足部三维有限元建模及其多姿态生物力学分析  

Three-dimensional finite element modeling of the foot and its multi-posture biomechanical analysis

作　　者：张雷蕾 王盟圣 徐大伟 黄鸿 杨永泰 Zhang Leilei;Wang Mengsheng;Xu Dawei;Huang Hong;Yang Yongtai(Quanzhou Institute of Equipment Manufacturing,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Quanzhou 362200,Fujian Province,China;School of Electrical and Control Engineering,North University of China,Taiyuan 030051,Shanxi Province,China)

机构地区：[1]中国科学院福建物质结构研究所,泉州装备制造研究所,福建省泉州市362200 [2]中北大学电气与控制工程学院,山西省太原市030051

出　　处：《中国组织工程研究》2021年第30期4799-4804,共6页Chinese Journal of Tissue Engineering Research

基　　金：泉州市高层次人才创新创业项目(2020C022R),项目负责人:王盟圣;泉州市科技计划项目(2019STS01),项目参与人:王盟圣、黄鸿。

摘　　要：背景:足部的生物力学特性和损伤机制一直是医生、运动科学研究人员重点关注的问题,而三维有限元分析已成为生物力学行为数值模拟的有效技术手段。目的:建立有效的足部有限元分析模型,分析足部不同着地姿态的生物力学特性。方法:采集1例健康成年男性的足部CT图像,用Mimics软件进行阈值分割得到三维点云数据,运用Geomagic软件进行模型的点云处理和优化,得到光滑的足部3D几何模型。再将几何模型导入Hypermesh软件完成有限元前处理工作,最后利用Abaqus软件进行求解计算。将仿真结果与足底压力测试结果进行对比,验证模型的有效性,再根据仿真得到的内部应力分布结果对足部多姿态生物力学特性进行分析。结果与结论:(1)提出的网格质量控制办法提高了有限元分析前处理划分的网格质量;在未显著提高计算成本的情况下,很好地解决了有限元分析模型不收敛的问题;(2)对足部不同姿态进行仿真分析发现:前掌先着地时,足部负荷集中于前掌,导致跖骨应力和足底筋膜受力增加,容易引起跖骨和足底筋膜的损伤;足跟先着地时,足部负荷集中于后跟,跟骨应力增加,加大了足跟痛和膝盖损伤的风险。(3)因此在运动过程中应避免长时间和高负荷的重复刺激,特别是已有相关疾患的人群更应该避开加重病情的运动方式。BACKGROUND:The biomechanical properties and injury mechanisms of the foot have always been a major concern for doctors and sports science researchers.Three-dimensional finite element analysis has become an effective technique for numerical simulation of biomechanical behavior.OBJECTIVE:To establish an effective finite element analysis model of the foot to analyze the biomechanical properties of the foot in different landing postures.METHODS:CT images of one foot of a healthy adult male were acquired.The images were segmented using Mimics to obtain the point cloud.To obtain a smooth 3D geometric model of the foot,Geomagic was used for the processing and optimization of the point cloud.After that,the geometric model was imported into Hypermesh to complete the finite element pre-processing.Finally,Abaqus was used to solving and calculating.The effectiveness of the finite element model was verified through the contrast of the simulation result and the measured plantar pressure.According to the internal stress distribution obtained from the simulation,the biomechanical characteristics of the foot in multiple landing postures were analyzed.RESULTS AND CONCLUSION:(1)The proposed mesh quality control method improved the quality of the mesh divided by the pre-processing of finite element analysis;it solved the problem of non-convergence of the finite element analysis model without significantly increasing the computational cost.(2)Simulation analysis of different postures of the foot found that:when the landing mode was forefoot strike,the foot load was concentrated on the forehand,leading to increased stress on the metatarsal bone and plantar fascia,which was easy to cause damage to the metatarsal bone and plantar fascia;when the landing mode was heel strike,the foot load was concentrated on the heel,and the stress on the heel bone was increased,which increased the risk of heel pain and knee injury.(3)Therefore,prolonged and repetitive stimulation with high loads should be avoided during exercise,especially for those who

关 键 词：足部模型 有限元分析 着地方式 生物力学 损伤机制 

分 类 号：R459.9[医药卫生—治疗学] R318[医药卫生—临床医学]