Risk factors
By Mayo Clinic staff- Age. Water on the knee tends to happen more often in people older than age 55.
- Sports participation. People who participate in sports that involve sudden changes of direction, such as basketball, are more likely to experience the types of knee injuries that cause water on the knee.
- Obesity. Excess weight causes more wear and tear on the knee joint. This increases your risk of osteoarthritis, one of the top causes of water on the knee.
References
- 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.
- Johnson MW. Acute knee effusions: A systematic approach to diagnosis. American Family Physician. 2000;61:2391.
- Mathison DJ, et al. Approach to knee effusions. Pediatric Emergency Care. 2009;25:773.
- 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.

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