颈椎三维有限元模型的建立及意义

Three-dimensional finite element model of a cervical unit(c4-c7)

目的 :建立颈椎 (C4～C7)三维有限元模型 ,以期应用于临床实验研究。方法 :根据正常中年女性CT与CT重建片 ,采用CAD数据处理技术 ,输入相关的材料特性 ,构建C4～C7三维有限元模型。模型包括颈C4～C74个椎体、C4 / 5～C6 / 73个椎间盘以及后部结构与主要的 5条韧带。共 2 178个三维固体 2 0节点有限元结构。在1 8Nm作用力下 ,观察节段运动与力 位移反应。对比国内外的实验结果进行检验。结果 :生物力学实验结果与以往实验模型结果基本相符。结论 :所建立的颈椎三节段有限元模型可以模拟颈椎生物力学实验。

Objective:To develop a detailed,three dimensional,finite element model of a human cervical spine and validated against available experimental data for the biomechanic study of the cervical spine.Method:The CT scans were obtained from a normal woman aged 38 years old,using thickness 2 0mm slices at 2 0mm intervals in axial,coronal and sagittal planes by the CT scanner.Mapped mesh technique was used to obtain the finite element,adian finite element commercial package was used to study the response of the model.The new finite element model is composed of four vertebral segments from C4 to C7 unit,which including four vertebrae(C4-C7),three discs(C4/5,C5/6,C6/7) and five main ligaments.The model consisted of 2178 solid 3 D elements with twenty nodes.All important anatomic features of the cervical spine vertebral artery holes were included in our model.Under a 1 8 Nm segmental movement and force displacement response were observed.Result:The result of the biomechanic study was better corrolated with the available experimental data.Conclusion:The finite element model of cervical spine from C4-C7 shows good response against the experimental data.Which indicates that our model could be used to imitate the biomechanic experiment of cervical spine.