Wallis腰椎非融合系统有限元模型的建立

Establishment of finite element model of Wallis non-fusion system for human lumbar

目的构建Wallis腰椎非融合系统有限元模型,为临床应用提供生物力学基础。方法 8例志愿者采用连续螺旋CT扫描,将获得的断层Dicom格式图像,导入Materialise Mimics10.01软件,定义骨组织阈值、提取各层面轮廓线、图像边缘分割、三维重建L4、5椎体及椎间盘三维模型,将重建的模型以.stl格式保存,导入Materialise3-Matic4.3软件,进行三角面片优化;在AutoCAD 2009软件中建立Wallis系统模型,以.stl格式保存,导入Materialise 3-Matic4.3软件,进行三角面片优化,将重建的Wallis模型按标准手术模式与腰椎模型拟合,导入Ansys10.0软件进行赋值和网格划分,生成有限元模型。结果重建的三维模型可以精确的模拟Wallis非融合系统固定情况。结论应用CT扫描技术,图像Dicom标准,Mimics软件能直接与Ansys软件进行对接,并能根据CT值直接赋值使Wallis腰椎非融合系统有限元模型的建立更加快捷、精确。

Objective To establish finite element model of Wallis non-fusion system which provide a foundation of biomechanics for clinical application.Methods Eight adult male volunteers were subjected to CT scanner.CT scanning images were imported into Materialise Mimics 10.01 software.Bone organization threshold,outline,edge were defined and edited selectively.Three-models of L4,5 lumbar and its disc were reconstructed and saved in STL format.These models then imported into Materialise 3-Matic 4.3 software to re-mesh.Three-dimensional model of Wallis system was established using autoCAD 2009 software,then merging with L4、5 models.The merging models then transformed into Ansys 10.0 software for pre-processor.Results A realistic appearance and calculation accuracy 3D finite element model of Wallis and L4、5 lumbar were established.Conclusion Applications of sophisticated CT scanning technique,the CT scanner images,Mimics software directly dock with Ansys software can directly assign values,which make the establishment of three-dimensional finite element model of Wallis and L4、5 lumbar faster and more accurate.