The topographic and comparative study of the calcar femorale.

The absence of compact bone of the type of calcar femorale in the femoral bones of other species may suggest a relationship between the calcar and the type of locomotion, the position of the femur in the hip joint, and the value of load carried by the femur. The presence of calcar femorale may be observed during routine radiological examination of the femur in lateral (or axial) projection. The absence of calcar shadow on X-ray examination is not ruling out its presence in the femur.