表面髋关节置换三维有限元模型的建立及意义

Establishment and significance of a three-dimensional finite element model of surface hip arthroplasty

背景:目前髋关节的三维有限元模型大都是基于人体尸骨数据或通过CAD重建获得的,其效果不够理想。目的:通过64排螺旋CT扫描提供数据,建立表面髋关节置换的三维有限元模型,拟为生物力学实验提供标准数学模型。方法:选择1名行表面髋关节置换后的成年男性志愿者,经X射线检查排除健侧髋关节疾患。螺旋CT扫描表面髋关节置换后患者所得数据导入Mimics软件。采用域值法建立三维立体模型,之后导入Abaqus软件,进行网格划分。建立起表面髋关节置换术后的三维有限元模型。结果与结论:建立了表面髋关节置换术后三维几何和有限元模型。表面髋关节置换模型分为三维六面体单元165886个,节点213343个。可见,通过Mimics软件、Abaqus软件可以利用表面髋关节置换术后患者薄层断面图像构建出其三维几何模型与三维有限元模型。该模型具有较高的形态学及力学仿真度。

BACKGROUND：Current hip three-dimensional finite element model is established based on human corpse data or CAD reconstruction,but the effect is not satisfactory.OBJECTIVE：To establish three-dimensional finite element model of surface hip arthroplasty using 64-slice spiral CT scanning data to provide a standard mathematical model for further biomechanical study.METHODS：An adult male volunteer who underwent surface hip arthroplasty was selected with no disease in the intact hip confirmed by X-ray.CT data of surface hip arthroplasty were imported into Mimics software.Three-dimensional model was established by threshold method and converted to volumetric mesh in the Abaqus software.So the three-dimensional finite element model of surface hip arthroplasty was established.RESULTS AND CONCLUSION：The three-dimensional geometry and finite element model of surface hip arthroplasty was established.The model included 165 886 hexahedron elements and 213 343 nodes.The three-dimensional geometry and finite element model can be constructed from slice section images with Mimics and Abaqus software.The model has a high degree of morphological and mechanical simulation.