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research-article

Does Wrist Laxity Influence 3D Carpal Bone Motion?

[+] Author and Article Information
Gordie Best

Queen's University, Department of Mechanical and Materials Engineering & Human Mobility Research Centre, Kingston, ON, 130 Stuart Street, Kingston, Ontario, Canada K7L 3N6
gordon.best@queensu.ca

Michelle Zec

Queen's University, Department of Surgery & Human Mobility Research Centre, Kingston, ON, 130 Stuart Street, Kingston, Ontario, Canada K7L 3N6
m.zec@queensu.ca

David Pichora

Queen's University, Department of Mechanical and Materials Engineering & Human Mobility Research Centre, Kingston, ON, 130 Stuart Street, Kingston, Ontario, Canada K7L 3N6
pichorad@hdh.kari.net

Robin Kamal

Stanford University, Stanford, 450 Broadway Street, Redwood City, CA 94063, USA
rnkamal@stanford.edu

Michael J Rainbow

Queen's University, Department of Mechanical and Materials Engineering & Human Mobility Research Centre, Kingston, ON, 130 Stuart Street, Kingston, Ontario, Canada K7L 3N6
michael.rainbow@queensu.ca

1Corresponding author.

ASME doi:10.1115/1.4038897 History: Received April 04, 2017; Revised December 17, 2017

Abstract

Previous 2D studies have shown that there is a spectrum of carpal mechanics that varies between row-type motion and column-type motion as a function of wrist laxity. More recent 3D studies have suggested instead that carpal bone motion is consistent across individuals. The purpose of this study was to use 3D methods to determine whether carpal kinematics differ between stiffer wrists and wrists with higher laxity. Wrist laxity was quantified using a goniometer in 10 subjects by measuring passive wrist flexion-extension range of motion. In vivo kinematics of subjects' scaphoid and lunate with respect to the radius were computed from CT volume images in wrist radial and ulnar deviation positions. Scaphoid and lunate motion was defined as 'column-type' if the bones flexed and extended as the wrist radial and ulnar deviated, and 'row-type' if the bones radial-ulnar deviated during wrist radial-ulnar deviation. We found that through wrist radial-ulnar deviation, the scaphoid primarily flexed and extended, but the scaphoids of subjects with decreased laxity had a larger component of radial-ulnar deviation (R2 = 0.48, P < 0.05). We also determined that the posture of the scaphoid in the neutral wrist position predicts wrist radial deviation range of motion (R2 = 0.46, P < 0.05). These results suggest that ligament laxity plays a role in affecting carpal bone motion of the proximal row throughout radial and ulnar deviation motions, however other factors such as bone position and impingements may also affect motion.

Copyright (c) 2017 by ASME
Topics: Bone , Kinematics
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