Whether or not you can walk after 30 years of necrosis of the femoral head needs to be decided on a patient-by-patient basis. Depends on the development of the disease and treatment. If the necrosis of the femoral head has been 30 years, the patient’s condition after treatment is still stable in stage Ⅰ or stage Ⅱ can walk on crutches. If the development of stage 4, you should seek medical advice and choose hip replacement surgery, after surgery can resume walking. Stage I necrosis of the femoral head is what we usually call the early stage of necrosis of the femoral head, which cannot be detected by X-ray. Stage II necrosis of the femoral head will have abnormalities on X-ray film, which is characterized by mottled sclerosis of the femoral head and the formation of empty capsule. No femoral head collapse is symbolized in this stage either by X-ray or CT film, and there is no acetabular change, but the femoral head injury is enlarged in the affected area. CT films of stage III femoral head necrosis showed cystic cavities, osteosclerosis, and cartilage fracture.MRI images showed multilevel bone and cartilage fracture. The area of injury in the affected part of the femoral head remained medial, central and lateral. Stage III femoral head necrosis class A has a femoral head collapse of less than 2 to 4 millimeters. Stage IV femoral head necrosis is what we call the end stage of femoral head necrosis, in this stage X-ray shows flattening of the joint surface and narrowing of the joint space. For patients who have had osteonecrosis of the femoral head for 30 years, it is necessary to confirm the degree of necrosis of the femoral head with the help of a doctor to decide whether they should walk on the ground or use crutches to assist walking.