Many patients want to understand the interventional treatment of femoral head necrosis in the end there is no effect, to clarify this issue before we first understand what is DSA, DSA is “digital subtraction angiography” for short, that is, the application of computers and imaging equipment with contrast to show the thickness of blood vessels, distribution, travel and other conditions clinical mainly for vascular It is mainly used for the examination of vascular diseases. Vascular interventions are performed by percutaneous puncture of the blood vessels through interventional catheters or guidewires and then along the blood vessels to reach the lesion area, releasing drugs or therapeutic materials locally to achieve precise and efficient treatment effects, such as drug thrombolysis, drug chemotherapy, balloon dilation, stent placement and many others. So is it feasible to treat femoral head necrosis? The answer is no. The theory of DSA intervention is derived from the interventional thrombolytic therapy for myocardial infarction or cerebrovascular infarction, but in fact, this therapy cannot be copied and used. It has been reported that myocardial infarction should be treated within 12 hours after the onset of the disease, while the efficacy of treatment is best within 2-3 hours and decreases with time. In contrast, cerebrovascular thrombosis is treated with a time window of 3 hours for intravenous thrombolysis and 6 hours for arterial thrombolysis. Beyond these time limits, treatment is switched to other methods. However, according to the current level of diagnosis, the shortest interval between the start of medication for corticosteroid osteonecrosis and a positive magnetic resonance imaging (MRI) (stage I) is 4 weeks, according to the latest data. Since most of the osteonecrosis of the femoral head has no clinical symptoms and signs in the early stage, it is difficult to alert patients and physicians. By the time symptoms such as hip pain and claudication appear, or when X-rays and CT scans show positive changes, it may have been several months or even more than a year since the occluded blood vessels have already been mechanized or even disappeared. Or who can find the occluded blood vessel in the femoral head within one day and perform the melting operation at the same time? In fact, it is ridiculous to consider interventional thrombolysis as an elective procedure rather than an emergency procedure, so it is theoretically implausible to say that DSA revascularization for femoral head necrosis. In practice, many of the patients in my clinic have received similar treatment and have responded with little efficacy, and their disease development is no different from other patients. In addition, there are many side effects such as infections and bleeding risks. The majority of patients do not want to be confused by some profound words, do not think there are a few letters is something great, science is very simple science is not magnificent, DSA interventional treatment of femoral head necrosis as a beautiful exploration should become history!