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Definition:

Septic arthritis is inflammation of a joint due to a bacterial infection other than gonorrhea (joint infection due to gonorrhea has different symptoms).



Alternative Names:

Bacterial arthritis; Non-gonococcal bacterial arthritis



Causes, incidence, and risk factors:

Septic arthritis develops when bacteria spread through the bloodstream to a joint. It may also occur when the joint is directly infected with bacteria by an injury or during surgery. The most common sites for this type of infection are the knee and hip.

Most cases of acute septic arthritis are caused by organisms such as staphylococcus or streptococcus.

Chronic septic arthritis (which is less common) is caused by organisms such as Mycobacterium tuberculosis and Candida albicans.

The following increase your risk for septic arthritis:

  • Artificial joint implants
  • Bacterial infection elsewhere in your body
  • Chronic illness or disease (such as diabetes, rheumatoid arthritis , and sickle cell disease)
  • Intravenous (IV) or injection drug use
  • Medications that suppress your immune system
  • Recent joint trauma
  • Recent joint arthroscopy or other surgery

Septic arthritis may be seen at any age. In children, it occurs most often in those younger than 3 years. The hip is a frequent site of infection in infants.

Septic arthritis is uncommon from age 3 to adolescence. Children with septic arthritis are more likely than adults to be infected with group B streptococcus or Haemophilus influenza ., if not immunized.



Symptoms:

Symptoms usually come on quickly, with joint swelling , intense joint pain , and low-grade fever.

Symptoms in newborns or infants:

  • Cries when infected joint is moved (example: diaper change causes crying if hip joint is infected)
  • Irritability
  • Fever
  • Unable to move the limb with the infected joint (pseudoparalysis)

Symptoms in children and adults:

  • Inability to move the limb with the infected joint (pseudoparalysis)
  • Intense joint pain
  • Joint swelling
  • Joint redness
  • Low-grade fever

Chills may occur, but are uncommon.



Treatment:

Antibiotics are used to treat the infection.

Rest, immobilization, elevation, and cool compresses may help relieve pain. Performing exercises for the affected joint helps the recovery process.

If joint (synovial) fluid builds up rapidly in the joint as a result of the infection, frequent aspiration of the fluid by inserting a needle into the joint may be needed. Severe cases may need surgery to drain the infected joint fluid.



Support Groups:



Expectations (prognosis):

Recovery is good with prompt antibiotic treatment. If treatment is delayed, permanent joint damage may result.



Complications:
  • Joint degeneration (arthritis)


Calling your health care provider:

Call for an appointment with your health care provider if you develop symptoms of septic arthritis.



Prevention:

Preventive (prophylactic) antibiotics may be helpful for people at high risk.



References: Espinoza LR. Infections of bursae, joints, and bones. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier. 2007: chap 290.


Review Date: 5/30/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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