正常下尺桡关节三维有限元模型的建立及验证

背景：国内外学者已应用有限元分析在前臂的桡骨骨折及其固定、尺骨骨折及其固定等方面进行了生物力学评价，但还未见应用该方法对下尺桡关节进行生物力学评价相关的文献报道。 目的：建立并验证下尺桡关节三维有限元模型，用于临床的生物力学研究。 方法：将1名健康男性志愿者右肱骨远端到腕关节中段的CT和MRI图像，导入Mimics10.01和ANSYS10.0中，建立下尺桡关节三维有限元模型，模拟体外生物力学试验，在横向拉伸、轴向压缩、旋前和旋后扭转4种工况下观测下尺桡关节各结构的应力分布，所得结果与文献报道的生物力学实测数据比较验证。 结果与结论：所构建的下尺桡关节有限元模型共有333 805个单元，508 384个节点，客观反映下尺桡关节真实解剖形态。所建模型在横向拉伸、轴向压缩、旋前和旋后扭转4种工况下，理论分析结果与生物力学实测数据一致。证实所建的下尺桡关节有限元模型真实性较高，可用于生物力学分析实验。

Construction and validation of a three-dimensional finite element model of the distal radioulnar joints

BACKGROUND: Finite element analysis, characterized by repeatable and comprehensive performance test, has been frequently utilized in biomechanics analysis of fracture and fixation, such as forearm fracture, but there are few studies on distal radioulnar joints. OBJECTIVE: To establish and validate a more precise three-dimensional (3D) finite element model (FEM) of distal radioulnar joint. METHODS: Data of CT and MRI sectional images, obtained from a healthy man, were inputed into MIMICS10.1 and ANSYS10.0 to generate 3D finite element model of distal radioulnar joint. Simulating under bending load, axial compression load and the torsion load conditions, the Vonmises stress distribution of distal radioulnar joint were detected and compared with the results of experiment in vitro for validation. RESULTS AND CONCLUSION: The model consisted of 333 805 elements and 508 384 nodes, which reflected the real geometric structure of the distal radioulnar joint objectively. Under bending, axial compression and the torsion load conditions, theoretical analysis results are consistent well in biomechanics. The current finite element model of the distal radioulnar joint can properly simulate the characteristic of the distal radioulnar joint in biomechanics testing.