Oblique coronal T1-weighted MRI of SIJ of a 47-year-old woman with mechanical low back pain (no SpA) and childbirth history: two children, one of which delivered naturally, the other by C-section. The last delivery was 22 years and 8 months ago. Image depicts substantial subchondral sclerosis (arrows) in the upper quadrant of both SIJ in the os ilium, representing a sclerosis score of 2 on the right side and 3 on the left side, respectively. C-section cesarean surgery, SIJ sacroiliac joint, SpA spondyloarthritis