A small amount of effusion in the right ankle joint can be treated by the following methods: First, a small amount of effusion in the right ankle joint can usually be treated conservatively by using ultrashort wave therapy, herbal iontophoresis therapy, and oral non-steroidal anti-inflammatory pain medications, such as celecoxib and loxoprofen sodium, which can promote the absorption of inflammation and the effusion subsides. Second, a large amount of fluid in the right ankle joint, if it is caused by synovitis, arthroscopic minimally invasive surgery can be used to remove the fluid and eliminate the inflammatory synovium to prevent the reoccurrence of the fluid. After surgery, patients should cooperate with local cold compresses and rehabilitation training to actively practice the strength and intensity of the muscles around the ankle joint to enhance the stability of the ankle joint, protect the ankle joint and prevent the recurrence of effusion. Muscle exercises mainly focus on resistance training, which can be supplemented by elastic bands or sandbags, and daily adherence to training will have obvious clinical effects in 3-6 months.