A three-dimensional finite element model (FEM) of the L3-L4 motion segment using ABAQUS v 6.9 has been
developed. The model took into account the material nonlinearities and is imposed different loading conditions. In this
study, we validated the model by comparison of its predictions with several sets of experimental data. Disc deformation
under compression and segmental rotational motions under moment loads for the normal disc model agreed well with the
corresponding in vivo studies. By linking ABAQUS with MATLAB 2010.a, we determined the optimal Young s
modulus as well as the Poisson's ratio for the artificial disc under different physiologic loading conditions. The results of
the present study confirmed that a well-designed elastic arthroplastic disc preferably has an annulus modulus of 19.1
MPa and 1.24 MPa for nucleus section and Poisson ratio of 0.41 and 0.47 respectively. Elastic artificial disc with such
properties can then achieve the goal of restoring the disc height and mechanical function of intact disc under different
loading conditions and so can reduce low back pain which is mostly caused due to disc degeneration.
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