Sacroiliitis

Sacroiliitis
Magnetic resonance images of sacroiliac joints. Shown are T1-weighted semi-coronal magnetic resonance images through the sacroiliac joints (a) before and (b) after intravenous contrast injection. Enhancement is seen at the right sacroiliac joint (arrow, left side of image), indicating active sacroiliitis. This patient had psoriatic arthritis.
SpecialtyRheumatology 
Diagnostic methodX-ray, MRI

Sacroiliitis is a condition caused by inflammation within the sacroiliac (SI) joint, where the base of the spine (called the sacrum), and the pelvis (called the ilium), connect. The term "sacroiliitis" combines the words sacrum, ilium, and the Latin term "itis", which denotes inflammation.

Inflammation in the SI joint can develop through several different processes. It is a feature of spondyloarthropathies, such as axial spondyloarthritis (including ankylosing spondylitis), psoriatic arthritis, reactive arthritis or arthritis related to inflammatory bowel diseases, including ulcerative colitis or Crohn's disease. It is also the most common presentation of arthritis from brucellosis. Problems with the SI joint are in some cases caused by injury in childbirth, other injury, a congenital condition, or a viral or bacterial infection.

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