基于CT数据的枕寰枢复合体三维非线性有限元模型的建立和验证

Development and analysis of three-dimensional finite element model of occipito-atlantoaxial complex based on CT data

目的建立验证有效的枕寰枢复合体三维非线性有限元模型。方法将枕寰枢复合体CT数据导入有限元建模软件,加载韧带和材料属性,构建枕寰枢复合体三维非线性有限元模型,并进行分析计算,将活动度(ROM)的数据与体外实验结果和已发表的有限元模型结果进行比较。结果本研究构建的枕寰枢复合体三维非线性有限元模型几何相似性好,共包含206 747单元,72 500个节点,与Panjabi测量的体外实验结果和Brolin及Zhang等建立的有限模型结果基本相吻合。结论建立的枕寰枢复合体三维非线性有限元模型真实有效,可以用于生物力学研究。

Objective To establish and validate a three-dimensional finite element model of occipito-atlantoaxial complex.Methods The occipito-atlantoaxial complex CT data were established, and imported into the finite element modeling software. The ligament and the material properties were loaded. The three-dimensional nonlinear finite element model of occipito-atlantoaxial complex was constructed, analyzed and calculated. The calculation results of the activity（ROM） and in vitro experiments were compared with published results of finite element model. Results Three dimensional nonlinear finite element model of the occipito-atlantoaxial complex geometry had good similarity, consisted of 206 747 elements, 72 500 nodes. The results of the finite model and experimental results conformed with Panjabi in vitro measurements and the finite models of Brolin and Zhang. Conclusion The finite elementmodel of occipito-atlantoaxial complex realistically simulates the complex kinematics of the craniocervical region which cansimulate the natural condition and facilitate the further biomechanical research.