In vivo triquetrum-hamate kinematics through a simulated hammering task wrist motion.
In vivo triquetrum-hamate kinematics through a simulated hammering task wrist motion.
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DOI：
10.2106/jbjs.j.01644
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发表时间：
2012-06-20
期刊：
影响因子：
--
通讯作者：
Crisco, Joseph J
中科院分区：
文献类型：
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作者：
Kamal, Robin N;Rainbow, Michael J;Crisco, Joseph J
背景：三角区-钩状关节的形态和运动学一直是持续研究的主题，因为它的关节提供了腕关节的稳定性和运动学。方法：对6名男性和6名女性志愿者(平均年龄[和标准差]，24.8±3.8岁)的右腕关节进行CT扫描。利用旋转轴和接触区域的路径，对第三掌骨、三角骨、钩骨和桡骨进行了三维运动学分析。结果：当腕关节尺骨相对于桡骨屈曲时，三角骨在钩骨上向远侧移动3.7±1.7 mm。大约在这个远端过程的中途，当三角肌似乎与钩骨的远端脊线接合时，三角肌开始左右移动。掌侧总移位2.6±1.1 mm。当腕尺屈时，三角肌-钩骨旋转轴的距离和变异性也减小：从11.7±4.1 mm减少到3.3±1.4 mm(p<；0.0001)。结论：我们的发现支持三角肌在钩骨的凸椭球面上旋转的概念，而对三角肌在钩骨上运动的螺旋面描述可能过于简单化。
BACKGROUND: The shape and kinematics of the triquetrum-hamate joint have been the subject of continued research, as its articulation provides wrist stability and motion. The purpose of this study was to measure the in vivo articulation of the triquetrum-hamate joint as the wrist moves along an important functional wrist motion, the dart thrower's path.METHODS: The right wrist of six male and six female volunteers (average age [and standard deviation], 24.8 ± 3.8 years) were imaged with computed tomography in five positions along a simulated hammering task. Three-dimensional kinematics of the third metacarpal, triquetrum, hamate, and radius were analyzed with use of the rotation axis and the path of contact areas.RESULTS: As the wrist ulnar-flexed with respect to the radius, the triquetrum translated 3.7 ± 1.7 mm distally on the hamate. Approximately midway through this distal course, when the triquetrum appeared to engage the distal ridge of the hamate, the triquetrum began translating volarly. Total volar translation was 2.6 ± 1.1 mm. As the wrist ulnar-flexed, there was also a decrease in the distance and variability in the location of the triquetrum-hamate rotation axis from the hamate centroid: it decreased from 11.7 ± 4.1 mm to 3.3 ± 1.4 mm (p < 0.0001).CONCLUSIONS: Our findings support the concept that the triquetrum rotates on the convex ellipsoid surface of the hamate and that the helicoidal description of the triquetrum's motion on the hamate may be an oversimplification.