Joint effusion, commonly referred to as water on the knee or fluid on the knee, is the abnormal accumulation of fluid in or around a joint. It is most commonly caused by infection, injury, and arthritis. In addition to swelling, joint effusion is associated with pain and stiffness.
The approach to diagnosis depends on the joint involved. While aspiration of the joint is considered the gold standard of treatment, this can be difficult for joints such as the hip. Ultrasound may be used both to verify the existence of an effusion and to guide aspiration.
The treatment for Joint effusion include icing, rest and medication as advised by your doctor.
