Annals of the Rheumatic Diseases 2008;
67:1495-1496; doi:10.1136/ard.2008.088039
Copyright © 2008 BMJ Publishing Group Ltd & European League Against Rheumatism.
On the applicability of the CASPAR criteria in psoriatic arthritis
O B Pedersen,
P Junker
Department. of Rheumatology, Odense University Hospital, Odense, Denmark
Correspondence to:
Dr O B Pedersen, Department of Rheumatology, Odense University Hospital, Sdr Boulevard 29, DK-5000 Odense C, Denmark; obpedersen@health.sdu.dk
Accepted 24 March 2008
| The first 150 words of the full text of this article appear below. |
While conducting a cross-sectional, population based twin study on psoriatic arthritis (PsA),1 we concurrently adopted the items required for the classification of PsA according to the Moll and Wright (M&W) definition,2 the Vasey and Espinoza (V&E) criteria3 and the CASPAR criteria.4 The study was based on questionnaire surveys to all Danish twins. This method identified 228 twins with self-reported PsA. After subsequent invitation, 164 twins participated in the diagnostic validation that included telephone interview, scrutiny of medical files, structured interview, clinical examination and serological tests for rheumatoid factor.
Box 1 Modified CASPAR criteria (proposed modifications in italics)
To meet the CASPAR (Classification criteria for Psoriatic ARthritis) criteria, a patient must have inflammatory articular disease (joint, spine or enthesal) at current examination or previously documented by a rheumatologist with 
3 points from the following five categories:
- Definite psoriasis or a personal history of psoriasis or a family history of psoriasis*
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