Changes in the flexor digitorum profundus tendon geometry in the carpal tunnel due to force production and posture of metacarpophalangeal joint of the index finger: an MRI study.
Clinical Biomechanics. 2013-02-01; 28(2): 157-163
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1. Clin Biomech (Bristol, Avon). 2013 Feb;28(2):157-63. doi:
10.1016/j.clinbiomech.2012.11.004. Epub 2012 Dec 6.
Changes in the flexor digitorum profundus tendon geometry in the carpal tunnel
due to force production and posture of metacarpophalangeal joint of the index
finger: an MRI study.
Martin JR(1), Paclet F, Latash ML, Zatsiorsky VM.
(1)Department of Kinesiology, The Pennsylvania State University, University Park,
PA 16802, USA.
BACKGROUND: Carpal tunnel syndrome is a disorder caused by increased pressure in
the carpal tunnel associated with repetitive, stereotypical finger actions.
Little is known about in vivo geometrical changes in the carpal tunnel caused by
motion at the finger joints and exerting a fingertip force.
METHODS: The hands and forearms of five subjects were scanned using a 3.0 T
magnetic resonance imaging scanner. The metacarpophalangeal joint of the index
finger was placed in: flexion, neutral and extension. For each joint posture
subjects either produced no active force (passive condition) or exerted a flexion
force to resist a load (~4.0 N) at the fingertip (active condition). Changes in
the radii of curvature, position and transverse plane area of the flexor
digitorum profundus tendons at the carpal tunnel level were measured.
RESULTS: The radius of curvature of the flexor digitorum profundus tendons, at
the carpal tunnel level, was significantly affected by posture of the index
finger metacarpophalangeal joint (P