Modelling of knee joint muscles during the swing phase of gait -: a forward dynamics approach using MATLAB/Simulink
Modelling of knee joint muscles during the swing phase of gait -: a forward dynamics approach using MATLAB/Simulink
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DOI：
10.1016/s1569-190x(02)00133-8
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发表时间：
2003-04-15
影响因子：
4.2
通讯作者：
Scott, JJA
中科院分区：
文献类型：
--
作者：
Lim, CL;Jones, NB;Scott, JJA
本研究的主要目的是预测八个主要肌腱致动器在摆动周期中穿过膝关节的力(包括主动和被动)。膝关节模型被限制并简化为仅在矢状面内运动。它在很大程度上建立在数学符号中，并使用高性能计算和编程工具MatLab以及Simulink进行模拟。将股二头肌短头肌(BFSH)、VASTI三头肌(VL、Vm和VI)、股直肌(RF)和腿肌(BFLH、SemiM和SemiT)分别建模为与肌腱串联的二元集总参数实体，假设其为弹性的，具有已知的应力-应变关系。肌肉的力学行为由希尔型收缩单元和平行弹性单元描述，希尔型收缩单元模拟肌束的主动力-长度特性，平行弹性单元模拟肌肉的被动特性。膝关节模型的摆动周期为0.4S，膝关节最大屈曲约63度，提供安全的脚趾间隙，并最终伸展至约4度，为下一次脚跟撞击做准备。这项研究中的模拟结果与报道的数据的比较证明了对肌肉和肌腱力量的预测是可信的。基于对模拟结果的进一步分析和定量比较，最终将功能和解剖相似的肌肉近似为一个肌群，在肌肉-肌腱模型中，梭形肌纤维比羽状肌纤维更受欢迎。(C)2002 Elsevier Science B.V.保留所有权利。
The present study primarily aims to predict the force (both active and passive) of eight main muscle-tendon actuators crossing the knee joint during the swing cycle. The knee-joint model was restricted and simplified to motion in the sagittal plane only. It was largely built in mathematical notation and was simulated using a high-performance computing and programming tool, MATLAB, along with Simulink. The eight muscles-Biceps Femoris Short Head (BFSH), three heads of Vasti (VL, VM and VI), Rectus Femoris (RF) and the Hamstrings (BFLH, SemiM and SemiT) were each modelled as a two-element, lumped-parameter entity, in series with tendon, which was assumed to be elastic with a known stress-strain relationship. The mechanical behaviour of muscle was described by a Hill-type contractile element which models the active force-length characteristic of muscle fascicles, and a parallel-elastic element which models its passive properties.The knee joint model was simulated for a swing period of 0.4 s and the knee flexed to a maximum of approximately 63degrees, providing safe toe clearance, and eventually extended to about 4degrees to prepare for the next heel strike. A comparison of the simulation results in this study with reported data warrants confidence in the prediction of muscle and tendon force. Based on further analysis and quantitative comparison of simulation results, functionally and anatomically similar muscles were eventually approximated with a muscle group and fusiform muscle fibres were favoured over pennate fibres in the muscle-tendon model. (C) 2002 Elsevier Science B.V. All rights reserved.