CALCAR FEMORALE
◾The calcar femorale is a dense, vertical plate of bone arising from the cortex under the lesser trochanter in the posteromedial femur and projecting laterally to the greater trochanter.
◾It is thicker medially than laterally and is the site of origin of strong internal trabeculations that support the
weight-bearing dome of the femoral head. The calcar femorale acts to reinforce the posteroinferior femoral neck, and unrecognized comminution of this region may lead to failure of fixation.
◾The weakest bone in the proximal femur lies in the anterosuperior region of the femoral neck and head.
