Determining finger segmental centers of rotation in flexion-extension based on surface marker measurement
Determining finger segmental centers of rotation in flexion-extension based on surface marker measurement
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DOI：
10.1016/s0021-9290(03)00112-x
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发表时间：
2003-08-01
影响因子：
2.4
通讯作者：
Braido, P
中科院分区：
文献类型：
--
作者：
Zhang, XD;Lee, SW;Braido, P
本文描述了一种新的算法的发展，该算法用于从体内测量的表面标记运动中提取屈伸过程中手指的旋转中心（COR）位置。该算法采用最小化内部连杆长度时间方差的优化程序，并结合了关节周围表面标记的局部运动（称为“表面标记偏移”）与关节屈伸之间的经验可量化关系。后一种关系约束和简化了优化程序，使其在计算上易于处理。为了实证研究这种关系并验证所提出的算法，我们进行了一项实验，在实验中，24名受试者（12名男性和12名女性）进行了手部抓筒运动。在每个受试者右手（抓握）背面的不同表面标记处放置球形反射标记，并在运动过程中通过光电系统进行测量。实验数据分析显示，“表面标记偏移”与标记定义的屈伸角之间存在高度线性关系：线性回归的平均R-2范围为0.89至0.97。该算法成功地确定了手指2-5的远端指间关节、近端指间关节和掌指关节在测量运动中的CORs。根据相对于表面标记轨迹的物理位置和不同关节和个体的一致性，推导出的CORs似乎是合理的。2003爱思唯尔科学有限公司版权所有。
This paper describes the development of a novel algorithm for deriving finger segmental center of rotation (COR) locations during flexion-extension from measured surface marker motions in vivo. The algorithm employs an optimization routine minimizing the time-variance of the internal link lengths, and incorporates an empirically quantifiable relationship between the local movement of a surface marker around a joint (termed "surface marker excursion") and the joint flexion-extension. The latter relationship constrains and simplifies the optimization routine to make it computationally tractable. To empirically investigate this relationship and test the proposed algorithm, an experiment was conducted, in which hand cylinder-grasping movements were performed by 24 subjects (12 mates and 12 females). Spherical retro-reflective markers were placed at various surface landmarks on the dorsal aspect of each subject's right (grasping) hand, and were measured during the movements by an opto-electronic system. Analysis of experimental data revealed a highly linear relationship between the "surface marker excursion" and the marker-defined flexion-extension angle: the average R-2 in linear regression ranged from 0.89 to 0.97. The algorithm successfully determined the CORs of the distal interphalangeal, proximal interphalangeal, and metacarpophalangeal joints of digits 2-5 during measured motions. The derived CORs appeared plausible as examined in terms of the physical locations relative to surface marker trajectories and the congruency across different joints and individuals. (C) 2003 Elsevier Science Ltd. All rights reserved.