Comparison of 2 criteria for "difficult to Rx PsA" - 378 pts - 19.8% met Perrotta criteria, & 15.3% met Kumthekar D2T criteria. Sensitivity 30-38%, but specificity 82- 86%, w/ good agreement betw 2 sets. D2T-PsA research is needed! https://t.co/MUWPsargrU https://t.co/P40DAkb5qT