The Design Of Non-fusion Technology Of Artificial Vertebral Body And Finite Element Modeling And Analysis

Although spinal fusion can rebuild spinal stability, However, it has the risk ofpostoperative complications.The main reason is the spinal biomechanics have been changedwhich has lead to degeneration of adjacent intervertebral disc and the surrounding tissue.In recent years, with the deepening understanding of the spinal biomechanics mechanismand the development of material science, spinal non-fusion has become a new methods totreat lumbar degeneration disease caused by spinal fusion.At home and abroad, the artificial lumbar fusion technology has been used in the clinicalwidely and the effect in the recovery of the stability of the spine and kinematicscharacteristics curative is distinct. But the research of after the artificial disc replacement ofbiomechanics is imperfect. Therefore,using suitable material and designing reasonablestructure of the artificial disc device is very important. This topic put forward a new structureof artificial vertebral body and intervertebral disc. Through the finite element softwareanalysis the stress and strain of the displacement model in the movement state, as to providetheoretical basis for the clinical application and at the same time provide parameter basis forfurther design.Objective: establish the finite element replacement model of the new artificial vertebralbody and intervertebral disc and analyse its stress and strain.Methods: determine the structure of the prosthesis design, The spiral CT scanningtechnology and reverse engineering method is used in combination and establish finiteelement model of lumbar vertebral body and intervertebral disc replacement. Taking staticsanalysis which contain single motions (positive pressure, bending forward, lateral bendingand torsion) and complex motions and study the stress and strain distribution.Results: Successfully established finite element replacement models of artificialvertebral body and intervertebral disc. In the condition of each movement, the large stress andlarge deformation of the part of silica gel disc are consistent and deviation to the side of theforce which is consistent with the normal spinal motion. In single reverse movement state, thedeformation of silica gel disc is larger than other single movement states which is consistentwith the speculation that the reverse is one of the major causes of intervertebral disc disease.In complex movement state, the deformation of silica gel plate is larger than the single.Inpositive pressure-reverse, silica gel disc’s maximum stress is2.14MPa, the maximaldisplacement is2.344mm.Conclusion: Establishment of finite element models of artificial vertebral body andintervertebral disc are feasible. The analysis results are reliable.To sum up, the deformation of silica gel disc is close to the normal physiological discfunctions, so this study can be further provide theoretical basis for the experimental study andclinical application.