Prediction of proximal femoral fracture by using Quasi-brittle damage with anisotropic behaviour model

Awad Bettamer (1) , Ridha Hambli (1) , Abdelwahed Berkaoui (1) , Samir Allaoui (1)

1 F2ME

A femoral fracture caused by the osteoporosis becomes increasingly important goal for both clinicians and biomedical researchers in order to evaluate and to prevent the risk of neck femur fracture. Over the last years, a large number of 3D FE models based on quantitative computed tomography (QCT) which can account for the three-dimensional proximal femur and bone density distribution have been developed to predict proximal femur fractures. Most previously published models employed simple uncoupled failure criteria to linear and non-linear with isotropic and anisotropic material behaviour. The authors focused their attention on the failure initialization stage, and not on the prediction of failure propagation. The purpose of this study was to develop a computed tomographic (CT) 3-D anisotropic model based on isotropic damage to simulate the force-displacement curve and to profile the fractured area of proximal femur. The model was developed in term of anisotropic coupled behaviour law (strain-quasi-brittle damage) to describe the progressive crack initiation and propagation within proximal femoral. To illustrate the potential of the current approach, the right adult human femur previously investigated by Keyak et al. , (Model B: male, age 61) was simulated till complete fracture under one-legged stance load. The femur fracture profile was predicted and compared to similar clinical observed results. Good agreements were obtained and different fracture patterns were predicted. The obtained results show that the proposed damage model could be used correctly to simulate the fracture type.

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Biomécanique [physics.med-ph]; Biomécanique [physics.med-ph]

Awad Bettamer, Ridha Hambli, Abdelwahed Berkaoui, Samir Allaoui. Prediction of proximal femoral fracture by using Quasi-brittle damage with anisotropic behaviour model. 2nd International Conference on Material Modelling, Aug 2011, PARIS, France. pp.ID269. ⟨hal-00772663⟩