Hip fracture in the elderly is a common and frequent disease in orthopedic clinics. Although the pain and swelling caused by the fracture itself will be relieved within 1-2 weeks after the injury or traction, the respiratory and urinary system infections, osteoporosis and cardiac, cerebral and pulmonary embolism caused by deep vein thrombosis in the lower extremities due to prolonged bed rest can significantly affect the prognosis of the disease and shorten the life expectancy of the elderly. Surgical internal fixation of intertrochanteric fractures is one of the most common fractures of the hip, and can effectively prevent deformity healing and complications such as decubitus ulcers caused by prolonged bed rest. The two most commonly used surgical procedures for intertrochanteric fractures are closed reduction intramedullary nailing and incisional reduction power hip screw (DHS) internal fixation; in addition, there are artificial femoral head replacement and external fixation frame; however, for unstable intertrochanteric fractures with severe osteoporosis or significant osteoarthritis, whether to consider However, it is still controversial whether to consider hip arthroplasty for unstable intertrochanteric fractures with severe osteoporosis or significant osteoarthritis. Hip arthroplasty for intertrochanteric fractures is difficult to deal with the proximal femur, the operation time is long, and the complications are high, especially whether the elderly patients can tolerate the arthroplasty. At present, domestic and foreign scholars prefer closed reduction + intramedullary nailing for intertrochanteric fractures. Compared with various extra-medullary plate fixation, intramedullary nailing such as proximal femoral intramedullary nail (PFN) or proximal femoral anti-rotation intramedullary nail (PFNA) greatly shortens the lever force arm of the main nail and increases the biomechanical strength of the built-in, which can effectively control the shortening and rotation of the fracture. 1. Patients with intramedullary nail internal fixation can walk with weight on the ground early on the 2nd postoperative day. Reduce the complications of respiratory system, urinary system infection and decubitus ulcer due to bed rest. 2.Simple operation, small trauma and reliable fixation, the patient can successfully restore the preoperative functional status. 3. No blood transfusion is needed during the operation, reducing the complications caused by blood transfusion. 4.Intramedullary nail can be used for almost all types of inter-rotor fractures, especially unstable inter-rotor fractures. 5. Fast fracture healing.