Systemic onset juvenile idiopathic arthritis: a retrospective study of 80 consecutive patients followed for 10 years.

Abstract

Systemic onset JA may present with different clinical courses; the functional outcome is always good in subtype I (monocyclic), but can be poor in subtypes II and III. The severity of disability evaluated according to Steinbrocker classes is dependent on the cumulative duration of the active periods of the disease.