脊柱胸腰段三维有限元模型的建立与验证  

Establishment and validation of the finite element model of thoracolumbar motion segment

作　　者：陈浩[1] 张锦洪[1] 贺增良[1] 

机构地区：[1]东南大学附属第二医院骨科,江苏南京210003

出　　处：《江苏大学学报（医学版）》2014年第1期72-75,共4页Journal of Jiangsu University：Medicine Edition

摘　　要：目的:建立正常脊柱胸腰段三维有限元模型并验证其有效性。方法:选择一位健康成人志愿者,通过CT扫描获得胸腰段数据,Mimics 10.01软件生成T12-L2椎骨三维模型,Geomagic 11.0、UG 7.0生成三维实体模型,Hypermesh 10.0划分网格,并建立椎间盘、韧带等结构,Abaqus 6.9.1加载求值,施加500 N垂直压缩力,7.5 Nm的前屈、后伸、左右侧屈及左右轴向旋转力矩,分三个载荷步(2.5、5.0和7.5 Nm)施加,观察T12-L2节段运动范围。结果:建立了正常人胸腰段三维有限元模型,整个模型共90 014个单元,158 684个节点。对模型进行前屈、后伸、左右侧屈和左右旋转作用,T12-L2节段的力矩-旋转角度曲线与文献体外实验数据基本吻合。结论:本实验建立的正常脊柱胸腰段三维有限元模型有效,可进行进一步的生物力学实验研究。Objective： To establish the 3D finite element model of thoracolumbar motion segment and to verify the validity of the finite element model. Methods： Spiral CT scan was performed in the T12 -L2 motion segments of a male volunteer without any spinal disease. The CT data was imported to the software of Mimics 10.01 to create the geometric model of the T12-L2 motion segment which was reconstructed to the solid model by the Geomagic 11.0 and UG 7.0 software. The intervertebral discs and ligaments were constructed and the intact model was meshed in the Hypermesh 10.0 software. Inter-segmental ranges of motion were calculated after T12-L2 being subjected to loads of moments 7.5 Nm （in three steps： 2.5, 5.0 7.5 Nm） and preload and L2 was rigidly fixed while loads were applied at the T12 for flexion, extension, lateral bending and axial rotation. For validation of the model, their predicted inter-segmental ranges of motion was compared with the results in the experimental study. Results：The established final intact model consisted of 90,014 elements and 158,684 nodes. The curve of moments and angular motion were in good agreement with the published experimental results. Conclusion：The 3D finite element model of thoracolumbar motion segment can simulate the natural condition and facilitate the further biomechanical research.

关 键 词：胸腰椎 有限元 生物力学 

分 类 号：R318.01[医药卫生—生物医学工程]