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Tests and diagnosis
By Mayo Clinic staffThe following tests typically help diagnose septic arthritis:
- Joint fluid analysis. To discover exactly what bacterium is causing your infection, your doctor usually takes a sample of the fluid within your joint (synovial fluid) through a needle inserted in the space around your joint. Synovial fluid normally appears clear and thick. Bacterial infections can alter the color, consistency, volume and makeup of the synovial fluid. Lab analysis of your synovial fluid iincludes tests to determine what organism is causing your infection.
- Blood tests. Your doctor may order blood tests to see if bacteria are present in your bloodstream.
- Imaging tests. X-rays and other imaging tests of the affected joint also may be ordered to assess any damage to the joint.
References
- George HO, et al. Bacterial arthritis. In: Firestein GS, et al. Kelley's Textbook of Rheumatology. 8th ed. Philadelphia, Pa.: W.B. Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/202388075-9/0/1807/746.html?tocnode=55734150&fromURL=746.html#4-u1.0-B978-1-4160-3285-4..10099-3_3613. Accessed May 30, 2010.
- Garcia-De LaTorre I, et al. Gonococcal and nongonococcal arthritis. Rheumatic Disease Clinics of North America. 2009;35:63.
- Zinc BJ, et al. Bone and joint infections. In: Marx JA, et al., eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 6th ed. St. Louis, Mo.:Mosby;2006. http://www.mdconsult.com/book/player/book.do?method=display&type=bookPage&decorator=header&eid=4-u1.0-B978-0-323-05472-0..00134-1--s0180&uniq=202388075&isbn=978-0-323-05472-0&sid=1002434146#lpState=open&lpTab=contentsTab&content=4-u1.0-B978-0-323-05472-0..00134-1--s0110%3Bfrom%3Dtoc%3Btype%3DbookPage%3Bisbn%3D978-0-323-05472-0. Accessed May 30, 2010.
- Ohl CA. Infectious arthritis of native joints. In: Mandell GL, et al. Mandell, Bennett, & Dolin: Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2005. http://www.mdconsult.com/book/player/book.do?method=display&type=bookPage&decorator=header&eid=4-u1.0-B978-0-443-06839-3..00102-8&displayedEid=4-u1.0-B978-0-443-06839-3..00102-8--s0015&uniq=202388075&isbn=978-0-443-06839-3&sid=1002438834. Accessed May 30, 2010.
- Goldenberg DL. Septic arthritis in adults. http://www.uptodate.com/home/index.html. Accessed May 30, 2010.
- Krogstad P. Bacterial arthritis: Clinical features and diagnosis in infants and children. http://www.uptodate.com/home/index.html. Accessed May 30, 2010.
- Steckelberg JM (expert opinion). Mayo Clinic, Rochester, Minn. June 3, 2010.
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