Nonlinear quasi-static finite element simulations predict in vitro strength of human proximal femora assessed in a dynamic sideways fall setup

作者：Varga Peter^*; Schwiedrzik Jakob; Zysset Philippe K; Fliri Hofmann Ladina; Widmer Daniel; Gueorguiev Boyko; Blauth Michael; Windolf Markus

来源：Journal of the Mechanical Behavior of Biomedical Materials, 2016, 57: 116-127.

DOI：10.1016/j.jmbbm.2015.11.026

• Proximal femur fracture
• Drop tower test
• Finite element analysis
• Quasi-static model
• Fracture pattern

Osteoporotic proximal femur fractures are caused by low energy trauma, typically when falling on the hip from standing height. Finite element simulations, widely used to predict the fracture load of femora in fall, usually include neither mass-related inertial effects, nor the viscous part of bone's material behavior. The aim of this study was to elucidate if quasi-static non-linear homogenized finite element analyses can predict in vitro mechanical properties of proximal femora assessed in dynamic drop tower experiments. The case specific numerical models of 13 femora predicted the strength (R-2=0.84, SEE=540 N, 16.2%), stiffness (R-2=0.82, SEE=233 N/mm, 18.0%) and fracture energy (R-2=0.72, SEE=3.85 J, 39.6%); and provided fair qualitative matches with the fracture patterns. The influence of material anisotropy was negligible for all predictions. These results suggest that quasi static homogenized finite element analysis may be used to predict mechanical properties of proximal femora in the dynamic sideways fall situation.

• 出版日期2016-4