What disease activity measures do you find helpful in clinical practice for psoriatic arthritis/peripheral spondyloarthritis?

Treat to target strategy has been shown to improve patient outcomes in patients with PsA (TICOPA study). Therefore, it is important to set treatment targets and measure disease activity in clinical practice in PsA. Measuring disease activity in this disease is, however, challenging due to heterogeneity in clinical presentation and its disease impact. Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) Outcome Measures in Rheumatology (OMERACT) working groups have recommended key domains to be measured in RCTs and longitudinal observational studies for PsA. Among them, one of the most important domains for both clinicians and patients is musculoskeletal (MSK) disease activity, which includes: peripheral joints, en...