The relative contribution of selected carpal bones to global wrist motion during simulated planar and out-of-plane wrist motion.
The relative contribution of the scaphoid, lunate, triquetrum, and capitate to wrist motion was examined in 6 fresh cadaver forearms. A wrist-joint motion simulator was used to dynamically move each wrist through planar and nonplanar motions. During wrist flexion-extension, the motion of the capitate closely followed the motion of the third metacarpal, while the lunate motion was approximately 50% of the total motion; the triquetrum, 65%, and the scaphoid, 90%. Similar differences in motion for these carpal bones occurred during radioulnar deviation and circumduction and dart-throw motions. This suggests that the scaphoid, lunate, and triquetrum do not normally function as a single unit, but that each bone has an unique arc of motion during global wrist motion.
Werner
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FW
Department of Orthopedic Surgery, State University of New York Health Science Center, Syracuse 13210, USA.
Short
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WH
Fortino
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MD
Palmer
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AK
D001696:Biomechanical Phenomena; D002348:Carpal Bones / Q000502:physiology*; D006801:Humans; D066298:In Vitro Techniques; D009068:Movement; D016059:Range of Motion, Articular; D014955:Wrist Joint / Q000502:physiology*