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Water on the knee is when fluid collects around and inside the knee joint, causing pain and swelling. Also known as knee effusion or fluid on the knee, it can occur whenever there's damage to the joint due to injury or underlying disease, such as arthritis.

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Source: Verywell Health

  • American Academy of Orthopaedic Surgeons
  • The Arthroscopy Association of North America
  •  Alpha Omega Alpha Honor Medical Society
  • virginia commonwealth university
  • University of Tennessee Health Scinece Center