Methods We generated consensus definitions for bone spurs and ankylosis observed on sagittal images of T1-weighted MRI scans that included lesions at anterior and posterior vertebral corners as well as non-corner lesions in the disc space and lesions in the lateral segments of the thoracic and ...
As for MRI-SIJ, in the absence of a formal definition, we defined structural damage as ≥5 fatty lesions, since this cutoff has been shown to be highly specific for axSpA [14]. The total number of structural lesions (fatty lesions, erosions, bone spurs, ankylosis; range: 0–322) was ...