Sacroiliac (SI) Joint
From the plain-English glossary.
Definition
The load-transfer joints between the spine's base and the pelvis — strong, slightly mobile, and a frequent source of one-sided low-back/buttock pain.
Why it matters to you
Frequently missed because it isn't technically the spine. Cluster testing finds it; specific care suits it.
This page is education, not medical advice for your specific situation — an examination is how care decisions get made. If you may be experiencing an emergency, call 911. Full medical disclaimer.
In pain right now? Acute patients get priority scheduling. Call and tell us what’s going on — same-week appointments are usually available.
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