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Multiple psoriatic arthritis (PsA) classification criteria exist, but these are based on established PsA when pre-existing joint damage and the effect of medication may confound their validity. This study examined the application of the Veale classification criteria in early PsA to determine the effect of disease progression and treatment on classification and to determine the effect of the number of involved joints and the presence of distal interphalangeal (DIP) joint involvement at initial presentation on clinical and radiological outcome.

A classification study of clinical subsets in an inception cohort of early psoriatic peripheral arthritis--'DIP or not DIP revisited'