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中文摘要：
在对人体运动进行运动学或者动力学分析的时候，通常需要对各关节建立局部坐标系，而目前大部分人体关节坐标系定义方法都主要针对临床应用，需要具备专业的解剖学知识且可操作性差。本文首先描述了下肢的主要解剖学特征点，并通过这些特征点构建了髋关节、膝关节及踝关节坐标系，提出了定义人体关节坐标系的基本原则。通过利用运动捕捉系统对自愿者步态过程中的下肢运动轨迹进行采集，分析构建坐标系的特征点在运动过程中空间相对位置的不变性，说明了文章提出的下肢关节坐标系定义方法在一定范围内是合理的。
英文摘要：
Building a joint coordinate system （JCS） is very important in the kinematic and dynamic analysis of haman movement. At present, most of the methods on definiting human JCS are for the clinical application, so they require professional anatomical knowledge and have poor operability. First we introduced the major anatomical landmarks and JCS for hip, knee and ankle. During the discussion, we also found the principles on definitions of JCS for human. Then we obtained the data of the lower limb motion of the volunteer in gait by motion capture system. Analyzing the results, we found that the relative positions of the landmarks which were used to construct JCS did not change much during the movement. That means the method on definitions of JCS in this article was reasonable at a certain range.
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