The prognosis of patients with femoral head necrosis varies depending on the cause, the extent of necrosis, and the degree of progression of the disease. If patients are undergoing drug treatment, the following problems must be noted. First, there is no drug that can be proven to have a definite effect on the condition of osteonecrosis of the femoral head and can stop the development of the disease. Once femoral head necrosis is clinically diagnosed, the disease will gradually develop and the view that the pathological process is irreversible remains unchanged. Although a variety of non-surgical approaches are available in the clinic, none of them are the result of a large, multicenter, long-term clinical follow-up. The current pharmacological treatment of the disease, whether it is in the form of prescription drugs or tonics, or in the form of Western or Chinese medicine, is mostly evidence-based and experimental. The reasonable treatment method should be different from person to person. Second, once the necrosis of the femoral head begins, it will be accompanied by tissue repair changes. Simply put, the main process is definitely the growth of new blood vessels, the absorption of necrotic tissue, and the proliferation of connective tissue. Unfortunately: 1) the growth of blood vessels is unpredictable and uncontrollable; 2) the speed and extent of necrotic tissue resorption is unpredictable and uncontrollable; 3) the growth of connective tissue can be fibrous, cartilage-like or bone-like, and whether it will eventually become healthy bone tissue is unpredictable and uncontrollable. Therefore, the result is: A. Femoral head necrosis is ischemia-induced necrosis, drug treatment can promote local revascularization, that is, through the collateral circulation and new blood vessels to improve the local blood supply, the blocked blood vessels are unlikely to reopen. Local revascularization is a “double-edged sword”, with the advantage of creating conditions for osteogenesis, and the disadvantage that it is impossible to artificially control the rate and extent of revascularization. Excessive vascularization can cause rapid bone resorption, resulting in a rapid decrease in the mechanical strength of the femoral head, which can lead to femoral head collapse and failure of conservative treatment. B. New bone growth is a very complex process. Local ischemia and hypoxia may lead to new fibrous and cartilaginous tissues, but not bone tissues. What is the result of the repair requires continuous clinical observation to reach a conclusion. C. From clinical observation, the prognosis of necrosis is better for those with simple causes, early diagnosis of necrosis, limited and small necrosis, and the location of necrosis in the lower part of the femoral head, which are more likely to respond well to drug treatment. On the contrary, necrosis caused by hormone or alcohol, total head necrosis or necrosis foci in the femoral head outside the upper front, and serious underlying disease, are less likely to respond well to drug therapy. Third, simply put, during drug treatment, it is almost impossible not to have a decrease in the mechanical strength of the femoral head, and the end of the decrease is the inability to resist the effect of gravity such as weight, and thus the femoral head will be deformed and collapsed. Once the femoral head collapses, the failure of conservative treatment is basically predicted. This is the purpose that patients should use crutches in the progressive stage of necrosis. Fourth, many clinical patients with femoral head necrosis are young patients, despite the advice of doctors, there are still patients who do not take it seriously until the femoral head deformation and collapse, and then regret it. It is impossible to completely prevent the occurrence of femoral head deformation and collapse by using crutches, but it is certainly dangerous not to use crutches. If the osteogenic repair of the femoral head occurs after medication and the physician has reason to believe that the mechanical strength of the femoral head is good enough, then crutches can no longer be used. The purpose of crutches is to provide protective weight-bearing during femoral head repair and is no less important than the medication itself.