胫骨模型对膝关节有限元分析结果影响的探讨

Study of Influence of Tibial Model on Finite Analysis Results of Knee Joint

目的:通过有限元法对膝关节进行力学仿真,探讨胫骨模型对膝关节生物力学行为的影响。方法:应用Mimics建立膝关节三维实体模型并对骨骼赋予不同的材料属性;使用Hypermesh建立膝关节三维网格模型,同时建立了不同胫骨长度的膝关节三维模型:在Abaqus中设置边界条件和软组织材料属性,施加载荷进行膝关节力学仿真。结果:通过有限元分析获得了膝关节主要软组织的应力和相互接触面积,得到胫骨上的Mises应力分布。结论:膝关节骨骼材料属性以及胫骨长度对膝关节软组织的力学行为基本没有影响,可在实际的对膝关节软组织的有限元分析中将骨性结构定义为刚体:胫骨上的Mises应力随骨骼材料属性和长度有明显的变化,在针对骨骼的有限元分析中需要建立完整的骨骼结构以及将骨骼划分为至少10种材料属性。

Objective： To discuss the effects of the bone model on the knee biomechanical behavior through the finite element analysis. Methods： The Mimics software is adopted to build the 3D knee models of knee and the Hypermesh is applied to reconstruct the 3D mesh models. Abaqus is used to simulate the biomechanical behavior. Results： The stress results and contact area of the knee soft structures and the tibial stress are achieved after the biomechanical simulation. Conclusions： It is found that the bone materials and tibial length have no effect on the biomechanical of the soft structures of knee joint. So the bone structure can be defined as rigid body in the finite element analysis of the soft structures of knee. The tibial stress changes obviously for the different bone materia ls and the tibial length. Thus it is necessary to establish the intact skeleton structure and to assign at least 10 kinds of bone material in the finite element analysis of bone structure.