基于CT图像腰椎L4～L5节段有限元模型建立与分析

doi:10.3969/j.issn.0258-8021. 2014. 04.014

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摘要基于CT图像结合图像处理及有限元分析软件采用六面体网格建立完整的人体腰椎L4～L5活动节段三维有限元模型，并对模型有效性进行验证与分析。用块状化分割方法对腰椎模型进行几何处理，然后对二维四边形单元使用扫略和拉伸等方法生成六面体实体单元从而建立三维腰椎有限元模型，并另外建立单元数量和单元类型不同的腰椎有限元模型用以对比。观察腰椎在轴向力和6个方向的扭矩作用下的变形和位移以及椎间盘的应力分布情况。建立的原始模型共有110 762个单元，111 644个节点，模型在500、1000、1 500、2 000 N轴向压缩力作用下的位移分别为0.34、0.65、0.91、1.21 mm，在前屈、后伸、侧弯和扭转工况下关节活动度分别为5.69°、2.28°、3.41°和1.29°，终板最大应力分布规律与前人研究结果一致。用六面体单元划分网格的精细有限元模型可兼顾模型的计算效率及精度，所建模型符合腰椎一般生物力学特点，可用于模拟生物力学实验及对脊柱生物力学的进一步研究。

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	方新果¹赵改平^1*王晨曦^{1 &n}

关键词 ：腰椎L4～L5节段, CT图像, 有限元模型, 生物力学特性

Key words： L4～L5 lumbar motion segment CT images finite element model biomechanical properties

基金资助:国家自然科学基金(51106099)，上海市教委科研创新项目(12YZ109)

引用本文:

方新果¹赵改平^1*王晨曦^{1 &n. 基于CT图像腰椎L4～L5节段有限元模型建立与分析[J]. 中国生物医学工程学报, 2014, 33(4): 487-492.

FANG Xin Guo¹ZHAO Gai Ping^1* WANG Chen Xi¹BAI Lei Lei¹YAN Wen Tao^{1 &n. Construction and Analysis of Finite Element Model of L4～L5 Lumbar Motion Segment from CT Images. journal1, 2014, 33(4): 487-492.}}

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http://cjbme.csbme.org/CN/10.3969/j.issn.0258-8021. 2014. 04.014 或 http://cjbme.csbme.org/CN/Y2014/V33/I4/487

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