Silva Miguel P T, Ambrósio Jorge A C
Institute of Mechanical Engineering, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal.
Gait Posture. 2004 Feb;19(1):35-49. doi: 10.1016/s0966-6362(03)00013-4.
The results of the inverse dynamic procedures used in gait analysis are known to be highly dependent on the quality of the kinematic and dynamic input data and on the biomechanical model anatomical data. In this paper the sensitivities of the system response to imprecision in the input data and biomechanical model were calculated. It was shown that the gait analysis results were very sensitive to the identification of the point of application of the external forces. The quality of the results was less sensitive to errors made during motion reconstruction and to uncertainties in the biomechanical anatomical data. In this study it is also shown that the adopted inverse dynamic analysis method, based on natural coordinates, effectively shielded any error made on a particular kinematic chain from propagation to other branches of the biomechanical model.
已知步态分析中使用的逆动力学程序的结果高度依赖于运动学和动力学输入数据的质量以及生物力学模型解剖数据的质量。本文计算了系统响应对于输入数据和生物力学模型中不精确性的敏感度。结果表明，步态分析结果对外力作用点的识别非常敏感。结果的质量对运动重建过程中产生的误差以及生物力学解剖数据中的不确定性不太敏感。在本研究中还表明，所采用的基于自然坐标的逆动力学分析方法有效地防止了特定运动链上产生的任何误差传播到生物力学模型的其他分支。
