基于电磁跟踪系统的人体上肢ROM测量新方法

New method to measure the ROM of human upper limb based on the electromagnetic tracking system

关节角度通常用欧拉角描述。欧拉角是坐标系从初始位置依次绕相互垂直的轴旋转至另一位置时绕各轴旋转的角度。但是在肘关节处,屈/伸轴与旋内/旋外轴明显不垂直,腕关节处也有此问题。提出利用电磁传感器测量肘、腕关节屈/伸轴实际方向的方法,给出环节依次绕两根不垂直的轴旋转的关节活动角度新算法,并测量4名成年人的肘、腕处的屈/伸轴,被测者肘关节屈/伸轴和旋内/旋外轴间的夹角分别为82.3°、77.8°、101°、80.1°;腕关节屈/伸轴和外展/内收轴间的夹角分别为62.6°、95.3°、76.6°、77.8°。

Three-dimensional joint rotations have been mainly described by Euler angles. The Euler angles are the angles that the coordinate system rotates about the perpendicular axis in turn between two attitudes. However, the elbow flexion - extension axis is not perpendicular to the elbow pronation-extension axis, also the wrist joint. Proposes a new method to measure the elbow and wrist flexion-extension axis＇s real orientations based on the electromagnetic sensors, presents a new way to calculate the ROM that the segments rotate about two axes which are not perpendicular, and measures four adults＇ elbow flexion-extension axis and wrist flexion-extension axis, the angles between the elbow flexion-extension axis and the elbow pronation-extension axis are 82. 3° ,77.8°、 301° ,80.1°, the angles between the wrist flexion-extension axis and the wrist abduetion-adduction axis are 62. 6°, 95. 3° ,76. 6° ,77.8°.