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I am trying to figure out what's causing my pain. It's either something in my low back or sacroiliac joint. The pain is on the right side right over the dimple in my low back area. Would an X-ray help show problems with my sacroiliac joint?

X-rays can show narrowing of the sacroiliac (SI) joint. This joint is subject to arthritis just like any other synovial joint. Narrowing of the joint space points to age-related degenerative changes.

The problem with these findings is that such changes can be seen in any patient over 30 years old. Such changes aren't always linked to arthritis. Patients can have severe arthritic changes and have no pain. Others have no changes and severe pain.

X-rays can also show bone spurs, osteoporosis, or other changes in the bone itself. It can't always show infection, inflammation, or instability. Doctors rely on other imaging and clinical tests to rule out more serious causes of SI pain.

Reference: 

Jacob M. Buchowski, MD, MS, et al. Functional and Radiographic Outcome of Sacroiliac Arthrodesis for the Disorders of the Sacroiliac Joint. In The Spine Journal. ????? 2005. Vol. 5. No. ????? Pp. 520-528.

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