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  

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

作　　者：郝剑 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] 

机构地区：[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

出　　处：《中国组织工程研究与临床康复》2012年第4期593-596,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

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51905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。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.

关 键 词：逆向工程 腰椎 CT 三维有限元 数字化骨科 

分 类 号：R318[医药卫生—生物医学工程]