摘要
[目的]运用有限元方法评价寰枢椎经关节螺钉联合椎板钩内固定和寰枢椎椎弓根螺钉内固定生物力学稳定性和安全性。[方法]运用有限元软件建立寰枢椎经关节螺钉联合椎板钩和寰枢椎椎弓根螺钉两种内固定系统的有限元模型,并加载到寰枢椎不稳的有限元模型上,进行计算和分析,得出各个有限元模型的活动度(ROM),并提取内固定有限元模型的应力云图。[结果]寰枢椎经关节螺钉联合椎板钩内固定的活动度要略小于寰枢椎椎弓根螺钉内固定。在屈和伸的工况下,寰枢椎经关节螺钉联合椎板钩内固定产生应力值较大,主要集中在螺钉根部和经关节部位;在后伸工况下,寰枢椎椎弓根螺钉内固定产生应力较大,主要集中在螺钉的根部和连接棒。[结论]寰枢椎经关节螺钉联合椎板钩内固定的稳定性略好于寰枢椎椎弓根螺钉内固定。寰枢椎经关节螺钉联合椎板钩内固定在螺钉经关节部位和螺钉根部易产生断钉,而寰枢椎椎弓根螺钉内固定在螺钉根部和连接棒处易产生断钉。
[Objective] To evaluate biomechanical stability and security of C_（1、2） transarticular screw with C_1 laminar hook fixation and atlantoaxial pedicle screw fixation by finite element method. [Methods] The finite element model of C_（1、2） transarticular screw with C_1 laminar hook fixation and atlantoaxial pedicle screw fixation were developed,and loaded on finite element model of atlantoaxial instability. The range of motion were measured and analyzed. Stress cloud of internal instrument were got in each model. [Results] The ROM of atlantoaxial pedicle screw fixation was a little larger than that of C_（1、2） transarticular screw with C_1 laminar hook fixation. C_（1、2） transarticular screw with C_1 laminar hook fixation had maximum stress on the root and transarticular part of the screw. Atlantoaxial pedicle screw fixation had maximum stress on the root of pedicle screw and connecting rod under extension position. [Conclusion] C_（1、2） transarticular screw with C_1 laminar hook fixation is more stable than atlantoaxial pedicle screw fixation. Screw breakage easily occurs on the root and transarticular part of the screw in C_（1、2） transarticular screw with C_1 laminar hook fixation,while on the root of pedicle screw and connecting rod in atlantoaxial pedicle screw fixation.
出处
《中国矫形外科杂志》
CAS
CSCD
北大核心
2016年第13期1217-1222,共6页
Orthopedic Journal of China
基金
国家自然基金青年项目(编号:81301602)
福建省科技计划项目(编号:2015Y5006)
福建省自然科学基金资助项目(编号:2016J01581)
关键词
寰枢椎不稳
内固定
有限元
生物力学
atlantoaxial instability
internal instrument
finite element
biomechanics
