Abst 0450 #ACR21 @RheumNow PSOAS cohort 4 trajectories of radiographic progression in AS: Non-progressors 37%, late-progressors 26%, early-progressors 19%, rapid-progressors 18%.⬆️ disease burden: male, longer disease duration & smoking . ⬆️eCRP=higher disease progression https://t.co/wUdBNzJPy0