Full body musculoskeletal model for simulations of gait in persons with transtibial amputation.
Full body musculoskeletal model for simulations of gait in persons with transtibial amputation.
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DOI：
10.1080/10255842.2022.2065630
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发表时间：
2023-03
影响因子：
1.6
通讯作者：
中科院分区：
文献类型：
--
作者：
本文介绍了一个肌肉骨骼模型，反映了使用OpenSim的经胫骨截肢者的解剖和假体特性的发展，属性和评价。平均被动假肢性能用于开发承窝，外架和足部的CAD模型，以取代小腿。额外的自由度（DOF）包括在每个关节的假体在一系列的研究领域，如插座扭矩和插座活塞的潜在用途。踝关节有三个自由度，以进一步提供模型的通用性。本研究招募了7名经胫骨截肢受试者。3D运动捕捉，地面反作用力和肌电图（EMG）数据收集，而参与者穿着他们规定的假肢，然后被动原型假肢仪器与6-DOF负荷传感器串联的挂架。该模型对踝关节、膝关节和髋关节运动学的估计与以前的研究相当。称重传感器提供了一个独立的实验测量踝关节扭矩，这是比较从模型的逆动力学结果，并显示了7.7%的平均绝对误差。EMG数据和肌肉输出从OpenSim的静态优化工具进行了定性比较，并显示出合理的协议。可能需要进一步改进肌肉特征或假肢特定的足部模型，以更好地表征个体截肢者的步态。该模型是开源的，可在（https：//simtk.org/projects/biartpseudosis）上获得，供其他研究人员使用，以促进我们对截肢者步态的理解，并协助开发新的下肢假肢。
This paper describes the development, properties, and evaluation of a musculoskeletal model that reflects the anatomical and prosthetic properties of a transtibial amputee using OpenSim. Average passive prosthesis properties were used to develop CAD models of a socket, pylon, and foot to replace the lower leg. Additional degrees of freedom (DOF) were included in each joint of the prosthesis for potential use in a range of research areas, such as socket torque and socket pistoning. The ankle has three DOFs to provide further generality to the model. Seven transtibial amputee subjects were recruited for this study. 3D motion capture, ground reaction force, and electromyographic (EMG) data were collected while participants wore their prescribed prosthesis, and then a passive prototype prosthesis instrumented with a 6-DOF load cell in series with the pylon. The model’s estimates of the ankle, knee, and hip kinematics comparable to previous studies. The load cell provided an independent experimental measure of ankle joint torque, which was compared to inverse dynamics results from the model and showed a 7.7% mean absolute error. EMG data and muscle outputs from OpenSim’s Static Optimization tool were qualitatively compared and showed reasonable agreement. Further improvements to the muscle characteristics or prosthesis-specific foot models may be necessary to better characterize individual amputee gait. The model is open-source and available at (https://simtk.org/projects/biartprosthesis) for other researchers to use to advance our understanding and amputee gait and assist with the development of new lower limb prostheses.
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