Children with Oligoarticular Juvenile Idiopathic Arthritis are at Considerable Risk for Growth Retardation

ObjectiveTo assess linear growth in patients with persistent oligoarticular juvenile idiopathic arthritis (JIA) treated by intra-articular corticosteroid injections (IACSI).Study designData were obtained from a retrospective review of the charts of 95 patients with persistent oligoarticular JIA (69 females). The mean age at first visit was 4.9 ± 3.4 years, with follow-up of 6 ± 3.7 years. The height SDS for chronologic age (z-score) was correlated with the clinical course of the disease and compared among patients treated by IACSI alone (group I) or by a combination of disease-modifying antirheumatic drugs (DMARDs) (group II).ResultsGrowth retardation was found in 35.8% of patients (Δ z-score <−0.3), including 11.6% with severe growth retardation (Δ z-score <−1.0). Growth retardation was found in a smaller proportion of patients in group I (any growth retardation, 30.6%; severe growth retardation, 6.5%) than in patients in group II (any growth retardation, 44.4%; severe growth retardation, 21.2%; P < .05). Elevated erythrocyte sedimentation rate values (≥40 mm/1sth) indicated a significantly higher risk for growth retardation. All other clinical variables had no association with growth retardation.ConclusionA significant proportion of patients with persistent oligoarticular JIA have growth retardation and a minority have severe growth retardation. Only elevated erythrocyte sedimentation rate values were proven to be a good predictor of risk for growth retardation.