摘要
目的探讨双侧经寰枢关节螺钉及寰椎椎板钩内固定系统的生物力学性能。方法健康男性志愿者，年龄28岁，身高172cm，体重60kg，X线检查排除枕颈部畸形；对志愿者进行枕骨底到第三颈椎（C0-3）薄层CT扫描，建立具有详细解剖结构的上颈椎（C0-3）有限元模型并验证其有效性。在寰枢椎不稳的上颈椎模型中模拟双侧经寰枢关节螺钉及寰椎椎板钩固定并进行三维有限元对比分析。结果建立了具有详细解剖结构的上颈椎三维非线性有限元模型，整个模型有229047个节点和152475个单元，模型运动范围与体外实验数据相符合，可以用于生物力学实验。双侧经寰枢关节螺钉及寰椎椎板钩内固定系统中螺钉在经过寰枢关节部位时应力最大，有良好的生物力学稳定性。结论双侧经寰枢关节螺钉及寰椎椎板钩固定是一种实用、有效的寰枢椎融合方式。
Objectives To investigate the mechanical properties of bilateral atlantoaxial transarficular screws and arias laminar hooks instrumentation with finite element method. Methods There was a volunteer with age of 28 years old, body height 172 cm, body weight of 60 kg and without cervical deformity by X rays. The ligamentous, nonlinear, three-dimensional finite element models of normal upper cervical spine （C0.3 ） was developed and validated. The destabilized model with bilateral atlantoaxial transarficular screws and atlas laminar hooks was evaluated for quasistatic loading. Results The finite dement model of upper cervical spine consists of 229 047 nodes and 152 475 elements, and correlated well with experimental data for all load cases and could be used for experiment. The finite model with bilateral atlantoaxial transarticular screws and atlaslaminar hooks predicted that the maximum Von Mises Stress was in the region in which screws penetrated the atlantoaxial articular facet. The novel instrumentation resulted in sufficient stability. Conclusion The bilateral atlantoaxial transarticular screws and atlas laminar hooks instrumentation is useful and effective for atlantoaxial arthrodesis.
出处
《中华外科杂志》
CAS
CSCD
北大核心
2008年第9期657-660,共4页
Chinese Journal of Surgery
关键词
颈椎
生物力学
有限元分析
Cervical vertebrae
Biomechanics
Finite element analysis
