How long you should wear anti-thrombotic socks depends largely on the specific case of the blood clot that needs to be prevented. In the case of postoperative patients undergoing routine surgery or postoperative patients undergoing orthopedic joint surgery, elastic stockings can be used for about 2-3 weeks in addition to basic treatment to prevent thrombosis. In the case of a previous thrombosis, where the thrombus has partially recanalized and the ultrasound reveals that the thrombus has not completely dissolved, lifelong use of compression stockings is often required because the valve has been damaged, and in other cases such as dilated veins in the lower extremities, or dilated intermuscular veins and stagnant blood, lifelong use of compression duty is also required for the prevention of venous thrombosis in the lower extremities.