TY - JOUR T1 - Editorial: Late-Onset Spondyloarthritis: Subset That Should Not Be Forgotten JF - The Journal of Rheumatology JO - J Rheumatol DO - 10.3899/jrheum.120184 SP - jrheum.120184 AU - Ignazio Olivieri AU - Salvatore D'Angelo AU - Carlo Palazzi AU - Pietro Leccese AU - Angela Padula Y1 - 2012/05/15 UR - http://www.jrheum.org/content/early/2012/05/14/jrheum.120184.abstract N2 - The spondyloarthritis (SpA) complex embraces ankylosing spondylitis (AS), reactive arthritis (ReA), psoriatic arthritis (PsA), arthritis related to inflammatory bowel disease (IBD), and forms that do not fulfil established criteria, which are labelled as undifferentiated SpA (uSpA). In the early 1990s, 2 sets of classification criteria were suggested to encompass the clinical spectrum of SpA: the Amor criteria and the European Spondylarthropathy Study Group (ESSG) criteria. ER -