人体足主要骨-韧带结构三维有限元模型的建立及分析  

Construction of the Three-Dimensional Finite Element Model of Normal Human Foot Structure

作　　者：杨云峰[1] 俞光荣[1] 牛文鑫[2] 周家钤[1] 陈雁西[1] 黄四平[1] 王明鑫[1] 程黎明[1] 丁祖泉[2] 

机构地区：[1]同济大学附属同济医院骨外科,上海200065 [2]同济大学生命科学与技术学院生物医学工程研究所

出　　处：《中国运动医学杂志》2007年第5期542-546,551,共6页Chinese Journal of Sports Medicine

摘　　要：目的:建立正常人体足主要骨-韧带结构的三维有限元模型,为足部生物力学研究提供数字平台。材料和方法:获取正常青壮年男性的左足螺旋CT扫描图像,应用逆向工程原理,通过处理序列螺旋CT图片建立足部骨结构的三维几何模型,并对其进行有限元网格划分。足部关节软骨、韧带、肌腱和足底软组织通过解剖和文献数据模拟。同时,对7具新鲜尸体标本足作生物力学测试,分析计算有限元模型及生物力学测试中足部骨骼的应力、位移变化情况。结果:建立了包括170426个节点、118342个单元的关节、骨、软骨、韧带和足底软组织在内的正常人体左足骨骼及韧带结构的三维有限元模型,较客观地反映了人体足的解剖结构和力学特性。与新鲜尸体标本的生物力学测试结果比较,位移变化有相同趋势。结论:运用逆向工程原理可有效构建人体足的三维几何模型,在此基础上基于解剖和离体标本实验结果构建其生物力学有限元模型,可用于足部生物力学变化规律的可视化分析。Objective To construct a three-dimensional finite element model （FEM） of normal adult human foot in order to supply a digital platform for biomechanical research of human foot and an- kle. Methods A three-dimensional FEM of normal adult human left foot was established through helical CT images with the principles of reverse engineering （RE）, and meshed in the ANSYS 9.0 soft- ware. The foot bony structures, ligaments and plantar soft tissue were also simulated based on their anatomic characteristics and literature reviews. Meanwhile, seven normal fresh frozen adult cadaveric feet were tested by multi-material test machine and compared with the FEM result. Results A foot model was constructed including bones, cartilage, ligaments, and plantar soft tissue, which composed of 170426 nodes, 118342 units and was comparable to the anatomy and CT reconstruction images. The current FEM showed the same tendency in displacemens of the tarsal bones as compared with the ca- daveric experiment. Conclusion The application of principle of RE in biomechanical model construction is valid and reasonable. It could be optimized by the interference of anatomical data and biomechanical experiments and be used in further foot biomechanics research.

关 键 词：足 三维有限元模型 生物力学 测量 

分 类 号：R318.01[医药卫生—生物医学工程]