How to get rid of water on the knee

Water on the knee is everyday language for extra fluid in or around the knee joint, also called an effusion. It may follow an injury such as an ACL Tear or Meniscus Tear, irritation from Knee Osteoarthritis or Knee Bursitis, or inflammation from Gout. A Baker's Cyst can create fullness behind the knee. The appearance of swelling alone cannot identify the cause.

Reduce activities that load or twist the knee, elevate the leg when resting and use a wrapped cool pack for short periods if it feels helpful. Do not puncture or press the swelling yourself. A clinician may examine the joint and consider imaging or fluid testing. Joint Aspiration can remove fluid and sometimes helps identify infection, bleeding or crystals; it is performed by a trained professional. Further treatment may include rehabilitation, medicine or management of the underlying condition.

Seek urgent assessment for a swollen, hot or red knee with fever, chills or feeling unwell. Get prompt care after an injury if the knee changed shape, locked, gives way or cannot bear weight. Arrange a review for swelling that returns, steadily increases, limits bending or remains unexplained.

Ask what findings point to injury, arthritis, bursitis, gout or a cyst, and whether fluid testing or imaging is needed. Ask which activities are safe, whether aspiration is appropriate, and how recurrence will be prevented.