Begins approximately 10d after strep infection (compared to 21d for rheumatic fever)
Arthritis
Generally more severe than that in RF
Non-migratory, mono or oligoarthritis
ASA-resistant
Erythema nodosum and erythema multiforme are frequently seen
Generally more severe than that in RF
Non-migratory, mono or oligoarthritis
ASA-resistant
Reactive poststreptococcal arthritis
Acute osteoarthritis
Reactive arthritis
Avascular necrosis
Rheumatoid arthritis
Crystal-induced 
Juvenile idiopathic arthritis
Gonococcal arthritis, arthritis-dermatitis syndrome