Patients with a small amount of effusion in the left ankle joint can undergo the following treatments: First, pay attention to rest: avoid excessive movement of the ankle joint and avoid getting cold in the ankle joint, which can effectively reduce the effusion and prevent it from further increasing. Secondly, physical therapy: for effusion caused by arthritis and synovitis, microwave physiotherapy and far-infrared physiotherapy can be carried out, which have a good effect on the absorption of effusion. Third, oral medication: If it is caused by synovitis, you can take oral synovitis tablets. If there is pain, you can take oral pain medication, such as meloxicam and celecoxib, for the treatment of effusion. Fourth, the treatment of topical creams: a part of the patients can be treated with creams, which also have a certain effect of reducing the effusion. A small amount of effusion in the ankle joint can generally be effectively reduced or disappeared after active treatment.