Fracture of the femur is a serious injury because the femur is an important bone that connects the body to the lower extremities, including the hip and knee joints are composed of the femur, so femur injury has a great impact on the lower extremities, and if the recovery is not good, it can seriously affect the function of the lower extremities. In addition, fractures of the femur, such as femoral stem fractures, can cause damage to the femoral artery due to heavy bleeding, resulting in hemorrhagic shock, which can be serious and life-threatening. If a fracture of the femoral neck causes non-union or distal femoral head necrosis, it can also seriously affect the function of the lower extremity. If the distal femur fracture involves the fracture of the internal and external condyles of the knee, it can also cause abnormal knee function and produce pain during knee movement or traumatic arthritis, which can also seriously affect the function of the lower extremity. Therefore, no matter where the femur fracture occurs, the damage is more serious and must be treated systematically and formally in a hospital.