A new approach to accurate measurement of uniaxial joint angles based on a combination of accelerometers and gyroscopes
A new approach to accurate measurement of uniaxial joint angles based on a combination of accelerometers and gyroscopes
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DOI：
10.1109/tbme.2005.851475
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发表时间：
2005-08-01
影响因子：
4.6
通讯作者：
Aminian, K
中科院分区：
文献类型：
--
作者：
Dejnabadi, H;Jolles, BM;Aminian, K
提出了一种结合加速度计和陀螺仪测量关节角度的新方法。该方法提出了一种最小的传感器配置，每个段上安装一个传感器模块。该模型基于通过在旋转中心的相邻节段上放置一对虚拟传感器来估计关节旋转中心的加速度。在所提出的技术中，无需积分即可找到关节角度，因此可以获得不受任何漂移源影响的绝对角度。该模型考虑了解剖学方面，并在每次测量之前针对每个受试者进行个性化。通过测量八名受试者以三种不同速度行走的膝关节屈伸角度，并将结果与参考运动测量系统进行比较，对该方法进行了验证。结果与参考系统的结果非常接近，误差非常小（rms = 1.3，平均值 = 0.2，SD = 1.1 deg），并且具有出色的相关系数 (0.997)。该算法能够实时提供关节角度，可用于步态分析。从技术上讲，该系统便携、易于安装，可用于长期监测而不妨碍自然活动。
A new method of measuring joint angle using a combination of accelerometers and gyroscopes is presented. The method proposes a minimal sensor configuration with one sensor module mounted on each segment. The model is based on estimating the acceleration of the joint center of rotation by placing a pair of virtual sensors on the adjacent segments at the center of rotation. In the proposed technique, joint angles are found without the need for integration, so absolute angles can be obtained which are free from any source of drift. The model considers anatomical aspects and is personalized for each subject prior to each measurement. The method was validated by measuring knee flexion-extension angles of eight subjects, walking at three different speeds, and comparing the results with a reference motion measurement system. The results are very close to those of the reference system presenting very small errors (rms = 1.3, mean = 0.2, SD = 1.1 deg) and excellent correlation coefficients (0.997). The algorithm is able to provide joint angles in real-time, and ready for use in gait analysis. Technically, the system is portable, easily mountable, and can be used for long term monitoring without hindrance to natural activities.