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Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve

OBJECTIVE: To assess the separate effects of thumb and finger extension/flexion on median nerve position and cross-sectional area. METHODS: Ultrasonography was used to assess median nerve transverse position and cross-sectional area within the carpal tunnel at rest and its movement during volitional...

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Autores principales: Toge, Yasushi, Nishimura, Yukihide, Basford, Jeffrey R., Nogawa, Takako, Yamanaka, Midori, Nakamura, Takeshi, Yoshida, Munehito, Nagano, Akira, Tajima, Fumihiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3867462/
https://www.ncbi.nlm.nih.gov/pubmed/24367601
http://dx.doi.org/10.1371/journal.pone.0083565
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author Toge, Yasushi
Nishimura, Yukihide
Basford, Jeffrey R.
Nogawa, Takako
Yamanaka, Midori
Nakamura, Takeshi
Yoshida, Munehito
Nagano, Akira
Tajima, Fumihiro
author_facet Toge, Yasushi
Nishimura, Yukihide
Basford, Jeffrey R.
Nogawa, Takako
Yamanaka, Midori
Nakamura, Takeshi
Yoshida, Munehito
Nagano, Akira
Tajima, Fumihiro
author_sort Toge, Yasushi
collection PubMed
description OBJECTIVE: To assess the separate effects of thumb and finger extension/flexion on median nerve position and cross-sectional area. METHODS: Ultrasonography was used to assess median nerve transverse position and cross-sectional area within the carpal tunnel at rest and its movement during volitional flexion of the individual digits of the hand. Both wrists of 165 normal subjects (11 men, 4 women, mean age, 28.6, range, 22 to 38) were studied. RESULTS: Thumb flexion resulted in transverse movement of the median nerve in radial direction (1.2±0.6 mm), whereas flexion of the fingers produced transverse movement in ulnar direction, which was most pronounced during flexion of the index and middle fingers (3.2±0.9 and 3.1±1.0 mm, respectively). Lesser but still statistically significant movements were noted with flexion of the ring finger (2.0±0.8 mm) and little finger (1.2±0.5 mm). Flexion of the thumb or individual fingers did not change median nerve cross-sectional area (8.5±1.1 mm(2)). CONCLUSIONS: Volitional flexion of the thumb and individual fingers, particularly the index and middle fingers, produced significant transverse movement of the median nerve within the carpal tunnel but did not alter the cross-sectional area of the nerve. The importance of these findings on the understanding of the pathogenesis of the carpal tunnel syndrome and its treatment remains to be investigated.
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spelling pubmed-38674622013-12-23 Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve Toge, Yasushi Nishimura, Yukihide Basford, Jeffrey R. Nogawa, Takako Yamanaka, Midori Nakamura, Takeshi Yoshida, Munehito Nagano, Akira Tajima, Fumihiro PLoS One Research Article OBJECTIVE: To assess the separate effects of thumb and finger extension/flexion on median nerve position and cross-sectional area. METHODS: Ultrasonography was used to assess median nerve transverse position and cross-sectional area within the carpal tunnel at rest and its movement during volitional flexion of the individual digits of the hand. Both wrists of 165 normal subjects (11 men, 4 women, mean age, 28.6, range, 22 to 38) were studied. RESULTS: Thumb flexion resulted in transverse movement of the median nerve in radial direction (1.2±0.6 mm), whereas flexion of the fingers produced transverse movement in ulnar direction, which was most pronounced during flexion of the index and middle fingers (3.2±0.9 and 3.1±1.0 mm, respectively). Lesser but still statistically significant movements were noted with flexion of the ring finger (2.0±0.8 mm) and little finger (1.2±0.5 mm). Flexion of the thumb or individual fingers did not change median nerve cross-sectional area (8.5±1.1 mm(2)). CONCLUSIONS: Volitional flexion of the thumb and individual fingers, particularly the index and middle fingers, produced significant transverse movement of the median nerve within the carpal tunnel but did not alter the cross-sectional area of the nerve. The importance of these findings on the understanding of the pathogenesis of the carpal tunnel syndrome and its treatment remains to be investigated. Public Library of Science 2013-12-18 /pmc/articles/PMC3867462/ /pubmed/24367601 http://dx.doi.org/10.1371/journal.pone.0083565 Text en © 2013 Toge et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Toge, Yasushi
Nishimura, Yukihide
Basford, Jeffrey R.
Nogawa, Takako
Yamanaka, Midori
Nakamura, Takeshi
Yoshida, Munehito
Nagano, Akira
Tajima, Fumihiro
Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title_full Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title_fullStr Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title_full_unstemmed Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title_short Comparison of the Effects of Flexion and Extension of the Thumb and Fingers on the Position and Cross-Sectional Area of the Median Nerve
title_sort comparison of the effects of flexion and extension of the thumb and fingers on the position and cross-sectional area of the median nerve
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3867462/
https://www.ncbi.nlm.nih.gov/pubmed/24367601
http://dx.doi.org/10.1371/journal.pone.0083565
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