A method for defining carpometacarpal joint kinematics from three-dimensional rotations of the metacarpal bones captured in vivo using computed tomography
A method for defining carpometacarpal joint kinematics from three-dimensional rotations of the metacarpal bones captured in vivo using computed tomography
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DOI：
10.1016/j.jbiomech.2013.05.019
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发表时间：
2013-08-01
影响因子：
2.4
通讯作者：
Murray, Wendy M.
中科院分区：
文献类型：
--
作者：
Buffi, James H.;Crisco, Joseph J.;Murray, Wendy M.
手掌骨（CMC）关节促进掌骨的运动，对功能性任务，特别是涉及精确抓取的任务至关重要。尽管它们很重要，但描述掌骨运动学的数据有限。在这篇简短的文章中，我们量化了单个受试者的体内掌骨运动学，并利用这些数据开发了必要的运动学函数，以便在手部的生物力学模型中增加CMC关节的旋转自由度。计算机断层扫描（CT）用于捕捉受试者无名指和小指掌骨在七种不同静态姿势下的三维旋转，选择在功能运动范围内定位第四和第五掌骨。CT图像被手工分割，产生掌骨在每个姿势的数字表面表示。从曲面出发，通过计算曲面顶点的正交基来定义旋转主轴。相对于指定的参考姿势，在每个姿势中，第四和第五掌骨的三维旋转都是围绕其主轴进行量化的。对于两个掌骨，围绕所有七种姿势的主轴旋转范围进行了计算。从处理后的数据中，计算出相当于三维运动范围的单轴和角度。最后，定义了运动学函数，使第四和第五CMC关节的运动作为一个自由度，耦合到单个广义坐标，从而能够对掌骨弓的形成进行建模。Elsevier Ltd.出版。
The carpometacarpal (CMC) joints of the hand facilitate motion of the metacarpals and are critical for functional tasks, especially tasks involving precision grasping. Despite their importance, only limited data describing metacarpal kinematics exist. In this short communication, we quantified in viva metacarpal kinematics from a single subject and used these data to develop the kinematic functions necessary to add rotational degrees of freedom at the CMC joints to a biomechanical model of the hand. Computed tomography (CT) was used to capture three-dimensional rotations of the metacarpal bones of the ring and little fingers of the subject in seven different static postures, chosen to position the fourth and fifth metacarpals throughout a functional range of motion. The CT images were manually segmented, yielding digital surface representations of the metacarpals in each posture. From the surfaces, principal axes of rotation were defined by calculating orthonormal bases of the surface vertices. The three-dimensional rotations of the fourth and fifth metacarpals were quantified in each posture about their principal axes, relative to a designated reference posture. For both metacarpals, ranges of rotations were computed about the principal axes across all seven postures. From the processed data, single axes and angles were calculated that were equivalent to the three dimensional ranges of motion. Finally, kinematic functions were defined that enabled modeling of the formation of a metacarpal arch by movement of the fourth and fifth CMC joints as one degree of freedom, coupled to a single generalized coordinate. Published by Elsevier Ltd.