中国组织工程研究 ›› 2012, Vol. 16 ›› Issue (4): 593-596.doi: 10.3969/j.issn.1673-8225.2012.04.005

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

基于CT图像和逆向工程方法建立正常人体腰椎三维有限元模型★◆

郝  剑1,朴  哲1,李继海1,李瓦里1,牟广韬1,蒿俊行1,沈忆新2,牛文鑫3   

  1. 1天津市南开医院骨科,天津市  300100;2苏州大学附属第二医院骨科,江苏省苏州市  215004;3北京航空航天大学生物与医学工程学院生物力学与力生物学教育部重点实验室,北京市  100191
  • 收稿日期:2011-09-01 修回日期:2011-11-08 出版日期:2012-01-22
  • 通讯作者: 沈忆新,主任医师,教授,苏州大学附属第二医院骨科,江苏省苏州市 215004 laser1977@163.com
  • 作者简介:郝剑★,男,1977年生,山东省德州市人,汉族,主治医师,2008年苏州大学毕业,硕士,主要从事脊柱外科,创伤骨科研究。 laser19770912@163.com

Establishment of a normal human lumbar three-dimensional finite element model based on CT image and reverse engineering methods

Hao Jian1, Piao Zhe1, Li Ji-hai1, Li Wa-li1, Mu Guang-tao1, Hao Jun-hang1, Shen Yi-xin2, Niu Wen-xin3   

  1. 1Department of Orthopedics, Tianjin Nankai Hospital, Tianjin  300100, China; 2Department of Orthopedics, Second Affiliated Hospital of Soochow University, Suzhou  215004, Jiangsu Province, China; 3Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing  100191, China
  • Received:2011-09-01 Revised:2011-11-08 Online:2012-01-22
  • Contact: Shen Yi-xin, Chief physician, Professor, Department of Orthopedics, Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu Province, China laser1977@163.com
  • About author:Hao Jian★, Master, Attending physician, Department of Orthopedics, Tianjin Nankai Hospital, Tianjin 300100, China laser19770912@163.com

摘要:

背景:利用有限元法可以分析静止及活动时正常脊柱的生物力学,并预测应力时的风险。
目的:建立腰椎L3~L5三维有限元模型。
方法:选取一名健康30岁男性志愿者L3~L5薄层CT扫描图像,使用工具软件 Geomagic 和 Ansys,应用逆向工程原理构建三维有限元模型,设定边界条件进行加载,记录角位移及应力集中部位,计算模型的平均刚度。
结果与结论:建立L3~L5椎体三维有限元模型,包括椎体、韧带、椎间盘、纤维环和小关节,模型总单元数51 905个,通过定量和定性两方面验证模型有效。说明所建立的L3~L5椎体三维有限元模型符合脊柱生物力学特征,可用于进一步脊柱生物力学研究。

关键词: 逆向工程, 腰椎, CT, 三维有限元, 数字化骨科

Abstract:

BACKGROUND: Finite element method can analyze biomechanics of normal human spinal under stationary and activity, and also can predict risk of stress.
OBJECTIVE: To establish a three-dimensional finite element model of normal human L3-L5 motion segment.
METHODS: In this study, a detailed L3-L5 level three-dimensional finite element model of a normal aged 30 men was established with the aid of two softwares, Geomagic and Ansys, which can derive a three-dimensional finite element model from CT images. Then border conditions and load were set. Angular displacement and stress concentration sites were recorded. Average model stiffness was calculated.
RESULTS AND CONCLUSION: A finite element model of the spinal segments (L3-L5) was developed, including vertebrae, ligament, disc, fibrous ring and the facet joints. The model had 51 905 units. The model was validated by quantitative and qualitative. Three-dimensional finite element model of L3-L5 motion segment is approximate to the natural biomechanical of spine and it can be used for further study.

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