Abstract
Rheumatoid arthritis (RA) is a systemic disease of autoimmune nature, which leads to osteoarticular impairment. Juvenile idiopathic arthritis (JIA) is a group of articular disease that affects individuals under 16 years of age. The polyarticular JIA has some peculiarities of RA: symmetrical involvement of small and large joints, bone destruction and disability, if not treated properly. In…