Renson T, Depicker A, De Craemer AS, et al. - This study was attempted to assess the association between pregnancy/delivery and pelvic stress through a prospective study with repeated MRI. Researchers included 35 women who had undergone a baseline MRI-SIJ within the first 10 days after giving birth. After 6 months, MRI was repeated and, whether positive for sacroiliitis according to the Assessment of SpondyloArthritis International Society definition, after 12 months. In women immediately postpartum, they found a surprisingly high prevalence of sacroiliac bone marrow oedema. This study's findings reveal a requirement for a waiting period of at least 6 months to conduct an MRI-SIJ in postpartum women with back pain. This research also underscores the utility of interpreting MRI-SIJ findings in the appropriate clinical context.