PReS-FINAL-2115: Differences in musculoskeletal clinical expression between Spanish and Mexican patients with juvenile spondyloarthritis: data from the Mexespa project

Introduction Juvenile spondyloarthritis (J-spa) is characterized by a predominantly peripheral involvement and more frequent presentation as undifferentiated forms. However, like its adult-onset equivalent, it has the potential to develop structural damage and evolve to juvenile ankylosing spondylitis (J-AS), with consequent functional impairment that will last for the lifetime of the patient. Although descriptions of jspa in worldwide different populations are scarce, it has been suggested that clinical expression could be different in Spanish and Mexican patients.