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Finite Element Analysis on Vertebral Stress Distributions And Pressure Variations of Facet Joint Following PrestigeTM-LP Artificial Disc Replacement
Author(s): 
Pages: 4311-4315
Year: Issue:  4
Journal: Chinese Journal of Medical Physics

Keyword:  Artificial discfinite element model(FEM)stresscervical spine;
Abstract: Objetcive: To analyse on vertebral stress distributions and pressure variations of facet joint.To better understand the load transfer pattern and mechanical effect following artificial disc replacement.Methods: The FEM of C4~C5 following PrestigeTM-LP artificial disc replacement was established by transferring the CT date to finite element modeling software.Analysis on C5 vertebral stress and C4~C5 facet joint pressure were conducted under normal physiologic loads in flexion,extension,left lateral bending and left axial rotation.Results: Motion loads induces C5 vertebral stress increase and stress distributions present displacement conformed with motion direction.Facet joint pressure increases obviously on extension more than flexion.Left facet joint pressure increases obviously on left lateral bending and right facet joint pressure increases obviously on left axial rotation respectively.Conclusions: The FEM possesses a high precision and visual image on stress analysis of skelecton structure.PrestigeTM-LP artificial disc prosthesis well preserves intervertebral stress transfer and contact pressures in facet joint,possesses biomechanical character near normal cervical spine.
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