Three-dimensional finite element analysis on three-dimensional stability of improved artificial atlanto-odontoid joint

Abstract

Objective To evaluate three-dimensional stability of improved artificial atlanto-odontoid joint by finite element method.Methods The finite element model was constructed by the software Mimics with CT images.According to the clinical practice,atlas was dealt with and artificial atlanto-odontoid joint was assembled.The meshed model was acquired and imported to software Ansys to analyze three-dimensional stability of the model.Results The displacement of artificial atlanto-odontoid joint under flexion,extension,lateral flexion load was 1.109,3.310,0.528 mm respectively.The displacement was 9.678 mm under rotation load.The range of motion was 1.6°,5.1°,4.6° and 22.0° respectively by further calculation.Conclusion Improved artificial atlanto-odontoid joint arthroplasty can basically restore excellent stability and reserve the movement of atlanto-axial joint instantly after operation. Key words: Biomechanics ; Atlanto-odontoid joint; Arthroplasty