The claim that white vinegar eliminates knee effusion is unscientific and there are no studies that show that white vinegar has the ability to eliminate knee effusion. Knee effusion is clinically known as knee joint effusion. Normally, there is about 4 milliliters of fluid in the knee joint, and trauma, infection, and degenerative disease may cause fluid to accumulate in the knee joint. Treatment for knee joint effusion is usually medication and surgery. The use of non-steroidal anti-inflammatory drugs, such as ibuprofen, promotes the resolution of the effusion. In severe cases, surgery, such as arthroscopy, is required to eliminate the effusion, and the primary cause of the disease should be actively treated. There is no scientific research to suggest that white vinegar can eliminate knee effusions. On the contrary, white vinegar is irritating and may cause skin damage with regular use. If you are diagnosed with knee effusion, it is recommended that you go to a regular hospital for treatment under the guidance of your doctor, and do not use white vinegar or other methods without authorization to avoid delaying your condition.