TY - JOUR T1 - Fibromyalgia and Enthesitis in Psoriatic Arthritis. Time to “Characterize” and “Refine” Clinical Definitions JF - The Journal of Rheumatology JO - J Rheumatol SP - 677 LP - 678 DO - 10.3899/jrheum.120095 VL - 39 IS - 4 AU - JOSÉ LUIS FERNÁNDEZ-SUEIRO Y1 - 2012/04/01 UR - http://www.jrheum.org/content/39/4/677.abstract N2 - Psoriatic arthritis (PsA) is a complex disease characterized by the presence of polyarthritis, spinal disease, dactylitis, enthesitis, and cutaneous involvement1. Due to considerable research efforts in PsA in recent years, criteria for classification of PsA2 (the CASPAR criteria) have been developed, as well as definitions of clinical features and how to assess them3. In terms of evaluating disease activity, efforts are being made to determine whether composite measures of disease activity and response to therapy can be developed to cover all the domains that characterize PsA4.At present a patient can be classified as having PsA by meeting the CASPAR criteria; nevertheless, in applying the criteria, it is mandatory that the patient must have an inflammatory articular disease (joint, spine, or entheseal). The lack of definition of these entry criteria, crucial for applying the CASPAR criteria, may explain some of the difficulties in clinical research in PsA; for instance, validation of the CASPAR criteria for diagnostic purposes encounters difficulty when criteria are used in a general setting5.Two recent studies5,6 testing the sensitivity of the CASPAR criteria in early PsA found different results (99.1% vs … Address correspondence to Dr. Fernández-Sueiro, Rheumatology Division, Complejo Hospitalario Universitario, C/. Xubias, 84, 15006, La Coruña, Galicia, Spain. E-mail: L.sueiro{at}canalejo.org ER -