Fracture of femur

The aim of the study was to calculate the stresses in the femur using 3D FE models in order to draw conclusions about relevant influencing variables in periprosthetic femoral fractures.

For this purpose, calculations were performed with finite element models on bone-implant systems which were then compared with the experimental results.

The calculations were performed on models with patient-specific geometry and patient-specific material parameters (site-dependent according to CT data).

The results show that a good agreement with the fracture tests is achieved. The location and magnitude of the principal normal stresses represent realistic values. Calculations with contact between implant and bone are necessary to ensure realistic force application from the implant to the bone (two-point bearing due to tilting of the implant in the cancellous bed).