Knee effusion

Etiology

  • Trauma, eg, fracture, ligament or meniscal injury, overuse
  • Infection, eg, gonococcal, Staphylococcus aureus, Lyme disease, tuberculosis
  • Gout or pseudogout
  • Seronegative spondyloarthropathy, eg, reactive arthritis (Reiter’s syndrome)
  • Rheumatoid arthritis
  • Osteoarthritis or inflammatory osteoarthritis
  • Hemarthrosis due to bleeding disorder
  • Malignant or benign tumor

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