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Mechanical Test and Stability Study of Cervical Fusion Cage

Objective: To evaluate the stability of cervical fusion cage by mechanical test and finite element simulation. Methods: Compression, forward bending, backward extension and lateral bending experiments were performed on the C5-C6 segment of cervical vertebra and fusion cage respectively by universal testing machine and simulation software. The displacement and axial stiffness were calculated under different working conditions, and the correlation was compared. Result: After implantation of the fusion device, the displacement of the experimental test and the finite element simulation decreased, and the axial stiffness increased. Conclusion: The fusion cage designed by using the shape and compressive strength distribution of the endplate can provide good initial stability and meet the mechanical requirements of cervical spine.