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首页> 外文期刊>Journal of Biomechanics >Assessment of screw displacement axis accuracy and repeatability for joint kinematic description using an electromagnetic tracking device
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Assessment of screw displacement axis accuracy and repeatability for joint kinematic description using an electromagnetic tracking device

机译：使用电磁跟踪装置评估螺杆位移轴的精度和可重复性，以进行关节运动学描述

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摘要

Screw displacement axes (SDAs) have been employed to describe joint kinematics in biomechanical studies. Previous reports have investigated the accuracy of SDAs combining various motion analysis techniques and smoothing procedures. To our knowledge, no study has assessed SDA accuracy describing the relative movement between adjacent bodies with an electromagnetic tracking system. This is important, since in relative motion, neither body is fixed and consequently sensitivity to potential measurement errors from both bodies may be significant. Therefore, this study assessed the accuracy of SDAs for describing relative motion between two moving bodies. We analyzed numerical simulated data, and physical experimental data recorded using a precision jig and electromagnetic tracking device. The numerical simulations demonstrated SDA position accuracy (p = 0.04) was superior for single compared to relative body motion, whereas orientation accuracy (p = 0.2) was similar. Experimental data showed data-filtering (Butterworth filter) improved SDA position and orientation accuracies for rotation magnitudes smaller or equal to 5.0degrees, with no effect at larger rotation magnitudes (p < 0.05). This suggests that in absence of a filter, SDAs should only be calculated at rotations of greater than 5.0degrees. For rotation magnitudes of 0.5degrees (5.0degrees) about the SDA, SDA position and orientation error measurements determined from filtered experimental data were 3.75 +/- 0.30 mm, (3.31 +/- 0.21 mm), and 1.10 +/- 0.04degrees (1.04 +/- 0.03degrees), respectively. Experimental accuracy values describing the translation along and rotation about the SDA, were 0.06 +/- 0.00 mm and 0.09 +/- 0.01degrees, respectively. These small errors establish the capability of SDAs to detect small translations, and rotations. In conclusion, application of SDAs should be a useful tool for describing relative motion in joint kinematic studies. (C) 2003 Published by Elsevier Science Ltd. [References: 12]
机译：螺杆位移轴（SDA）已用于描述生物力学研究中的关节运动学。先前的报告结合了各种运动分析技术和平滑程序来研究SDA的准确性。据我们所知，尚无研究评估SDA精度，即使用电磁跟踪系统描述相邻物体之间的相对运动。这很重要，因为在相对运动中，两个物体都没有固定，因此对来自两个物体的潜在测量误差的敏感性可能很高。因此，本研究评估了SDA描述两个运动物体之间相对运动的准确性。我们分析了数值模拟数据，以及使用精密夹具和电磁跟踪设备记录的物理实验数据。数值模拟表明，单人运动的SDA位置精度（p = 0.04）优于相对身体运动，而方向精度（p = 0.2）则相似。实验数据表明，对于小于或等于5.0度的旋转量，数据过滤（Butterworth滤波器）可改善SDA的位置和方向精度，而对于较大的旋转量则无影响（p <0.05）。这表明在没有过滤器的情况下，仅应在大于5.0度的旋转下计算SDA。对于围绕SDA的0.5度（5.0度）旋转量，根据过滤后的实验数据确定的SDA位置和方向误差测量值分别为3.75 +/- 0.30毫米，（3.31 +/- 0.21毫米）和1.10 +/- 0.04度（ 1.04 +/- 0.03度）。描述沿SDA的平移和绕其旋转的实验精度值分别为0.06 +/- 0.00毫米和0.09 +/- 0.01度。这些小的错误建立了SDA检测小的平移和旋转的能力。总之，在关节运动学研究中，SDA的应用应该是描述相对运动的有用工具。 （C）2003年由Elsevier Science Ltd.出版[参考文献：12]

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