Which definitions for MRI sacroiliac joint lesions predict the diagnosis of early axial spondyloarthritis best? : A 2-year follow-up in the SPACE cohort
BACKGROUND: The Leiden group and the Assessment of Spondyloarthritis International Society (ASAS)-MRI study group have proposed definitions for structural (SL) and active (AL) lesions typical for axial spondyloarthritis (axSpA) on MRI of the sacroiliac joints (MRI-SIJ).OBJECTIVES: To analyse the predictive validity of proposed SL and AL MRI-SIJ definitions in early axSpA and compare proposed AL wi
