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A Parametric Approach to Numerical Modeling of TKR Contact Forces

机译：TKR接触力数值建模的参数方法

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摘要

In vivo knee contact forces are difficult to determine using numerical methods because there are more unknown forces than equilibrium equations available. We developed parametric methods for computing contact forces across the knee joint during the stance phase of level walking. Three-dimensional contact forces were calculated at two points of contact between the tibia and the femur, one on the lateral aspect of the tibial plateau, and one on the medial side. Muscle activations were parametrically varied over their physiologic range resulting in a solution space of contact forces. The obtained solution space was reasonably small and the resulting force pattern compared well to a previous model from the literature for kinematics and external kinetics from the same patient. Peak forces of the parametric model and the previous model were similar for the first half of the stance phase, but differed for the second half. The previous model did not take into account the transverse external moment about the knee and could not calculate muscle activation levels. Ultimately, the parametric model will result in more accurate contact force inputs for total knee simulators, as current inputs are not generally based on kinematics and kinetics inputs from TKR patients.
机译：使用数值方法很难确定体内的膝盖接触力，因为与平衡方程相比，未知的力更多。我们开发了用于在水平行走的站立阶段计算整个膝关节接触力的参数方法。在胫骨和股骨之间的两个接触点计算三维接触力，一个在胫骨平台外侧，一个在内侧。肌肉激活在其生理范围内参数变化，从而产生接触力的解空间。所获得的解决方案空间相当小，并且与同一文献中的运动学和外部动力学方面的文献文献中的先前模型相比，所产生的力模式很好。在站立阶段的前半部分，参数模型和先前模型的峰值力相似，但在后半部分则不同。先前的模型未考虑膝盖周围的横向外部力矩，因此无法计算肌肉激活水平。最终，参数模型将为全膝关节模拟器带来更准确的接触力输入，因为当前输入通常不基于TKR患者的运动学和动力学输入。

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