The main pathology of osteonecrosis of the femoral head, which is known as “immortal cancer”, is caused by the destruction of blood flow to the femoral head, which is mostly called ischemic necrosis of the femoral head or aseptic necrosis of the femoral head. The early symptoms of osteonecrosis of the femoral head are not too obvious and usually have little effect on the patient, so it often gives the patient a false impression and makes it easy to miss the time for treatment. Once the condition is not effectively controlled, it will cause the disappearance of most of the femoral head, resulting in lifelong incapacity, inability to live a normal life and loss of labor ability. Femoral head necrosis is no longer a patent for the elderly, but for young people, it undoubtedly puts a lock on their happy lives, causing considerable harm to patients’ lives, feelings and work, thus bringing a great mental burden to them. In recent years, the incidence of femoral head necrosis has a rising trend, which is related to people’s fast-paced life, accidental trauma, hyperlipidemia caused by smoking and drinking, lack of exercise, etc., blood hypercoagulation state, long-term use of hormones and other drugs. Because the pain of femoral head necrosis is not obvious in the early stage, and can be reduced or disappeared after resting or reducing activities, it is often ignored by patients or misdiagnosed as rheumatoid arthritis or lumbar intervertebral disc herniation, etc. Therefore, for those who have a history of hip trauma, long-term use of hormonal drugs, and love smoking and drinking, when there is a slight pain in the hip and aggravated by weight-bearing, pulling pain in the knee joint area, fear of cold in the lower limbs, walking without strength, soreness and numbness, sometimes one symptom, or several symptoms, which may persist or disappear in a short period of time, you should go to the hospital at this time. The cause of femoral head necrosis is not well understood; the early pain is caused by synovitis, which means that there is inflammation in the joint, and it is particularly painful because of the stimulation of inflammatory factors. Later, as the bone is affected by insufficient blood supply or other factors and is damaged, it is not supported enough and there is a possibility of microfracture, which leads to pain. What does microfracture mean? It means that the general structure of the bone appears to be fine, but the interior of the bone has collapsed. The pathological changes in the femoral head are actually collapse, and in the early stage when there is only collapse of the trabeculae inside the bone, it is called microfracture. Early detection and treatment of femoral head necrosis is beneficial to the recovery of the disease, so early treatment of femoral head necrosis must seize the opportunity. How to detect osteonecrosis of the femoral head at an early stage? From intermittent pain to persistent pain, then from pain to muscle spasm, joint movement is restricted, and finally cause serious disability and limp. 1, hip pain (soreness, hidden pain), can be involved in the groin (thigh root pain), the front inner thigh; 2, lesion hip mobility is reduced, especially the hip internal rotation disorder and induced pain; 3, knee pain: ischemic necrosis of the femoral head is a hip disease, but often manifested as knee pain, known as ectopic pain, is caused by ischemic necrosis of the femoral head pain radiation; 4, limp when walking, reduced after rest, lower limbs weakness. If these lesions can be controlled, it is possible to relieve the pain. Therefore, sometimes we use some anti-inflammatory drugs to make his synovial membrane not so edematous, and the pain may be controlled; by using some drugs to make the bone grow better and blood supply better, when the bone tolerance is better, the pain will be reduced; this can also do some minimally invasive surgery to preserve the femoral head, as if the house is going to collapse, after using a few pillars to hold it, the house will be supported to a certain extent, and we can improve the blood supply through Minimally invasive surgery to improve the blood supply. Early treatment methods include: 1. Conservative treatment: including internal and external use of drugs and physical therapy to achieve early cure. 2, DSA interventional perfusion method: through the femoral artery puncture cannula to the medial and lateral spinous artery and closed artery, directly injecting thrombolytic drugs and vasodilator drugs into the blood supply artery of the femoral head under the supervision and guidance of the interventional therapy system (DSA), so as to dissolve the fat embolus and small thrombus formed in the blood vessel and recanalize the blocked microvessels; make local vasodilation, improve microcirculation ischemia, unblock the hip joint near the microvascular, increase the side branch circulation and improve the nutrition of the femoral head; make the necrotic bone gradually be absorbed, or osteoblast proliferation, new bone formation, and repair the femoral head. 3.Ultrasound-guided precise puncture minimally invasive therapy: quickly open the blood flow, directly deliver the drug to the affected area, faster and more fully play the drug effect.