The MRI SIJ findings in postpartum patients with buttock/pelvic pain remain stable in a 7 year follow up study. They rarely develop classical MRI features of axial SpA (i.e. erosion, fat > 1 cm in depth, backfill and ankylosis) or are diagnosed as axial SpA within an 8-year… https://t.co/8M0FP65KPS https://t.co/k1ruzjC7Zy