| 张 凯,刘新宇,黄晓慧,汪 耀,田永昊.寰椎侧块-枢椎椎板螺钉固定的有限元分析[J].中国脊柱脊髓杂志,2011,(2):125-128. |
| 寰椎侧块-枢椎椎板螺钉固定的有限元分析 |
| 中文关键词: 枢椎 椎板 有限元 生物力学 |
| 中文摘要: |
| 【摘要】 目的：建立寰椎侧块-枢椎椎板螺钉固定的三维有限元模型并进行有限元分析，探讨其生物力学特性。方法：通过CT扫描获取1例健康成年男性寰枢椎图像信息，应用VTK软件及ABAQUS软件构建寰椎侧块-枢椎椎板螺钉固定的三维有限元模型，观察中立、前屈/后伸、侧弯、旋转、前后平移等载荷下固定系统的应力变化，分析寰枢侧块-枢椎椎板螺钉固定系统的生物力学特性。结果：所建立的有限元模型逼真地描绘了寰椎侧块-枢椎椎板螺钉固定系统的结构特点，共包含183363个节点（椎骨130982个，螺钉52381个），116082个单元（椎骨83776个，螺钉32306个）。在不同运动状态下，螺钉应力分布主要集中在螺钉置入骨质部分的根部周围和钉棒连接处。前屈载荷时，连接棒从头端至尾端的应力逐步减小，在寰椎侧块螺钉的钉棒连接处应力最大；其他载荷下连接棒应力分布从头端至尾端逐步增大，至枢椎椎板螺钉的钉棒连接处达到最大。后伸和旋转载荷下，螺钉存在明显的高应力区，各螺钉的应力最大值大于其他运动状态。结论：寰椎侧块-枢椎椎板螺钉固定系统固定时各螺钉在颈椎旋转及后伸时所受应力明显增加，术后应避免颈椎过度旋转及后伸，以减少螺钉松动和断裂的发生。 |
A finite element model of C1 lateral mass-C2 intralaminar screw-rod fixation and its biomechanical analysis |
| 英文关键词:Axis Lamina Finite element analysis Biomechanics |
| 英文摘要: |
| 【Abstract】 Objective：To establish an anatomic detailed finite element model of C1-C2 complex and investigate the biomechanical features of intralaminar C2 screws.Method：The coordinate data of the cervical vertebrae were obtained from the CT scan images of a healthy Chinese male adult volunteer.Visualization Toolkit（VTK） software was used to preprocess and establish the geometry model of the C1-C2 cervical spine.The geometry model was meshed by ABAQUS software.Some material parameters were defined from other available material parameters by using proportion and function scale method.The changes of theoretical stress in different positions of atlas were analyzed when the skull was in neutral position，flexion/extension，right and left lateral bending，axial rotation and anterior-posterior（AP） translation.Result：The model of C1-C2 complex consisted of 183363 nodes and 116082 elements.The data indicated that C1 lateral mass-C2 intralaminar screw-rod fixation significantly reduced the C1-C2 motion in flexion/extension，lateral bending and axial rotation compared to the intact cases.The results showed that there was concentration of stress at the upper bone-screw interface and the inferior transition area between rod and screw in extension.Stress concentration in flexion occurred in both the upper rod-screw transition area and bone-screw interface. In rotation the inferior conjunction of screw-rod presented stress convergence，the stress of the screw system was well-distributed.Conclusion：The finite element model of the atlantoaxial spine realistically simulates the atlantoaxial motion，which can simulate the natural condition and facilitate the further biomechanical research. |
| 投稿时间：2010-10-25 修订日期：2010-12-10 |
| DOI：10.3969/j.issn.1004-406X.2011.2.125.3 |
| 基金项目: |
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