Constituive modelling of the annulus fibrosus: Numerical implementation and numerical analysis

The biomechanics of the intervertebral discs is of an enormous complexity, on a large extent due to the huge anatomical complexity of the annulus fibrosus (AF). The present work aims to contribute to the development of a new constitutive modeling of the AF, by taking into account the circumferential evolution of fibers´ angles, from AF ventral to dorsal regions, and the evolutionary mechanical properties of the AF fibers, both circumferentially and radially. The FE implementation and numerical simulations are being carried out on a home-developed FE solver. The preliminary results of a compressive load of the IVD seem to be in a very good agreement with the publish ones, both in terms of compressive force and intradiscal pressure.