Osteitis Condensans illi (Asymmetric presentation with preserved joint space)

Osteitis condensans ilii is a benign condition found more often in women then in men. It is essentially a radiologic diagnosis. A bilateral and relatively symmetrical area of sclerosis is seen on the iliac side of the sacroiliac joint, and the sclerotic area is typically triangular in shape. The importance of recognizing this entity is that it may potentially be confused with the sacroiliitis found in ankylosing spondylitis and other inflammatory conditions. Unlike sacroiliitis, however, the articular margins are intact and the joint space is preserved.

 Findings:

- Bilateral symmetric sclerosis of the iliac side of the sacro-iliac joint

-The sclerosis appears triangular with the base located inferiorly
- Erosions of the SI joint are absent

 Osteitis condensans ilii and and osteitis pubis are two conditions occurring predominantly as complications of pregnancy. In the former, a well-defined triangular sclerosis occurs on the ilac aspect of the sacroiliac joint, with bone eburnation on the inferior portion of the bone. A \"low back\" syndrome or \"fibrositis\" syndrome may be recognized in some patients. Osteitis condensans ilii may be related to mechanical stress across the sacroiliac joint and increased vascularity in pregnancy, although other causes have also been suggested.