All::Rheumatology::Diseases::Septic arthritis

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What is the most common organism causing septic arthritis in adults?

Staphylococcus aureus.

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What is the most common organism in sexually active young adults with septic arthritis?

Neisseria gonorrhoeae (disseminated gonococcal infection).

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What is the most common cause of septic arthritis in adults through hematogenous spread?

Distant bacterial infections, such as abscesses.

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What is the most common location of septic arthritis in adults?

The knee.

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What are common features of septic arthritis?

Acute, swollen joint; restricted movement in 80% of patients; warm to touch/fluctuant on examination.

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What investigations are essential for suspected septic arthritis?

Synovial fluid sampling (prior to antibiotic administration), blood cultures, joint imaging.

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What is the recommended management for septic arthritis?

Intravenous antibiotics covering Gram-positive cocci (e.g., flucloxacillin or clindamycin), needle aspiration for joint decompression, arthroscopic lavage may be required, antibiotic treatment for several weeks with a switch to oral antibiotics after 2 weeks.

Septic arthritis