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首页> 外文期刊>Journal of Biomechanics >Knee medial and lateral contact forces in a musculoskeletal model with subject-specific contact point trajectories
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Knee medial and lateral contact forces in a musculoskeletal model with subject-specific contact point trajectories

机译：膝关节骨骼模型中的膝关节和侧向接触力，具有特定主题的接触点轨迹

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Contact point (CP) trajectory is a crucial parameter in estimating medial/lateral tibio-femoral contact forces from the musculoskeletal (MSK) models. The objective of the present study was to develop a method to incorporate the subject-specific CP trajectories into the MSK model. Ten healthy subjects performed 45 s treadmill gait trials. The subject-specific CP trajectories were constructed on the tibia and femur as a function of extension-flexion using low-dose bi-plane X-ray images during a quasi-static squat. At each extension-flexion position, the tibia and femur CPs were superimposed in the three directions on the medial side, and in the anterior-posterior and proximal-distal directions on the lateral side to form the five kinematic constraints of the knee joint. The Lagrange multipliers associated to these constraints directly yielded the medial/lateral contact forces. The results from the personalized CP trajectory model were compared against the linear CP trajectory and sphere-on-plane CP trajectory models which were adapted from the commonly used MSK models. Changing the CP trajectory had a remarkable impact on the knee kinematics and changed the medial and lateral contact forces by 1.03 BW and 0.65 BW respectively, in certain subjects. The direction and magnitude of the medial/lateral contact force were highly variable among the subjects and the medial-lateral shift of the CPs alone could not determine the increase/decrease pattern of the contact forces. The suggested kinematic constraints are adaptable to the CP trajectories derived from a variety of joint models and those experimentally measured from the 3D imaging techniques. (C) 2018 Elsevier Ltd. All rights reserved.
机译：接触点（CP）轨迹是估计来自肌肉骨骼（MSK）模型的内侧/横向胫骨接触力的关键参数。本研究的目的是开发一种方法将特定于对象特异性CP轨迹纳入MSK模型。十个健康的科目进行了45级跑步机步态试验。在胫骨和股骨上构建了特定于委托的CP轨迹，作为在准静态蹲下期间使用低剂量双平面X射线图像的延伸屈曲的函数。在每个延伸部屈曲位置，胫骨和股骨CP在内侧侧的三个方向上叠加，并在侧面上的前后和近端 - 远侧方向上叠加，以形成膝关节的五个运动约束。与这些约束相关联的拉格朗日乘法器直接产生内侧/横向接触力。将个性化CP轨迹模型的结果与线性CP轨迹和球面平面CP轨迹模型进行了比较，该模型适用于常用的MSK模型。改变CP轨迹对膝关节运动学具有显着影响，并在某些受试者中分别在1.03 bw和0.65 bw中改变了内侧和横向接触力。内侧/横向接触力的方向和幅度在受试者之间具有高度可变的变量，并且仅CPS的内侧横向移位不能确定接触力的增加/减少图案。建议的运动约束适用于来自各种关节模型的CP轨迹，以及从3D成像技术实验测量的CP轨迹。 （c）2018年elestvier有限公司保留所有权利。

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