Noninflammatory*: <2000 WBC per mm3 (2 x 109 per L) | Inflammatory: >2000 WBC per mm3 |
Osteoarthritis | Septic arthritis¶ |
Trauma | Crystal-induced monoarthritis (eg, gout, pseudogout) |
Avascular necrosis | Rheumatoid arthritis and juvenile idiopathic arthritis |
Charcot's arthropathy | Spondyloarthritis |
Hemochromatosis | Systemic lupus erythematosus |
Pigmented villonodular synovitis | Lyme disease |
WBC: white blood cell.
* Overtly hemorrhagic noninflammatory fluid may have a WBC count approaching that of blood.
¶ Synovial fluid analysis in patients with septic arthritis often shows more than 90% polymorphonuclear neutrophilic leukocytes.
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