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What is water on the knee?

Knee effusion, sometimes called water on the knee, occurs when excess fluid accumulates in or around the knee joint. Common causes include arthritis and injury to the ligaments or meniscus, which is cartilage in the knee.

Source: Medical News Today

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  • American Association of Hip and Knee Surgeons
  • American Academy of Orthopedic Surgeons
  • Alpha Omega Alpha Honor Medical Society
  • Sibley Memorial Hospital
  • Johns Hopkins University