不同材料固定寰枢椎脱位在扭转状态下有限元分析

Three-dimensional Finite Element Analysis of Magnesium Alloy and Titanium Alloy TARP System in the Treatment of Atlantoaxial Dislocation:a Comparison of Anti-Torsion Properties

应用三维有限元分析法对前路寰枢椎脱位的患者,使用镁合金与钛合金材料TARP钢板固定,进行抗扭转特性对比分析,为临床提供理论依据。选择一例寰枢椎骨折脱位患者,进行CT薄层扫描,将Dicom数据导入计算机进行三维重建和有限元分析,对结果进行统计学分析。结果表明上颈椎的有限元模型外形逼真,几何相似性好,共包含65873个节点,201875个单元,应力集中区域为关节应力集中区域分别为颈2/3关节突关节,其次是寰椎前弓、后弓和侧块;再次为颈2椎弓,镁合金和钛合金固定材料有显著性差异(P<0.05)。因此,应用CT扫描获取上颈椎空间结构信息建立的上颈椎模型可用于生物力学实验,镁合金材料比钛合金材料临床固定效果更好,值得在临床进一步推广应用。

To discuss the application different of materials transoralpharyngeal atlantoaxial reduction plate （TARP） in the treatment of unreducible atlantoaxial dislocation by using finite element analysis methods, and to provide theoretical support for its clinical application. A typical example of atlantoaxial fracture dislocation patients, and CT thin titanium alloy and the clinical application of TARP system scan, and access to DICOM image data, import three-dimensional finite element analysis software, were simulated using the two kinds of titanium and magnesium alloydifferent materials preparation TARP reduction and internal fixation, The results were statistically analyzed. Built in the shape of atlantoaxial dislocation reduction and internal fixation of the finite element model realistic, geometric similarity, a total of 65873nodes, 201875 units; in the simulated head is located immediately, the stress concentration region were neck2/3 of the facet joints, followed by the anterior arch of atlas posterior arch and lateral mass; again arch of the neck 2, the two different materials of magnesium alloy and titanium alloy preparation of TARP system, the distribution of the corresponding mechanicalthere are significant differences （P 〈0.05）. CT scan was established to obtain structural information in atlantoaxial model can be used for biomechanical experiments; The use of existing titanium TAtLP treatment of atlantoaxial dislocation, and maintain the anterior arch of atlas,arch is complete, and fusion of the lateral mass indeed, you can better maintain the stability of atlantoaxial; aflantoaxial fusion, the facet joints of adjacent segments increased the force to accelerate the degeneration, should be closely followed up; The magnesium alloy materials for preparation of the TARP system better than titanium TARP in the stress concentration region lower and peak stress distribution improved, needs further study.