正常男性全腰椎三维有限元模型的建立及探讨  

Establishment and validation of normal human L1-L5 lumbar three-dimensional finite element model

作　　者：朱震奇[1] 刘辰君[1] 王捷夫[1] 王凯丰[1] 黄志新[1] 王伟达[1] 刘海鹰[1] 

机构地区：[1]北京大学人民医院脊柱外科,100044

出　　处：《中华医学杂志》2014年第37期2919-2922,共4页National Medical Journal of China

摘　　要：目的 建立正常人体全腰椎L1-L5三维有限元模型,并验证其有效性.方法 选取1名健康男性志愿者L1-L5薄层CT扫描图像,利用工具软件Mimics、Geomagic和Ansys,构建全腰椎L1-L5三维有限元模型,设定边界条件、确定单元类型、划分有限元网格并进行加载计算,计算模型在前屈、后伸、（左）侧屈、（右）旋转工况下的平均刚度,与文献结果对照验证模型的有效性.结果 建立了正常人体全腰椎L1-L5三维有限元模型,整个模型共有459 340个单元和661 938个节点.约束模型L5椎体下终板,在L1椎体上终板施加500 kg·m·s^-2垂直压缩载荷,并使此载荷均匀分布于表面各节点,随后在L1椎体上终板施加10 kg· m^2·s^-2前屈、后伸、（左）侧屈和（右）旋转力矩载荷并计算出各方向平均刚度,其结果与其他学者的实验结果相比较为接近.结论 本实验所建立的全腰椎L1-L5三维有限元模型是有效的,可以用于正常模型和手术模型的生物力学模拟和分析.Objective To create and validate a L1-L5 lumbar three-dimensional finite element model.Methods The L1-L5 lumbar spines of a male healthy volunteer were scanned with computed tomography （CT）.And a L1-L5 lumbar three-dimensional finite element model was created with the aid of software packages of Mimics,Geomagic and Ansys.Then border conditions were set,unit type was determined,finite element mesh was divided and a model was established for loading and calculating.Average model stiffness under the conditions of flexion,extension,lateral bending and axial rotation was calculated and compared with the outcomes of former articles for validation.Results A normal human L1-L5 lumbar three-dimensional finite element model was established to include 459 340 elements and 661 938 nodes.After constraining the inferior endplate of L5 vertebral body,500 kg · m · s^-2 compressive loading was imposed averagely on the superior endplate of L1 vertebral body.Then 10 kg · m^2 · s^-2 moment simulating flexion,extension,lateral bending and axial rotation were imposed on the superior endplate of L1 vertebral body.Eventually the average stiffness of all directions was calculated and it was similar to the outcomes of former articles.Conclusion The L1-L5 lumbar three-dimensional finite element model is validated so that it may used with biomechanical simulation and analysis of normal or surgical models.

关 键 词：腰椎 限定因素分析 人体模型 生物力学 

分 类 号：R681.5[医药卫生—骨科学]