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FEMUR MECHANICAL SIMULATION USING HIGH-ORDER FE ANALYSIS WITH CONTINUOUS MECHANICAL PROPERTIES

Femur 3D finite-element (FE) analysis based on CT data requires both accurate geometry representation and mechanical properties assignment. A ”structure based” method is suggested for the reconstruction of a FE model so that the geometry is represented by smooth surfaces extracted from the CT data including a separating surface between cortical and trabecular regions. Then, p-FE auto-mesh is generated. Within each region (cortical or trabecular) the heterogeneous density is described by continuous spatial functions that are generated using Least Mean Square (LMS) approximations based on the CT scan data. Finally the Young modulus is evaluated continuously according to the functional representation of the density. Numerical investigation shows good results of the suggested method compared to voxel-based method. Mechanical in-vitro experiments on fresh frozen femur measuring head deflection and strains at several points is currently used for FE model calibration and validation. The presented study is a first step towards a p-FEM simulation of human femurs based on CT data in order to optimize a protocol for cervical fracture surgery fixation.