Excess fluid around the joint of the knee occurs when the knee experiences trauma, when the individual did not allow the knee to heal from an injury before using it, or as a symptom of another condition, according to Mayo Clinic. There is no actual water surrounding the knee.
To determine the cause of the excess fluid around the knee, the physician must extract some of the fluid, which helps to reduce pain and swelling, claims Mayo Clinic. Common injuries that cause fluid to collect around the knee include broken bones, meniscus tears and ligament tears. Fluid around the knee is common in individuals suffering from osteoarthritis, bursitis and rheumatoid arthritis, but it may also occur in individuals suffering from infections, gout, cysts and bleeding disorders.
Treatment options include medications and injections to eliminate pain and the amount of fluid around the knee, says Mayo Clinic. Antibiotics are prescribed in cases caused by infections while corticosteroid injections or medications may be taken to reduce swelling and treat inflammation. Treatments requiring invasive surgery include removing and repairing loose and damaged tissue and undergoing knee replacements.
Preventing excess fluid around the knee from occurring or reoccurring involves close monitoring by an individual's physician, according to Mayo Clinic. Individuals may also ensure they do not put too much strain on the knees or allow thigh muscles to become too weak.