This book studies the importance of calcar femorale in proximal femur fractures, its importance in the biomechanics of hip, and the need of calcar reconstruction in proximal femur fractures. This book shows the types of reconstruction and use of different implants for calcar reconstruction. The author of the book introduces a newer technique in calcar reconstruction in proximal femur fracture with the use of the head and neck of femur in hemiarthoplasty or total hip arthroplasty.