Physiological load bearing support
The anatomy of the femoral neck and the aspect of the force lines in the calcar region demonstrate an extremely resistant structure with an elevated load bearing capacity. Moreover, thanks to the angled position of the femoral neck, its preservation stabilizes the stem thus avoiding torsion movements .
 Tobin WJ (1955): The internal architecture of thefemur and its clinica/ significance. J Bone Joing Surg Am 37:41-57 .