The swelling of the leg after knee replacement usually subsides in about 2~3 months, and the exact time needs to be judged according to the actual condition. Swelling of the leg after knee replacement is caused by the influence of blood circulation in the leg after surgery; at the same time, the activity of the limb is reduced after surgery, and the pumping effect of the muscles is weakened, etc. Therefore, when swelling of the leg occurs, you can elevate the affected limb to promote blood return. Therefore, when leg swelling occurs, you can elevate the affected limb to promote blood reflux; you can also carry out functional exercises, such as ankle pump exercise, muscle contraction exercise, etc., which can help to promote blood circulation and promote swelling. After joint replacement, it is important to prevent infection and actively carry out rehabilitation exercises. If the swelling is serious, or accompanied by pain, redness, fever and other symptoms, you should go to the hospital for further treatment.