人工颈椎间盘置换对下颈椎活动影响的三维有限元分析

建立人工椎间盘置入后下颈椎C_(3~7) 的三维模型,分析颈椎人工椎间盘置换后下颈椎运动情况.根据1例人工椎间盘置入患者术后6个月CT片,应用有限元方法建立其包含Bryan~(TM)人工颈椎间盘假体的下颈椎三维有限元模型,导入Ansys 9.0中,对椎体皮质骨、松质骨、椎间盘用三维十节点四面体结构实体单元进行网格划分后进行分析.对模型加载2 N·m的力矩,观察其在前屈/后伸、侧屈及旋转几种状态下的运动情况,了解其运动特性.通过与以往的研究结果比较,试验结果基本符合或趋势基本一致.结果提示,颈椎间盘置换后能基本保证下颈椎运动稳定性.

Three-dimensional finite element analysis on artificial cervical disc replacement for activities of lower cervical spine

This study was aimed to establish the three-dimensional model of C_(3-7) segment of lower cervical spine after artificial disc implantation, to analyze the movement of lower cervical spine after artificial disc replacement. According to CT films of 1 patient at 6 months after artificial disc implantation, three-dimensional finite element model that included Bryan~(TM) artificial cervical disc prosthesis of the lower cervical spine was established using finite element method, then introduced into Ansys 9.0, the vertebral cortical bone, cancellous bone and intervertebral disc were meshed and analyzed by using under several states such as flexion/extension, lateral bending and rotation, thus understanding their motion characteristics. By comparison with previous research findings, test results nearly accorded with or exhibited identical trend with previous study. The results suggest that, cervical disc replacement can basically guarantee the stability of lower cervical spine movement.