Water on the knee

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Symptoms

By Mayo Clinic staff

Signs and symptoms of water on the knee typically include:

  • Swelling. One knee may appear larger than the other. Puffiness around the bony parts of your knee appears prominent when compared with your other knee.
  • Stiffness. When your knee joint contains excess fluid, you may not be able to bend or straighten your knee as far as you normally could.
  • Pain. Depending on the cause of the fluid buildup, the knee may be very painful — to the point that it's impossible to bear weight on it.

When to see a doctor
Seek prompt medical attention if:

  • Self-care measures or prescribed medications don't relieve the pain and swelling
  • One knee becomes red and feels warm to the touch as compared to your other knee
References
  1. Frequently asked questions about osteoarthritis of the knee. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=A00228. Accessed Jan. 18, 2010.
  2. Johnson MW. Acute knee effusions: A systematic approach to diagnosis. American Family Physician. 2000;61:2391.
  3. Mathison DJ, et al. Approach to knee effusions. Pediatric Emergency Care. 2009;25:773.
  4. Knee problems. National Institute of Arthritis and Musculoskeletal and Skin Diseases. http://www.niams.gov/Health_Info/Knee_Problems/default.asp. Accessed Jan. 18, 2010.
DS00662 March 6, 2010

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