Lu Chang-huai, Yu Bin, Chen Hui-qiang, Lin Qing-rong
Department of Orthopedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
Nan Fang Yi Ke Da Xue Xue Bao. 2010 Oct;30(10):2273-6.
To develop a three-dimensional (3D) finite element model of the human ankle with fine details and analyze the stress distribution on the talus during different gait phases.
Mimics13.0 and Geomagic10.0 software were used for geometric reconstruction of the ankle based on the 3D CT data of the foot. The model was meshed and assigned with the material properties in Hypermesh10.0 software. The model was then imported to Abaqus6.9, and the stress condition of the talus during the 3 phases (heel-strike, midstance, push-off) of normal gait was simulated to calculate the stress distribution within the bone.
The three-dimensional finite element model of the ankle established consisted of 21 865 nodes and 73 440 elements. The stress distribution within the bone in 3 phases of normal gait differed significantly. The peak von Mises stress on the talus dome, from the heel-strike to push-off phases, was 3.0 MPa, 4.3 MPa and 4.8 MPa, as compared to 1.3 MPa, 1.9 MPa and 2.8 MPa on the talar neck, 2.8 MPa, 3.0 MPa, and 3.4 MPa on the talonavicular joint surface, and 2.2 MPa, 1.8 MPa and 1.5 MPa on the subtalar joint, respectively.
The finite element model of the talus shows a good response against the experimental data and can be used to simulate the biomechanic experiment of the talus.
构建具有精细细节的人体踝关节三维（3D）有限元模型，并分析不同步态阶段距骨上的应力分布。
基于足部的3D CT数据，使用Mimics13.0和Geomagic10.0软件对踝关节进行几何重建。在Hypermesh10.0软件中对模型进行网格划分并赋予材料属性。然后将模型导入Abaqus6.9，模拟正常步态的3个阶段（足跟触地、支撑中期、蹬离期）距骨的应力状况，以计算骨内的应力分布。
所建立的踝关节三维有限元模型由21 865个节点和73 440个单元组成。正常步态3个阶段骨内的应力分布有显著差异。距骨穹顶处的von Mises应力峰值，从足跟触地到蹬离期分别为3.0 MPa、4.3 MPa和4.8 MPa，距骨颈处分别为1.3 MPa、1.9 MPa和2.8 MPa，距舟关节面处分别为2.8 MPa、3.0 MPa和3.4 MPa，距下关节处分别为2.2 MPa、1.8 MPa和1.5 MPa。
距骨有限元模型对实验数据显示出良好的响应，可用于模拟距骨的生物力学实验。
