寰椎后路椎弓根螺钉及侧块螺钉的生物力学分析  

Biomechanical analysis of the posterior pedicle screw and the lateral mass screw on the atlas

作　　者：张昊[1] 白净[1] 谭明生[2] 移平[2] 

机构地区：[1]清华大学生物医学工程系,北京100084 [2]中日友好医院骨科,北京100029

出　　处：《清华大学学报（自然科学版）》2008年第3期419-422,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(30670577,60571013,60331010);国家“九七三”重点基础研究资助项目(2006CB705700);国家教育部博士点基金项目(20050003090);清华-裕元基金项目

摘　　要：后路螺钉固定技术已逐渐成为后路寰枢融合的主流。为进行相关的生物力学研究,该文基于可视人数据库建立了寰椎后路椎弓根螺钉和侧块螺钉固定的有限元模型,并对2种固定方法在不同钉道长度下,骨-钉界面的生物力学特性进行了模拟和分析。结果显示,随钉道长度的缩短,2种方法在骨-钉界面处的皮质骨和松质骨的最大von M ises应力及最大等效应变均逐渐增大。由于椎弓根方法具有长皮质骨钉道,因而可以比侧块方法为寰椎后路的螺钉固定提供更高的稳定性。该研究为后路螺钉固定技术的生物力学评价以及临床应用提供了依据。Posterior screw fixation is commonly used for posterior fusion of atlantoaxial complexes. However, there are few biomechanics studies of the technique. Finite element （FE） models of screw fixation into the atlas via the posterior arch and the lateral mass were used to simulate and investigate the biomechanical properties of the interface between the screw and the vertebra for various screw lengths and vertebral strengths. As the screw length decreases, the maximum yon Mises stress and the maximum equivalent strain at the interfaces increase for both methods. Because of the longer cortical screw path, transpedi cular screw fixation in the atlas gives a better stability than lateral mass screw fixation. The current FE model provides useful for biomechanical studies and clinical application of the posterior screw fixation technique.

关 键 词：寰椎 有限元模型 螺钉固定 椎弓根 侧块 

分 类 号：R318.01[医药卫生—生物医学工程]