Prospective study of 490 mod-to-severe psoriasis compared prospectively by exam & US for PsA - 384 w/o arthritis (Silent PSO), 80 non-PSO & 106 w prodromal or active PsA (12.7%). US synovio-enthesitis in 1.8% of controls & 16.1% of silent PSO (p< 0.001) https://t.co/kUdIwLnfYL https://t.co/dgIaOXaJKR