肱骨远端三维有限元模型的建立及生物力学分析

Three-dimensional finite element model of the distal humerus and the related biomechanics analysis

背景:采用有限元分析法进行骨与关节的生物力学分析得到了广泛应用,但是关于肱骨远端的有限元分析较少,且所建模型粗糙,方法繁琐。目的:建立肱骨远端的三维有限元模型,并模拟不同受力状态下的应力分布及应变特征。方法:通过对正常成年男性肘关节的多排螺旋CT扫描,获得连续断层图片,导入Mimics医学建模软件生成实体模型后,应用大型通用有限元分析软件ANSYS10.0,进行网格划分、材料属性赋值生成有限元模型。约束边界条件,模拟肱骨远端轴向受力,得出肱骨远端有限元模型上的应力分布与应变结果。结果与结论:建立的肱骨远端有限元模型总单元数为6292,总节点数为10232。肱骨远端在轴向载荷状态下的应力集中主要位于内、外侧柱区域。提示建立的有限元模型精确度高,符合肱骨远端的临床特点,较好地模拟了肱骨远端的生物力学特性。

BACKGROUND：Finite element analysis in biomechanics research of bone and joint has been widely used,but the finite element analysis of the distal humerus is less,and the model is rough,the method is cumbersome.OBJECTIVE：To establish a three-dimensional finite element model of the distal humerus,and to simulate under different loading the stress distribution and strain characteristics.METHODS：The raw data were obtained from a normal adult male.His elbow was scanned by spiral CT scans without any interval.Then the CT images were inputted into the Mimics,and produced a meshed three-dimensional surface image of the distal humerus.The three-dimensional model was inputted into the ANSYS 10.0,to create the finite element model following meshing and material property assignment.The model was constrained boundary conditions and applied axial load.Through constraining the boundary conditions and applied axial load,the stress distribution and strain results on the finite element model of the distal humerus were obtained.RESULTS AND CONCLUSION：The finite element model of the distal humerus was established with total unit number of 6 292,total node number of 10 232.When axial load was applied,the stress of the distal humerus emphasized at the medial and lateral column regions.The results indicate that the finite element model has high accuracy,and the clinical features are consistent with those of the distal humerus,so the model can properly simulate the biomechanical properties of the distal humerus.