In Vivo Kinematics of the Thumb Carpometacarpal Joint During Three Isometric Functional Tasks

作者：Eni Halilaj, Michael J. Rainbow, Christopher Got, Joel Schwartz, Douglas C. Moore, Arnold‐Peter C. Weiss, Amy L. Ladd, Joseph J. Crisco · 发表于：Clinical Orthopaedics and Related Research · 年份：2013 · DOI：10.1007/s11999-013-3063-y · 被引用次数：81 · 研究领域：Orthopedic Surgery and Rehabilitation、Peripheral Nerve Disorders、Foot and Ankle Surgery

BACKGROUND: The thumb carpometacarpal (CMC) joint is often affected by osteoarthritis--a mechanically mediated disease. Pathomechanics of the CMC joint, however, are not thoroughly understood due to a paucity of in vivo data. QUESTIONS/PURPOSES: We documented normal, in vivo CMC joint kinematics during isometric functional tasks. We hypothesized there would be motion of the CMC joint during these tasks and that this motion would differ with sex and age group. We also sought to determine whether the rotations at the CMC joint were coupled and whether the trapezium moved with respect to the third metacarpal. METHODS: Forty-six asymptomatic subjects were CT-scanned in a neutral position and during three functional tasks (key pinch, jar grasp, jar twist), in an unloaded and a loaded position. Kinematics of the first metacarpal, third metacarpal, and the trapezium were then computed. RESULTS: Significant motion was identified in the CMC joint during all tasks. Sex did not have an effect on CMC joint kinematics. Motion patterns differed with age group, but these differences were not systematic across the tasks. Rotation at the CMC joint was generally coupled and posture of the trapezium relative to the third metacarpal changed significantly with thumb position. CONCLUSIONS: The healthy CMC joint is relatively stable during key pinch, jar grasp, and jar twist tasks, despite sex and age group. CLINICAL RELEVANCE: Our findings indicate that directionally coupled motion patterns in the...