Juvenile idiopathic arthritis
Definition
Joint effusion / pain / swelling in two or more joints
- > 6 weeks
- patient > 16 years
Variations
- number of joints affected: oligoarticular (<5) v polyarticular (5 or more)
- rheumatoid factor positive or negative
- systematic symptoms (rash / fever / lympadenopathy / organomegaly)
Epidemiology
1:10,000
Familial clusters
HLA-gene associations