基于CT图像腰椎L4~L5节段有限元模型建立与分析

发布时间：2018-02-13 09:06

本文关键词： 腰椎L~L节段 CT图像有限元模型生物力学特性　出处：《中国生物医学工程学报》2014年04期 　论文类型：期刊论文

【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。
[Abstract]:Based on CT image, image processing and finite element analysis software, a complete 3D finite element model of L4 / L5 segment of human lumbar vertebrae was established by using hexahedron mesh. The validity of the model is verified and analyzed. Then the three-dimensional finite element model of lumbar vertebrae is established by generating hexahedron solid element by using scanning and stretching methods for two-dimensional quadrilateral element. In addition, the finite element model of lumbar vertebrae with different element number and unit type was established for comparison. The deformation and displacement of lumbar vertebrae under axial force and 6 directions torque and the stress distribution of intervertebral disc were observed. The original model has 110,762 units and 111,644 nodes. The displacement of the model under the axial compression force of 500 ~ 1000 ~ 1 500 ~ (2 000) N is 0.34 ~ 0. 65 卤0. 91 卤1 ~ (21) mm respectively, and the displacement of the model is forward flexion and backward extension. Under lateral bending and torsion conditions, the joint motion is 5.69 掳/ 2.28 掳/ 3.41 掳and 1.29 掳, respectively. The maximum stress distribution of the end plate is consistent with the results of previous studies. The fine finite element model with hexahedron element can give consideration to the computational efficiency and accuracy of the model. The model accords with the general biomechanical characteristics of lumbar vertebrae and can be used to simulate biomechanical experiments and further study of spinal biomechanics.
【作者单位】：上海理工大学医疗器械与食品学院;上海市杨浦区中心医院;
【基金】：国家自然科学基金(51106099) 上海市教委科研创新项目(12YZ109)
【分类号】：R318.01

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