Prediction of inactive disease and relapse in oligoarticular juvenile idiopathic arthritis

The aim of this study is to describe clinical features of patients with oligoarticular juvenile idiopathic arthritis (JIA) who achieved inactive disease at 3rd month and also to determine the predictors of relapse and extended course. In the cohort study, 88 patients with oligoarticular JIA were retrospectively analyzed. The demographic data, clinical features, medications, relapse rates were recorded. Juvenile Arthritis Disease Activity Score (JADAS) and American College of Rheumatology Pediatric criteria were used to measure disease activity and treatment response at 3, 6 and 12 months. Fifty-nine (67%) patients were females and the mean age at diagnosis was 7.9 ± 4.3 years. The odds of achieving inactive disease (JADAS ≤1) at 3rd month were increased by a lower JADAS27 score at admission. Forty-one (48.8%) of 84 patients relapsed. Ankle involvement at onset, high JADAS27 score at admission, increased ESR at admission and presence of synovial hypertrophy in imaging were risk factors for occurrence of relapse. Our results show that a significant proportion of oligoarticular JIA patients relapse after inactive period. JADAS is a useful tool to guide the treatment decisions of patients who may be at risk of high disease activity and relapse.