Multi-vertebrae finite element models: the effect of the discs’ constitutive modelling on vertebrae deformation
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Vertebral fractures cannot currently be accurately predicted in clinics, where the adopted scores have limitations in identifying subjects at risk. In this context, computed tomography (CT)-based finite element (FE) models might improve fracture risk prediction. Many proposed FE models consider single vertebrae only, thereby neglecting the role of the intervertebral discs in load transmission and distribution across vertebrae. Multi-vertebrae models would allow the inclusion of more physiological boundary conditions in the simulation thanks to the discs' inclusion. Nevertheless, while CT allows material properties to be assigned to the vertebrae according to the Hounsfield Units, no information about the discs' mechanical properties is provided. The aim of this study was to compare how different constitutive modelling for the discs’ nucleus pulposus and anulus fibrosus affected the strains at the vertebral level.
