Optimized Model of Lumbar Artificial Disc Using Finite Element Method


Ascribed to the prevalence of low back pain- mostly caused due to disc diseases, and limitations of current treatments, arthroplastic methods have been proposed for replacing the degenerated disc. In view of the fact that the success of this method is highly dependent on the restoration of the mechanical function of the normal disc, it is valuable to study the mechanical performance of the implant after implantation in the spine. For this purpose, modeling the artificial disc and evaluating its performance under similar conditions as in the spine is so crucial. Modeling is done using two computer software; ABAQUS and MATLAB. We validated the model by comparison of its predictions under three loading conditions: compression, bending and torsion, with several sets of experimental data. We determined the optimal mechanical properties of the implant. In conclusion, a well-designed elastic artificial disc preferably has Young modulus of 18.63 MPa and 1.19MPa for annulus and nucleus region, respectively. Such disc can then achieve the goal of restoring the mechanical functions of a normal disc under physiologic loading conditions.

  • Abstract
  • Key Words
  • 1 Introduction
  • 2. Methods and Materials
  • 3 Model Validation
  • 4. Optimization of the Artificial Disc
  • 5. Results
  • 6. Summaries
  • References

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