Fig. 1.

(A) The femoral neck is well developed in Homo sapiens, with a global orientation slanting upwards and forwards. (B) The proximal femur presents a complex three-dimensional architecture. The cortical bone presents an asymmetric cross-sectional distribution along the femoral neck: a thick cortex is observed in the inferior part, while the cortex in the superior part is thin. The trabecular bone is organised along three major trabecular systems – medial, trochanteric and arcuate – surrounding an area of less resistance named Ward's triangle.