The Three-dimensional Finite Element Analysis Of Anterior Different Fusion In Lower Cervical Vertebra

Objective: To develop a three- dimensional finite element model of the C4-C6 to evaluate the load,stress of interface and biomechanics distribution of C5 fused with two different fusions (cervical vertebrae a anterior titanium plate and bone block; cervical vertebrae anterior titanium plate and titanium cage).Method: The C5 motion segment data were obtained from CT scans (at 1mm width increments) of the 54-year -old-man. After these images were processed , a three-dimensional finite element model of the C4-C6 was established by Mimics 10.01. Meanwhile, the three-dimensional finite element model of cervical vertebrae anterior titanium plate and bone block and titanium cage were established by Ansys 10.0. According to the above mentioned, two different fusion model of fusion bone block and titanium cage combineed with an anterior titanium plate system were prepared by adding bone block, titanium cage on the basis of surgery approaches respectively. Loads used in this study were axial compressive, flexion, extension, lateral bending and rotation forces. After the loadings were placed on all the models, the angular motions and the distribution of Von Mises stress of the fused segment were analyzed and compared.Results: The condition of compression is conducted nearly by titanium cage/ bone block. The condition of extend and flexion is conducted almostly by screws. Crews obtain the greatest shear force in the condition of rotation. The interface of titanium cage-lamina terminalis concentrate stress. The stability of two different fusions is corresp.Conclusion: The load is different in different condition. Two different fusions satisfy the need of operation, but the titanium cage concentrate stress.