1. Early symptoms include: low back pain, pain in the affected hip, pain in the affected groin, pain in the knee joint of the affected limb, coldness in the affected limb, weakness when moving around, soreness, and easy fatigue. These symptoms do not appear at the same time. Some people have one or two symptoms or several symptoms, which disappear after a short period of time, repeatedly. This is the early symptom of femoral head necrosis, which can be detected by CT, ECT or MRI. X-rays are not capable of early diagnosis. When there are changes in X-rays, the disease has already reached the middle and late stage, and it is a little late for treatment. Because early X-rays of femoral head necrosis can only show reduced blood circulation around the femoral head, osteoporosis, and a few cystic changes. Therefore, X-rays alone generally cannot detect the disease at an early stage. And at this time because of the femoral head pressure increase, the affected limb parts of the pain is more obvious, often misdiagnosed as rheumatism lumbar spondylosis knee arthropathy, etc., treatment for pain, commonly used some painkillers or closed and other therapies, the symptoms disappear, that is, that the disease is cured, resulting in misdiagnosis and misdiagnosis, so that the development of the disease to the middle and late stages, thus delaying the best time for patients. 2, middle stage femoral head necrosis, the symptoms are very obvious, mainly limp walking pain dysfunction, when taking X-rays, you will see most of the bone trabeculae disappeared, cystic changes, bone sclerosis, the femoral head cartilage fracture collapse. 3, late stage femoral head necrosis, the patient’s claudication is more serious, obviously feel short legs, walking difficulties, pain, X-rays will see the femoral head flattening, collapse, joint space narrowing or disappearance, obvious cystic changes, osteosclerosis area is larger, femoral head cartilage completely fractured, joint surface rough.