Abstract:

The calcar femorale is a dense bone plate located inside and behind the femoral neck and body junction deep in the lesser trochanter. The calcar femorale forms a complete internal weight bearing system with the stress-resistant trabecula and the stress-resistant trabecula， which is a part of the overall weight bearing system and a supplement and reinforcement of the external weight bearing system. Osteopaedics are familiar with the definition of the calcar femorale， but the calcar femorale is sometimes misunderstood when actually working as a bony plate within cancellous bone on X-ray. The structure of the calcar femorale is often mistaken for primary medial compression battress of the femoral neck. Therefore， through literature review， this article redefined the definition of calcar femorale， further summarized the site and structural characteristics of calcar femorale ， and systematically described its role in the lower neck of femur and lesser trochanter area as well as its position in the weight-bearing system.

Key words: Femur neck, Femur, Anatomy, Hip joint