Ambulatory measurement of 3D knee joint angle
Ambulatory measurement of 3D knee joint angle
复制标题
DOI：
10.1016/j.jbiomech.2007.12.003
复制
发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Aminian, K.
中科院分区：
文献类型：
--
作者：
Favre, J.;Jolles, B. M.;Aminian, K.
关节运动的三维测量是临床评估和治疗比较的一种很有前途的工具。尽管存在许多用于关节运动学评估的设备，但仍需要一种可用于常规实践的系统。这样的系统应该是准确的、可移动的和易于使用的。陀螺仪和加速度计(即惯性测量单元)的组合已被证明适合于在短时间(即几分钟)内进行无限制的方位测量。然而，由于它们无法检测水平参考，基于惯性的系统通常无法测量差异方向，这是计算内部生物力学学会(ISB)推荐的三维膝关节角度的先决条件。本文提出了一种基于腿部运动的简单方法来对准固定在大腿和小腿上的两个惯性测量单元。在此基础上结合融合算法，测量了行走过程中膝关节的三维角度，并与磁力运动捕捉系统进行了比较。该系统适用于膝关节绝对屈/伸角度和外展/内收角的测量，平均偏差(SD)为-1度(1度)和0度(0.6度)，均方根(RMS)误差为1.5度(0.4度)和1.7度(0.5度)。该系统还适用于膝关节内/外旋转的相对测量(平均(SD)偏移误差为3.4度(2.7度))，平均(SD)RMS误差为1.6度(0.5度)。本文介绍的方法可以很容易地用于测量其他关节的角位移，如肘关节或脚踝。(C)2007爱思唯尔有限公司。保留所有权利。
Three-dimensional measurement of joint motion is a promising tool for clinical evaluation and therapeutic treatment comparisons. Although many devices exist for joints kinematics assessment, there is a need for a system that could be used in routine practice. Such a system should be accurate, ambulatory, and easy to use. The combination of gyroscopes and accelerometers (i.e., inertial measurement unit) has proven to be suitable for unrestrained measurement of orientation during a short period of time (i.e., few minutes). However, due to their inability to detect horizontal reference, inertial-based systems generally fail to measure differential orientation, a prerequisite for computing the three-dimentional knee joint angle recommended by the Internal Society of Biomechanics (ISB). A simple method based on a leg movement is proposed here to align two inertial measurement units fixed on the thigh and shank segments. Based on the combination of the former alignment and a fusion algorithm, the three-dimensional knee joint angle is measured and compared with a magnetic motion capture system during walking. The proposed system is suitable to measure the absolute knee flexion/extension and abduction/adduction angles with mean (SD) offset errors of -1 degrees (1 degrees) and 0 degrees (0.6 degrees) and mean (SD) root mean square (RMS) errors of 1.5 degrees (0.4 degrees) and 1.7 degrees (0.5 degrees). The system is also suitable for the relative measurement of knee internal/external rotation (mean (SD) offset error of 3.4 degrees (2.7 degrees)) with a mean (SD) RMS error of 1.6 degrees (0.5 degrees). The method described in this paper can be easily adapted in order to measure other joint angular displacements such as elbow or ankle. (c) 2007 Elsevier Ltd. All rights reserved.