NDLI: Median Nerve Deformation and Displacement in the Carpal Tunnel during Index Finger and Thumb Motion

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Median Nerve Deformation and Displacement in the Carpal Tunnel during Index Finger and Thumb Motion

Content Provider	PubMed Central
Author	Doesburg, Margriet H. M. Van Yoshii, Yuichi Villarraga, Hector R. Henderson, Jacqueline Cha, Stephen S. An, Kai-nan Amadio, Peter C.
Abstract	The purpose of this study was to investigate the deformation and displacement of the normal median nerve in the carpal tunnel during index finger and thumb motion, using ultrasound. Thirty wrists from 15 asymptomatic volunteers were evaluated. Cross-sectional images during motion from full extension to flexion of the index finger and thumb were recorded. On the initial and final frames, the median nerve, flexor pollicis longus (FPL), and index finger flexor digitorum superficialis (FDS) tendons were outlined. Coordinate data were recorded and median nerve cross-sectional area, perimeter, aspect ratio of the minimal enclosing rectangle, and circularity in extension and flexion positions were calculated. During index finger flexion, the tendon moves volarly while the nerve moves radially. With thumb flexion, the tendon moves volarly, but the median nerve moves towards the ulnar side. In both motions, the area and perimeter of the median nerve in flexion were smaller than in extension. Thus, during index finger or thumb flexion, the median nerve in a healthy human subject shifts away from the index finger FDS and FPL tendons while being compressed between the tendons and the flexor retinaculum in the carpal tunnel. We are planning to compare these data with measurements in patients with carpal tunnel syndrome and believe that these parameters may be useful tools for the assessment of CTS and carpal tunnel mechanics with ultrasound in the future.
Related Links	http://dx.doi.org/10.1002/jor.21131
Ending Page	1390
Page Count	4
Starting Page	1387
File Format	PDF
ISSN	07360266
e-ISSN	1554527X
Journal	Journal of orthopaedic research : official publication of the Orthopaedic Research Society
Issue Number	10
Volume Number	28
Language	English
Publisher Date	2010-03-01
Access Restriction	Open
Subject Keyword	Medicine(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine

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