枕寰枢关节三维有限元模型的建立及其有效性验证

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Abstract Objective To construct a three-dimensional nonlinear finite element model of the occipital，atlas，and the axis and verify the validity of the model.Methods Thin layer CT scan were conducted for one male volunteer，scanning data were directly read by Mimics 15.0 software，the three-dimensional geometric model of atlas，axis，and part of the occipital bone were established，then the model was imported into the finite element re-processing software HyperMesh 10.0，by which we add all the ligaments and joint capsulars，meshing all the structures of the model，define the material parameters of all bone structures and soft tissues.Finally，we generated a comprehensive three-dimensional finite element model of occipito-atlantoaxial complex，which was recognizable in the software “ABAQUS”.With "ABAQUS" software，we made the model producing flexion，extension，lateral bending，rotatory motion under torsion at 1.50 N·m，computed torque-angular displacement，and compared the values with the reference value of Panjabi’s.Results This study established a normal finite element model of occipito-atlantoaxial complex，including a total of 513601 mesh elements.When the applied load reaches 1.53 N·m，the range of motion of our model was within the range of 95% reference value in Panjabi’s study.And all six load torque-rotation angle curves showed obvious nonlinear relationship. The atlantodental interval was 1.22 mm in the neutral position，under the shearing force forward，the ADI were up to 2.8 mm without the failure of the model，which was also consistent with cadaveric experiments.Conclusion The occipito-atlantoaxial complex finite element model developed in this study has highly realistic geometric configuration，two-dimensional membrane element optimized the realistic of the appearance of the model，and we can accurately analyze the strain and stress distribution in different ligaments under different motion state of atlantoaxial joint.Through the validation under certain loads，our model has significant nonlinear kinematic characteristics，to some extent，in line with the character of real body.

Key words： occipito-atlantoaxial complex three-dimensional finite element nonlinear validation

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http://www.sygkzz.com/EN/ OR http://www.sygkzz.com/EN/Y2018/V24/I5/427

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