中国组织工程研究 ›› 2013, Vol. 17 ›› Issue (30): 5472-5476.doi: 10.3969/j.issn.2095-4344.2013.30.009

• 数字化骨科 digital orthopedics • 上一篇    下一篇

儿童肱骨三维有限元建模及验证

阮世捷,申  丛,李海岩,贺丽娟,翟广凤   

  1. 天津科技大学损伤生物力学与车辆安全工程中心,天津市  300222
  • 收稿日期:2012-03-26 修回日期:2013-03-29 出版日期:2013-07-23 发布日期:2013-07-23
  • 通讯作者: 申丛,硕士,天津科技大学损伤生物力学与车辆安全工程中心,天津市 300222
  • 作者简介:阮世捷☆,男,1954年生,广东省人,汉族,1994年美国韦恩州立大学生物医学工程系毕业,博士,教授,主要从事生物医学工程及车辆安全方向的研究。 Cong8792@qq.com

Construction and identification of humerus three-dimensional finite element model in children

Ruan Shi-jie, Shen Cong, Li Hai-yan, He Li-juan, Zhai Guang-feng   

  1. Injury Biomechanics and Vehicle Safety Engineering Center, Tianjin University of Science and Technology, Tianjin  300222, China
  • Received:2012-03-26 Revised:2013-03-29 Online:2013-07-23 Published:2013-07-23
  • Contact: Shen Cong, Master, Injury Biomechanics and Vehicle Safety Engineering Center, Tianjin University of Science and Technology, Tianjin 300222, China
  • About author:Ruan Shi-jie☆, M.D., Professor, Injury Biomechanics and Vehicle Safety Engineering Center, Tianjin University of Science and Technology, Tianjin 300222, China Cong8792@qq.com

摘要:

背景:有限元数值模拟力学实验方法是对人体进行生物力学结构研究的有效手段。
目的:建立正常6岁健康儿童肱骨的三维有限元模型。
方法:使用某6岁儿童志愿者的人体CT数据,导入到Mimics 10.01软件中,应用阈值分割的方法进行肱骨三维重建。运用Geomagic Studio 12.0对模型表面进行表面优化处理及曲面片的划分,然后使用TrueGrid软件进行网格划分,最后对其进行材料属性赋值,完成有限元模型的构建。施加边界条件及约束,模拟肱骨的三点弯曲试验,输出模拟结果。
结果与结论:建立完成的肱骨有限元模型包括3 024个节点,8节点六面体单元1 875个,实验分别加载0.01 m/s和3 m/s的动态载荷,肱骨中部均发生断裂,载荷-位移曲线与尸体试验结果近似。模拟结果显示,儿童肱骨的有限元模型仿真结果与尸体试验结果较为接近,有限元仿真法可以很好的模拟人体骨骼的物理特性。

关键词: 骨关节植入物, 数字化骨科, 肱骨, 儿童, 有限元模型, 三点弯曲试验, 载荷-位移, 生物力学分析

Abstract:

BACKGROUND: Mechanical experiment of finite element numerical simulation is the effective method to research the biomechanical structure of human body.
OBJECTIVE: To establish the three-dimensional finite element model of a normal 6-year-old child’s humerus.
METHODS: CT images of a 6-year-old child volunteer were imported to the Mimics 10.01 software. The threshold segmentation method was used to rebuild the humerus three-dimensional model. The surface optimization treatment and surface patches dicision were performed on the surface of the model with Geomagic Studio 12.0 software. Then the mesh generation was completed in the software TrueGrid. Finally, the material properties were set and the finite element model was completed. The boundary conditions and constrains were exerted to simulate the three-point-bending test of humeurs. After the simulation, the results were outputted.
RESULTS AND CONCLUSION: The humerus finite element model included 3 024 nodes and 18 758 nodes- hexahedron elements. The 0.01 m/s and 3 m/s dynamic loads were loaded respectively, then the central humerus fracture occurred and the load-displacement curve was close to the cadaver test results. The simulation results show that the simulation results of children humerus finite element model are close to the cadaver’s test, and the finite element simulation method can simulate the physical properties of the human skeleton very well.

Key words: bone and joint implants, digital orthopedics, humerus, children, finite element model, three-point bending test, load-displacement, biomechanical analysis

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