Osteitis condensans ilii
- Benign sclerosis of the iliac side of the sacroiliac joints
- Bilaterally symmetric
- Usually found in young females who have had several children but also may be seen in males
- Related to remodeling of bone following stress across the sacroiliac joint
- Clinical findings
- Rarely symptomatic but may be mildly painful
- May have morning stiffness and polyarthralgia
- Imaging findings
- Sclerosis is frequently triangular in shape with the base pointing inferiorly
- Not to be confused with a sacroiliitis
- Sacroiliac joint is intact in osteitis condensans ilii
- Sclerosis involves only iliac side of joint in osteitis condensans ilii
- Outer margin of sclerosis is usually well-defined
- If in doubt, oblique views of the SI joints will show the joint to be intact and the sclerosis on only iliac side
- May spontaneously resolve