5 yr prospective observational study of 246 pts w/ nonradiographic Axial Spa shows that 16% of nr-axSpA progressed to r-axSpA w/in 5 yrs. SI progression more likely w/ Male sex (HR 3.16), imaging sacroiliitis (HR 6.6), & good NSAID response (HR 4.6) https://t.co/kXXhYaNqRz https://t.co/OD0rowut9k