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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.

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Source: Medical News Today

  • American Academy of Orthopaedic Surgeons
  • American Orthopaedic Society for Sports Medicine
  • The Arthroscopy Association of North America