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• Invasion of joints by pyogenic microorganisms. One of the curable causes of arthritis. May be part of systemic infection/disease.
• System(s) affected: Musculoskeletal
• Synonym(s): Suppurative arthritis; Septic arthritis; Pyarthrosis; Pyogenic arthritis; Bacterial arthritis

• Predominant age:
  • Neisserial: Especially 15–40 years of age; can occur at any age
  • Nonneisserial (approximate):
    • Years <2: 60% Staphylococcus, 20% Streptococcus, 10% gram-negative rods, <5% miscellaneous
    • Years 2–14: 60% Staphylococcus, 30% Streptococcus, 5% Haemophilus, 5% other gram-negative rods, 5% miscellaneous
    • Adult: 60% Staphylococcus, 25% Streptococcus, <1% Haemophilus, and 15% other gram-negative rods
• Predominant gender:
  • Neisserial: Female > Male (4:1)
  • Nonneisserial: Male > Female (2:1)

• Neisserial:
  • Responsible for 50% of infectious arthritis
  • 0.6% of women with gonorrhea
  • 0.1% of men ...

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