枢椎软骨基质融合程度对齿突骨折类型影响的生物力学评估

目的:探讨枢椎软骨基质融合程度对齿突骨折类型的影响。方法:基于正常成人颈椎CT图像建立枢椎精细三维有限元模型。在齿突寰齿关节面上施加前后方向载荷,通过分别降低枢椎松质骨软骨基质融合部位的弹性模量以模拟该部位松质骨不同融合程度,分析枢椎齿突在两种不同约束条件下的应力、应变分布情况,以及枢椎发生骨折的可能类型。结果:两种约束条件下,枢椎有限元计算预测结果发现枢椎软骨基质的融合程度对枢椎高应力集中带分布无明显影响,最大von Mises等效应力值改变亦不明显。结论:枢椎体内软骨基质融合程度对齿突骨折类型无明显影响。

Biomechanical evaluation of the ossification degree of the subdental synchondrosis on fracture type of the dens

Objective:Toexploretheinfluenceoftheossificationdegreeofthesubdentalsynchondrosison the fracture type of the dens. Methods: Detailed three-dimensional finite element model of the axis was reconstructed based on a normal adult volunteer's upper cervical spine continuous lamellar spiral CT images. By altering the trabecular bone's Yong's module of the cartilage matrix ossification region, anterior-posterior direction shearing force was applied on the anterior articular surface of dens under tow boundary conditions and theoretical stress distribution of the axis was calculated to explore the stress distributions and predicted the possible fracture types. Results: Under the two boundary conditions, finite element analysis results demonstrated that the ossification degree of the subdental synchondrosis did not obviously influence the high stress distributions, as well the maxium von Mises equivalent stress. Conclusions: The ossification degree of the subdental synchondrosis has no relationship with the fracture type of dens.