Loading applied on prosthetic knee of transfemoral amputee: Comparison of inverse dynamics and direct measurements
Loading applied on prosthetic knee of transfemoral amputee: Comparison of inverse dynamics and direct measurements
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DOI：
10.1016/j.gaitpost.2009.07.126
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发表时间：
2009-11-01
期刊：
影响因子：
2.4
通讯作者：
Frossard, L.
中科院分区：
文献类型：
--
作者：
Dumas, R.;Cheze, L.;Frossard, L.
逆动力学是最全面的方法，可以获得步行过程中的净关节力和力矩。但是，它是基于假设（即，由理想关节连接的刚性段）并且已知其对输入数据敏感（例如，运动导数、关节中心和压力中心的位置、惯性参数）。或者，传感器可用于直接测量施加在经股截肢者残端上的载荷。因此，本研究的目的是比较直接测量的假肢膝关节上施加的力和力矩与通过三个逆动力学计算（对应于3段和2段）以及“地面反应向量技术”计算的力和力矩-在一名患者的步态过程中。估计的力和直接测量的力之间的最大RMSE（即，56 N）和力矩（即，5 Nm）的相对较小。然而，假体部件的动态结果（即，脚的吸收、膝盖的摩擦和限位器）仅部分地用逆动力学方法评估。(C)2009 Elsevier B. V.保留所有权利。
Inverse dynamics is the most comprehensive method that gives access to the net joint forces and moments during walking. However it is based on assumptions (i.e., rigid segments linked by ideal joints) and it is known to be sensitive to the input data (e.g., kinematic derivatives, positions of joint centres and centre of pressure, inertial parameters). Alternatively, transducers can be used to measure directly the load applied on the residuum of transfemoral amputees. So, the purpose of this study was to compare the forces and moments applied on a prosthetic knee measured directly with the ones calculated by three inverse dynamics computations - corresponding to 3 and 2 segments, and "ground reaction vector technique" - during the gait of one patient. The maximum RMSEs between the estimated and directly measured forces (i.e., 56 N) and moment (i.e., 5 N m) were relatively small. However the dynamic outcomes of the prosthetic components (i.e., absorption of the foot, friction and limit stop of the knee) were only partially assessed with inverse dynamic methods. (C) 2009 Elsevier B.V. All rights reserved.