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Tests and diagnosis
By Mayo Clinic staffImaging tests
- X-ray. Your doctor will request an X-ray to make sure you haven't broken or dislocated any bones, or to determine if you have arthritis.
- Magnetic resonance imaging (MRI). This test detects abnormalities of the bone or knee joint, such as a tear in your ligaments, tendons or cartilage.
Blood tests
A sample of blood taken from your arm can be tested for evidence of:
- Infection
- Inflammation
- Rheumatoid arthritis
- Lyme disease
- Bleeding disorders
- Gout
Joint aspiration (arthrocentesis)
During this procedure your doctor withdraws fluid from inside your knee, so it can be checked for:
- Blood, which may stem from injuries or bleeding disorders
- Bacteria, which may be causing an infection
- The crystals common to gout or to pseudogout
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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