Intra-articular injection in patients with juvenile idiopathic arthritis: factors associated with a good response.

INTRODUCTION:Intra-articular injection of corticosteroids (IIC) for treatment of patients with juvenile idiopathic arthritis (JIA) is increasingly used in Pediatric Rheumatology. OBJECTIVES:To describe the clinical course of patients undergoing IIC in our Pediatric Rheumatology Unit. METHODS:Retrospective study of patients with JIA undergoing IIC from January 2008 to December 2012, with a minimum follow-up of six months after the injection. Good response to IIC was set as the presence of inactivity on the infiltrated joint by at least six months. RESULTS:Eighty-eight patients underwent a total of 165 IICs. Of these, 75% were girls and 35.2% had persistent oligoarticular JIA. The mean age at diagnosis was 6.8 years, and when IIC was carried out, 12.2 years. Regarding patients, younger age at diagnosis (p=0.037) and the occurrence of uveitis in the course of the disease (p=0.015) were associated with good response to IIC. From 165 IICs, 63% had a good response and joints remained inactive for a median of 18.1 months. The type of joint injection (p=0.001), lesser values stated in the overall visual analog scale by the physician (p=0.015) and by parents/patient (p=0.01) have been associated with a good response to IIC. Nine adverse events (5.4%) were observed. CONCLUSION:In our study, more than half of the joints showed a good response to IIC. Younger patients at diagnosis and uveitis during the course of the disease had good response to IIC. Knees, wrists and elbows were the joints that best responded to IIC. IIC proved to be a safe procedure.