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首页> 外文期刊>Journal of Biomechanics >Probabilistic finite element prediction of knee wear simulator mechanics.
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Probabilistic finite element prediction of knee wear simulator mechanics.

机译：膝关节磨损模拟器力学的概率有限元预测。

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Computational models have recently been developed to replicate experimental conditions present in the Stanmore knee wear simulator. These finite element (FE) models, which provide a virtual platform to evaluate total knee replacement (TKR) mechanics, were validated through comparisons with experimental data for a specific implant. As with any experiment, a small amount of variability is inherently present in component alignment, loading, and environmental conditions, but this variability has not been previously incorporated in the computational models. The objectives of the current research were to assess the impact of experimental variability on predicted TKR mechanics by determining the potential envelope of joint kinematics and contact mechanics present during wear simulator loading, and to evaluate the sensitivity of the joint mechanics to the experimental parameters. In this study, 8 component alignment and 4 experimental parameters were represented as distributions and used with probabilistic methods to assess the response of the system, including interaction effects. The probabilistic FE model evaluated two levels of parameter variability (with standard deviations of component alignment parameters up to 0.5mm and 1 degrees ) and predicted a variability of up to 226% (3.44mm) in resulting anterior-posterior (AP) translation, up to 169% (4.30 degrees ) in internal-external (IE) rotation, but less than 10% (1.66MPa) in peak contact pressure. The critical alignment parameters were the tilt of the tibial insert and the IE rotational alignment of the femoral component. The observed variability in kinematics and, to a lesser extent, contact pressure, has the potential to impact wear observed experimentally.
机译：最近开发了计算模型来复制Stanmore膝盖磨损模拟器中存在的实验条件。通过与特定植入物的实验数据进行比较，验证了这些有限元（FE）模型，这些模型提供了评估全膝关节置换（TKR）力学的虚拟平台。像任何实验一样，在组件对齐，负载和环境条件中固有地存在少量可变性，但是该可变性先前未包含在计算模型中。当前研究的目的是通过确定磨损模拟器加载过程中存在的关节运动学和接触力学的潜在包络，来评估实验可变性对预测TKR力学的影响，并评估关节力学对实验参数的敏感性。在这项研究中，将8个组件对齐和4个实验参数表示为分布，并与概率方法一起使用以评估系统的响应，包括相互作用效应。概率有限元模型评估了两个级别的参数可变性（组件对齐参数的标准偏差最大为0.5mm和1度），并预测了前后前后（AP）平移的最大可变性为226％（3.44mm）在内部（IE）旋转中达到169％（4.30度），但在峰值接触压力下不到10％（1.66MPa）。关键的对准参数是胫骨插入物的倾斜度和股骨组件的IE旋转对准。在运动学上观察到的变化以及在较小程度上的接触压力都有可能影响实验观察到的磨损。

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