Auvergne-Loire observatory on chronic inflammatory diseases of the musculoskeletal system occurring in childhood - Arthrites Juvéniles Idiopathiques cohort (long-term follow-up of children with juvenile idiopathic arthritis)

The primary objective of this project is to describe the very long-term progression of Juvenile Idiopathic Arthritis (AJI) in children, from onset of the disease until adulthood that extends past the transition period. The follow-up will particular focus on joint disease activity as well as very long-term repercussions.- The secondary objectives will be to provide data relating to treatment effectiveness and tolerance, especially concerning the outcome for children intolerant to methotrexate and the monitoring children in biotherapy. - This follow-up will also aid articulation between research and practice by proposing further studies in 3 areas: o nursing research and therapeutic education o study of bone microarchitecture o study of endothelial function and vascular abnormalities