Pressure pain on the inside of the ankle after arthroscopy is not necessarily a blood clot. Simple pressure pain on the inside of the ankle after arthroscopy may be caused by trauma and is usually not due to a blood clot. There are venous thrombosis and arterial thrombosis, and the symptoms are different. In the case of venous thrombosis, the foot will be swollen and painful, and the swelling and pain will worsen when standing upright and walking, along with a change in skin color. In the case of arterial thrombosis, the foot will be cool, numb and the skin color will be pale, etc. In severe cases, there may be blackening of the toes, or even ulcers and gangrene. Arthroscopic postoperative pain on the inside of the ankle by pressure should, in time, go to the regular hospital, by the doctor according to the symptoms, signs and auxiliary examination to determine the cause of the disease, for the cause of the disease to give the correct treatment method.