Femoral vascular intervention: It is a procedure in which a catheter is inserted into the femoral artery → deep femoral artery → medial femoral artery via the opposite (same) femoral artery, and anticoagulant or thrombolytic drugs are injected directly into the medial femoral artery through the catheter. The purpose is to recanalize the occluded femoral head vessels by the action of thrombolytic or anticoagulant drugs. The principle of femoral vascular thrombolysis comes from coronary angiography and thrombolysis, but the problem is: 1. Coronary thrombolysis is effective within 3 hours of the occurrence of arterial occlusion, and beyond this time limit, the effect is not obvious; 2. Vascular occlusion of the femoral head occurs at least months or even years before the appearance of clinical symptoms, long after the time limit of several hours, thrombolytic or anticoagulant drugs will certainly have no effect; 3. Osteonecrosis of the vessels Occlusion occurs in the femoral head capillaries, is the femoral head microcirculation damage, and coronary artery occlusion mechanism is completely different, therefore, the coronary artery occlusion treatment effective method, for osteonecrosis will not have an effect. 4, the cytotoxicity of thrombolytic drugs and drug pressure injection may cause damage to the endothelial cells of blood vessels, leading to further occlusion of blood vessels, further destruction of blood flow in the femoral head, and accelerating the process of (heavy) osteonecrosis. Therefore, interventional treatment for ischemic necrosis of the femoral head is an unhelpful or even harmful treatment method.