(Bacterial Arthritis; Pyogenic Arthritis)
by Sid Kirchheimer
Septic arthritis (SA) is a joint infection. The joint reacts to it by filling with pus. It may also become swollen.
Bacteria is the most common cause of SA. It attaches to tissue and spreads.
Viruses and fungi can also cause SA. It is not as common.
The infection may be started by an organism:
Risk Factors TOP
SSA is more common in older adults and children 2-3 years old.
Here are some factors that may raise your risk:
Risk factors in children are:
The knee and hip are the most common site for SA in children. The knee, hip, shoulder, ankle, elbow, and wrist are the most common sites in adults.
Symptoms may include:
You will be asked about you or your child’s symptoms and health history. A physical exam will be done. Your doctor may refer you to a specialist.
Body fluids may need to be tested. This can be done with:
Pictures may be taken of your bodily structures. This can be done with:
Antibiotics are given as soon as SA is found. They are given by IV to start. This helps the joint get medication to kill the bacteria. The medicine you get depends on what is causing your infection. The rest of the antibiotics may be given by mouth.
Fluid may be removed from the joint so it is not harmed. This may be done with a needle or through surgery.
Rest, keeping the joint still, and warm packs may be used for pain. Physical therapy or exercises may also help you get better more quickly.
To lower your chance of SA, get treated for possible infections right away.
National Institute of Arthritis and Musculoskeletal and Skin Diseases
Ernst AA, Weiss SJ, Tracy LA, Weiss NR. Usefulness of CRP and ESR in predicting septic joints. South Med J. 2010;103(6):522-526.
Howard A, Wilson M. Septic arthritis in children. BMJ. 2010;341:c4407.
Ma L, Cranney A, Holroyd-Leduc JM. Acute monoarthritis: what is the cause of my patient's painful swollen joint? CMAJ. 2009;180(1):59-65.
Septic arthritis in adults. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T116123/Septic-arthritis. Updated May 30, 2017. Accessed June 11, 2018.
Septic arthritis in children. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T116123/Septic-arthritis. Updated December 5, 2017. Accessed June 11, 2018.
Septic arthritis. Patient UK website. Available at:
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Updated August 11, 2016. Accessed June 11, 2018.
Last reviewed June 2018 by EBSCO Medical Review Board Warren A. Bodine, DO, CAQSM
Last Updated: 6/11/2018
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