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By Mayo Clinic staffA wide range of factors or events may cause sacroiliitis:
- A traumatic injury or sudden impact, such as a motor vehicle accident or a fall, affecting your spine, lower back, pelvis or buttocks
- Spondyloarthropathies, which include ankylosing spondylitis, arthritis associated with psoriasis and others
- Degenerative arthritis, also called osteoarthritis of the spine, causing degeneration of the sacroiliac joints, which can cause mild inflammation and pain
- Pregnancy, because the pelvis must stretch to accommodate childbirth
- Infection of the sacroiliac joint, which may result from a number of infections