The usual treatment for femoral neck fracture is no more than closed reduction hollow nail internal fixation and artificial joint replacement. For young patients, the former is preferred, and patients over 65 years old can consider artificial total hip replacement surgery, which can get down to the ground early and avoid complications of long-term bed rest, such as bed sores, pneumonia, urinary tract infection and other complications, which may lead to death in elderly patients, so to say Hip fracture in the elderly is the last fracture in life, not that no more fractures will occur in the future, but at the end of life, there is no chance to fracture again. Therefore, hip fracture is the death knell of the elderly, which means that the mortality rate of hip fracture in the elderly is very high.DAA is a direct anterolateral hip surgery incision to do artificial total hip replacement, which enters through the muscle gap, without cutting off any muscle of the hip, and keeps the stability of the hip joint. This surgical method can also be used for the artificial total hip replacement of femoral head necrosis. For young patients with femoral head necrosis, they can be discharged from the hospital 2-3 days after the surgery and can go back to work about 2-3 weeks after the surgery, which is definitely a blessing for the working class.