下颈椎三维有限元模型的建立

采用新鲜尸体完整颈椎标本，CT扫描读取C5椎节各结构的三维空间坐标，确立有限元模型的几何边界；根据文献设置材料参数；运用三维有限元分析程序ANSYS5.5，采用实体建模法建立颈椎骨性半结构的三维有限元模型。建立的C5椎节骨性半结构三维有限元模型，共有关键点564个，节点2178个，4面体单元7854个。模型模拟了下颈椎的椎体皮质骨、松质骨、终板以及颈椎侧块、椎弓根、椎板、横突、棘突等脊椎后结构的材料特性。所建模型结构完整，空间结构测量准确度高，单元划分精细，重点突出，较为准确地模拟了下颈椎的形态结构和生物力学特点。

Three-dimensional finite elements model of lower cervical vertebrae

A fresh cadaver cervical spines was scanned by the computer assisted tomography(CT). According to the material properties from literature and the mathematical model of C 5 vertebrae based on CT scanning image of the fresh cadaver cervical spines, the three dimensional finite elements model (TDFEM) of C 5 vertebrae structure was constructed by ANSYS 5.5 software,which had 564 key points, 2 178 nodes and 7 854 tetrahedrons elements.Besides,cortical shell,cancellous core,endplates and posterior elements including lateral masses,pedicle,lamina,transverse and spinous processes were also simulated. The advantages of the model include intact structure, precise elements, outstanding key points and high measure accuracy.