【作者】 黄若昆； 谢鸣； 方真华； 赵晶晶； 李静； 勘武生；

【Author】 HUANG Ruo-kun;XIE Ming;FANG Zheng-hau;Department of Orthopaedics,Pu Ai Hospital of Tongji Medical College of Huazhong University of Science and Technology;

【机构】 华中科技大学同济医学院附属普爱医院足踝外科；

【摘要】 [目的]旨在建立可靠的距骨三维有限元模型,并对其进行分析与验证,为临床距骨损伤模拟仿真提供生物力学依据。[方法]对1例正常志愿者行足踝部64排CT扫描,层厚0.625 mm,无间隔。Mimics10.01重建三维图像,经手动编辑、区域增长、形态学操作等,生成后足部的三维模型,从后足部模型中提取距骨模型。对距骨进行面网格的优化处理后,导入Ansys 10.01中得到体网格模型。根据CT断层图像的灰度值完成模型材质的添加,生成最终的三维有限元模型。模拟研究对象单足静止站立的状态,距下关节面全约束,轴向压缩600 N截荷均匀、垂直分布于距上关节面,模拟人体单脚站立时距骨滑车面年所承受的主要负荷,加载后分析各部位应力。[结果]建立了精确距骨三维有限元模型。模型共有57 680节点、433 928个单元。通过应力云图距骨受力时最大位移在距骨体上部。[结论]利用Mimics和Ansys软件建立正常距骨有限元模型,具有较高真实性和精确度,可以很好的模拟距骨的生物力学特性,能满足临床距骨损伤模拟手术仿真分析的需要。更多还原

【Abstract】 [Objective]To establish a three-dimensional finite element model of the talus wiich can be used for biomechanic analysis in clinic.[Methods]The raw data obtained form a healthy adult man.His ankle was scanned by 64-slices computrerized tomography without any interval.Then the CT datas were inputed to 10.01 software and the files were imported to mimics 10.01,which gave the material properties according to CT sectional images of the gray value,and the final 3D finite element model of talus was generated.The static standing posture was simulates using the static finite element analysis.In ansys 10.0,single limb standing was simulated.Subtalar joint surface in the whole analysis process was fully constrained during the study period.The forces of 600 N were loaded on ankle articular surface.To detect the Vonmises stress distribution of the talus.[Results]Mimics and Ansys software can quickly establish a more accurate finite element model.The model consisted of 57 680 nodes and43 928 elements.Talus stress concentrated in the talus neck and posterior talar articular surface.[Conclusion]The established finite element model of talus has high reality and precision which can meet the needs of biomechanical research into talus injuries in a simulated clinic stiuation.更多还原