Explicit finite element modeling of total knee replacement mechanics
Explicit finite element modeling of total knee replacement mechanics
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DOI：
10.1016/j.jbiomech.2004.02.046
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发表时间：
2005-02-01
影响因子：
2.4
通讯作者：
Rullkoetter, PJ
中科院分区：
文献类型：
--
作者：
Halloran, JP;Petrella, AJ;Rullkoetter, PJ
关节运动学和接触力学决定了当前全膝关节置换（TKR）器械的成功。高效的计算机模型提供了评估这些特征的有效方法。预测的接触应力和胫骨-股骨和髌骨-股骨界面关节面面积表明了潜在的临床性能。以前的有限元（FE）膝关节模型通常用于预测静态或准静态载荷条件下的接触应力和/或面积。显式动态有限元分析最近已被用于有效地预测TKR运动学和接触力学在动态加载条件。本研究的目的是开发并通过实验验证包含胫股关节和髌股关节的显式FE TKR模型。为了提高计算效率，我们开发了刚体分析，可以合理地再现运动学，接触压力分布，和接触面积的一个完全deformabie system.Results从可变形模型表明，髌股和胫股运动学与实验膝关节模拟器测量结果吻合良好。刚体分析的运动学结果与完全变形模型的结果几乎相同。并且接触压力和接触面积的相关性是可接受的，因为分析时间大大减少。研究的组件网格密度对预测的运动学几乎没有影响，特别是对于髌骨组件，对预测的接触压力和面积的影响也很小。这些分析表明，在低计算成本，力控制动态模拟的步态周期可以产生有用的和可预测的结果。(C)2004 Elsevier Ltd.保留所有权利。
Joint kinematics and contact mechanics dictate the success of current total knee replacement (TKR) devices. Efficient computer models present an effective way of evaluating these characteristics. Predicted contact stress and area due to articulations at the tibio-femoral and patello-femoral interfaces indicate potential clinical performance. Previous finite element (FE) knee models have generally been used to predict contact stresses and/or areas during static or quasi-static loading conditions. Explicit dynamic FE analyses have recently been used to efficiently predict TKR kinematics and contact mechanics during dynamic loading conditions. The objective of this study was to develop and experimentally validate an explicit FE TKR model that incorporates tibio-femoral and patello-fiemoral articulations. For computational efficiency, we developed rigid body analyses that can reasonably reproduce the kinematics, contact pressure distribution, and contact area of a fully deformabie system.Results from the deformable model showed that the patello-femoral and tibio-femoral kinematics were in good agreement with experimental knee simulator measurements. Kinematic results from the rigid body analyses were nearly identical to those from the fully deformable model. and the contact pressure and contact area correlation was acceptable given the great reduction in analysis time. Component mesh density studied had little effect on the predicted kinematics, particularly for the patellar component, and small effects on the predicted contact pressure and area. These analyses have shown that, at low computational cost, a force-control dynamic simulation of a gait cycle can yield useful and predictable results. (C) 2004 Elsevier Ltd. All rights reserved.