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This paper presents a bone structural analysis of a reconstructed fractured femur assigning inhomogeneous isotropic material properties accessed from CT images into the FE model. The grayscale values accessed from CT images were converted into local Young modulus that was assigned to the associated finite element of the mesh. The FE model was obtained from CT images by a numerical reconstruction of a proximal femur which presents an atypical fracture in the sub-trochanteric region with full displacement and no continuity between the fragments. The reconstruction involved procedures such as volume reconstruction from images, segmentation by thresholding, labeling of the connected components and also the alignment of point clouds data using the Iterative Closest Point (ICP) algorithm. The resulted aligned point cloud was thus converted into a solid and finally in a finite element mesh, that was analyzed in a standard FE framework. Another FE model with constant elastic modulus for cortical and trabecular bone was also simulated to compare results with our model. The values of principal stress and strains were rather closer to tensile values but for compressive values there were obtained significant differences between the two models, indicating that inhomogeneous model captures better the mechanical behavior for compression. Results obtained are in accordance with expected bone biomechanics behavior. The assignment of inhomogeneous material properties into the FE model become the structural analyzes more realistic and this research highlight that this assignment is fundamental for reliable subjectspecific models. The procedure implemented for reconstruction of fractured bones using CT images offers new insights to analyze the bone fractures since allows recovering the material state immediately before the failure.

FE BONE STRUCTURAL ANALYSIS WITH CT MAPPING OF INHOMOGENEOUS MATERIAL PROPERTIES