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Influence of the velocity on the in vitro fracture of the femoral neck for lateral compression tests

Fracture of the proximal femur is the most serious consequence of osteoporosis, and has now become an important public-health problem (Dreux and Delmas 2001). This skeletal disease reduces the density and the quality of bones, weakening their strength and producing really fragile bones. In vitro experiments provide information on geometrical and mechanical data in relation with the femoral strength. Two types of boundary conditions are described in the literature (Ford et al. 1996; Sabick and Goel 1997; Keyak et al. 2001;Cristofolini et al. 2007): (i) themonopodal configuration used to simulate spontaneous fractures of the proximal human femur under the own weight of a patient or (ii) the lateral configuration used to simulate a fall. However, most of the literature tests have been conducted in quasi-static configuration,while inertial effects could play an important role. The aim of this study was to design a test device for femur strength characterisation in lateral configuration and to compare the fracture behaviour with the quasi-static tests.