Femoral necrosis is known as the “undead cancer” in orthopedic diseases, with high disability rate and irreversible course. Because of the seriousness of osteonecrosis, patients have little understanding of the disease, and there are many misconceptions about osteonecrosis in society today: some people suspect that they have osteonecrosis when they have back pain; some people fall into a pessimistic and disappointing mood when they have osteonecrosis; some patients blindly believe in the so-called ancestral secret recipe, which delays the best time for treatment…. …In fact, there is no need to talk about osteonecrosis, osteonecrosis can be effectively prevented, treated, understand the basic knowledge of the disease, out of the misunderstanding of osteonecrosis is vital. Diagnosis of osteonecrosis beware of enlargement: a considerable number of patients who visit the clinic, hip pain is not osteonecrosis of the femoral head, but in the private medical institutions for a long time when the treatment of osteonecrosis of the femoral head, in fact, many patients are hip dysplasia hip arthritis, ankylosing spondylitis, rheumatoid, etc.. Today there is a tendency to expand the diagnosis of osteonecrosis of the femoral head due to the low level of technology or driven by commercial interests. When patients have hip pain and osteonecrosis susceptibility factors and suspect femoral head necrosis, they should go to the orthopedic department of a regular hospital and the diagnosis can be easily confirmed by an experienced physician through imaging examination. After diagnosis, treatment can reduce blindness. The imaging examinations commonly used for the diagnosis of femoral necrosis include: MRI and isotope bone scan can make the earliest diagnosis of osteonecrosis; isotope bone scan can be used for the screening of femoral head necrosis; MRI is the best means of early detection of osteonecrosis; it takes about 6 months to 1 year from the occurrence of osteonecrosis to the appearance of X-ray or CT scan, when osteonecrosis has progressed to at least stage II. Osteonecrosis treatment do not believe in the “ancestral secret recipe”: the so-called “sickness and anxiety, coupled with the folk on the treatment of osteonecrosis of various kinds, there are many patients with osteonecrosis to Wu aunt such blindly believe in the so-called “ancestral secret recipe The “Ancestral secret recipe”, spent a lot of time, money, the disease did not improve, but also delayed the best time for treatment. In fact, the human understanding of femoral head necrosis began in the 1860s, the treatment of osteonecrosis began in the 1950s, the systematic scientific research on femoral head necrosis began in the 1960s, China began to diagnose, treat and scientifically study osteonecrosis only in the late 1970s. The so-called “ancestral secret recipe” does not exist. Patients with osteonecrosis should go to a large hospital to find a department and physician specializing in this disease, scientific diagnosis and treatment, to avoid the disorderly treatment of disease, confused by folk physicians. Only the professional treatment of regular hospitals can achieve early diagnosis, effective treatment, but also reduce the cost of treatment, to achieve the effect of half the effort. Not all osteonecrosis requires artificial joint replacement: different treatment plans should be scientifically developed according to the different sites, areas and degrees of femoral head necrosis. Not all cases of osteonecrosis of the femoral head require surgery or even artificial joint replacement. According to our research, if the area of necrosis is less than 1/3 or the necrotic area is located in the non-weight-bearing area of the femoral head, only some painkillers can be used during the acute pain period, and there is no need for long-term medication, let alone surgery. The worst outcome of femoral head necrosis is femoral head collapse, whether to operate depends on whether it will collapse or not, for those who are at risk of collapse, early surgery is recommended. We have achieved good results by scraping the necrotic bone through the femoral head, implanting autologous bone and osteogenic material and fixing it with absorbable screws or rotational osteotomy of the femoral head through the femoral ridge. If the right choice is made, most patients can keep their femoral head without replacing the artificial joint. For patients with severe collapse of the femoral head and severe impairment of the entire joint function, modern total hip replacement is very effective, but the key lies in the placement technique and the materials chosen. In the hands of experienced physicians, the life expectancy of imported materials is more than 20 years, and about 90% of them are still excellent. Therefore, for those who need replacement, it is crucial to choose a hospital with good conditions and experienced physicians.