If necrosis does not occur about 1 to 2 years after femoral neck fracture surgery, then recurrence of femoral head necrosis in the short term can be basically ruled out. Surgical treatment of femoral neck fracture is usually closed reduction hollow nail internal fixation (head preserving treatment), or hip arthroplasty. Ischemic necrosis of the femoral head is a complication of closed reduction hollow nail internal fixation. If necrosis of the femoral head does not occur for about 2 years after surgery, necrosis of the femoral head in the short term can be basically excluded. Generally speaking, bed rest is required for about 2~3 months after surgery. Femoral neck fracture is very easy to damage the blood supply of the femoral head leading to necrosis of the femoral head, 1~2 years if there is no necrosis shows that the blood supply of the femoral head is basically restored, so necrosis can be ruled out. However, it does not mean that necrosis will never occur. If necrosis of the femoral head occurs again after many years, hip replacement can be performed.