (mean ± SD: male, 10.48 ± 3.21 mm(2); female, 8.81 ± 3.21 mm(2); P < .05) and proximal carpal tunnel area (male, 182.50 ± 21.15 mm(2); female, 151.23 ± 21.14 mm(2); P < .05). There was no difference in the proximal nerve/tunnel index (male, 5.80% ± 1.72%; female, 5.91% ± 1.63%). There was a statistically significant difference in the distal carpal tunnel cross-sectional area (male, 138.90 ± 20.95 mm(2); female, 121.50 ± 18.99 mm(2); P < .05) between sexes, but the distal median area (male, 9.99 ± 3.42 mm(2); female, 8.46 ± 1.84 mm(2)) and distal nerve/tunnel index (male, 7.15% ± 2.00%; female, 7.01% ± 1.38%) showed no significant differences. The proximal index was significantly higher than the distal index (proximal, 5.85% ± 1.66%; distal, 7.08% ± 1.71%).

CONCLUSIONS: The nerve/tunnel index is unaffected by body indices or sex and thus may be a useful and objective standard for diagnosing carpal tunnel syndrome.
Full Text
http://www.jultrasoundmed.org/content/31/1/23.long
DOI
22215765
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Rehabilitation Medicine (재활의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Yong Wook(김용욱) ORCID logo https://orcid.org/0000-0002-5234-2454
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/91182
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