Juvenile Idiopathic Arthritis (JIA): A Clinically Oriented Update Based on Current Evidence
Prepared for the Practicing Rheumatologist / Pediatrician Definition & Epidemiology Juvenile Idiopathic Arthritis (JIA) is a heterogeneous group of chronic arthritides of unknown etiology onset before age 16, persisting ≥6 weeks. It represents an autoimmune/autoinflammatory condition with complex gene–environment interactions. Incidence: ~2–20 per 100,000 children/year; prevalence ~1 in 1,000 children in high-income countries (Hochberg et…