Most of the knee effusion is caused by knee osteoarthritis or trauma, there is no fast way to eliminate, according to the reason can be taken conservative treatment, puncture extraction, etc.. 1. Osteoarthritis of the knee joint: it is caused by the degeneration of the articular cartilage, which induces aseptic inflammation of the knee joint and then leads to inflammatory exudate, and knee effusion occurs, which can be treated conservatively. First of all, local braking rest, oral non-steroidal anti-inflammatory analgesic drugs, such as: celecoxib, etc., to control the inflammatory reaction, promote the absorption of fluid, so that the knee fluid quickly and effectively reduce the elimination. 2. Trauma: If the structure of the knee joint is damaged during exercise, such as meniscus injury, it will lead to obvious bloody effusion in the knee, and the damage is relatively mild. Conservative treatment of ice packs within 72 hours to promote capillary contraction and reduce bleeding. Oral non-steroidal anti-inflammatory painkillers, such as ibuprofen, to reduce swelling and pain; more serious injury with more fluid, the feasibility of puncture to extract the fluid in the cavity, rapid and effective elimination of fluid. All of the above medications should be used under the guidance of a doctor, avoid self-medication, and if knee pain occurs, it is recommended to consult a doctor in a timely manner.