摘要
目的:建立寰枢椎三维有限元模型,为重建寰枢椎的稳定性提供生物力学依据。方法:对颈枕部C0～3标本行CT扫描,获取数据集,通过Mimics10.0软件选取灰度值大于-250 Hu得到C0～3骨和韧带的三维模型,并用Mimics10.0软件对模型进行修饰,以OUT格式导入有限元软件Patran2005中生成四面体网格模型,再输入Mimics软件对模型赋值,完成寰枢椎三维有限元模型,包括密质骨、松质骨及韧带,模型能够高度模拟颈椎结构与材料特性,结构完整,模型节点数9 178,单元数40 356。在模型C3的下缘进行边界约束(六自由度为零),在C0处进行前屈/后伸、左/右侧弯、左/右旋转方向1.5 Nm的加载,分析寰枢椎之间的三维运动及各部位的应力。并在实验室以相同加载方法下测量其三维运动范围。分别进行统计学分析。结果:寰枢外侧关节面及枢椎体前部是应力集中部位,寰枢椎间的三维运动(前屈/后伸5.48°/9.85°、左/右侧弯4.69°/4.93°、左/右轴向旋转31.28°/30.56°)与实验室测量(前屈/后伸8.10°/8.49°、左/右侧弯4.79°/4.93°、左/右轴向旋转28.2°/29.3°)相当。结论:利用Mimics和Patran2005建立寰枢椎有限元模型,具有较高的真实性和精确度,能够模仿寰枢椎生物力学分析。
Objective：Toestablish the three dimensional（3D）finite elementmodel（FEM）ofatlantoaxialvertebra（AAV）in order to provide the biomechanical base for the stability of atlantoaxial reconstruction.Methods：After the occipitocervical specimen（C0～3）was scanned on a spiral computed tomography,the scanning data were collected,and then inputted into software Mimics 10.0 to extract the 3D model of C0～3 bone and ligament by gray scale more than-250 Hu,and then was remodeled.Subsequently,it was imported with the finite element analysis（FEA）software Patran2005 by the OUT format to produce tetrahedron grid（TG）model.Then the TG model was inputted into software Mimics10.0 again and the material parameter was distributed.So 3D FEM of AAV was completed,which included cortical bone,cancellous bone and ligament.It highly simulated the integrated structure and material property of AAV.The node and element number of this model was 9 178 and 40 356 respectively.The C3s’ inferior boarder of the model was restrained（six-freedom-degree was zero）.The 3D range of motion（3DM）C1 relative to C2 was measureda,nd the stress of various sections of AAV was analysed by loading 1.5 Nm at C0 under the conditions of flexion/extension,left/right lateral bending,and left/right axial rotation by Patran2005.3DM C1 relative to C2 was measured under similar loading method in laboratory.Then data in the two groups were collected and statistically analysed.Results：The lateral facets of atlantoaxial joint and the anterior part of C2 body were the stress concentration regions and also high bone mineral density regions.3DM C1 relative to C2 on FEA（flexion/extension,5.48°/9.85°,left/right lateral bending,4.69°/4.93°,and left/right axial rotation,31.28°/30.56°）was similar to the experiment（flexion/extension,8.10°/8.49°l,eft/right lateral bending,4.79°/4.93°l,eft/right axial rotation,28.2° /29.3°）.Conclusion：The 3D FEM of AAV,constructed by combined usage of Mimics and Patran2005i,s valid and accurate,an
出处
《重庆医科大学学报》
CAS
CSCD
北大核心
2010年第12期1847-1850,共4页
Journal of Chongqing Medical University
基金
重庆市卫生局项目(编号:05-2-166)
关键词
寰枢椎
生物力学
有限元分析
重建
Atlantoaxial vertebra
Biomechaniecs
Finite element analysis
Reconstruction
