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While enthesitis, dactylitis and nail involvement are recognised as important outcomes of psoriatic arthritis (PsA) in the core set of domains in PsA,1 2 it is still unclear how these outcomes should best be measured.1 2 We systematically reviewed the instruments and the cut-offs used to report state or improvement, for enthesitis, dactylitis and nail involvement in recent randomised controlled trials (RCTs) in PsA.
A systematic literature review of RCTs on any pharmacological intervention in patients with PsA was conducted to inform the European League Against Rheumatism (EULAR) recommendations for the management of PsA, by searching Medline, Embase and Cochrane datasets for the period 2010–2015.3 4 Only published papers and only results of the placebo-controlled phases were analysed. The presence and type of all outcome measures reflecting enthesitis, …
Contributors All authors contributed to this letter and approved its last version.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.