The Reconstruction Of α C₁-C₃ Cervical Model And α Study Of Different Fusion Method InThree-dimensional Nonlinear Finite Method

Objective: (1) To establish a C1-C3 cervical model of a normal human being based on three-dimensional nonlinear finite method for further biomechanical analysis and verificate the effectivity of the model. (2) To investigate the stress distributions of C₁-C₃ in different position and different load. (3) To investigate the change of the stress distributions of C₁-C₂ fused with two different approaches and investigate the stress distributions of the segment adjacent to fused FSU.Material and Method: In the investigation, a detailed C₁-C₃ finite element model of a 29 years old healthy man was established in three-dimensional nonlinear finite method with the aid of two software CATIAV5 and MSC.Marc/MSC.Mentant based on CT lamellar scan films. In contrast to the behaviors of the cadaver cervical vertebrae, the model was validated effective. Based on the normal model, the destabilized fractured and fused with two different approaches C₁-C₂ model was established. After different loadings were employed on these models, we recorded the scattergrams of stress, angular displacement of the fusion segments and the Von Mises stress of adjacent structure.Results:(1) A detailed finite element model of C₁-C₃ was established and validated. (2) There is not visible difference of the stability between two different fused approaches. (3)The change of adjacent structure biomechanicalcircumstance in Brooks method is smaller than in ante-approach of atlantoaxisfuse method, but the fused bone block was always in a tension circumstance. Thebone block was in a stress circumstance in anterior approach of atlantoaxis fusemethod besides the position of lateral flexion.Conclusions: (1) The nonlinear finite elements C1-C3 model of a 29 years oldhealthy man was constructed and validated. (2) There is not visible difference ofthe stability between two different fused approaches. (3)Because of the easier ofthe operation expose, the little of the wound and the little chance of cataplasia inadjacent construction, the Brooks method is our first choose in atlantoaxis fuseoperation.