Condition guide
Sacroiliac Joint Pain
Pain near the joint connecting the pelvis and lower spine, often felt in the buttock or low back.
Overview
The sacroiliac joints connect the base of the spine to the pelvis on each side and transfer substantial force between your upper body and your legs during walking, standing, and lifting. When one of these joints becomes irritated or its mechanics change, the result is often pain felt below the beltline, in the buttock, or in the low back on one side.
Sacroiliac joint pain is easy to mistake for other problems. Its symptoms overlap with lumbar spine conditions and hip disorders, and it is frequently overlooked after spine surgery or during evaluation of persistent low-back pain. Recognizing it requires specific examination maneuvers and, at times, a diagnostic injection.
Symptoms
- Pain below the beltline, often on one side
- Buttock pain that may extend down the back of the thigh
- Discomfort with stairs, hills, or single-leg standing
- Pain when transitioning from sitting to standing or rolling in bed
- Stiffness or aching after sitting for long periods
- Tenderness over the joint at the back of the pelvis
Possible causes
Joint irritation can follow altered mechanics, a fall or direct impact, pregnancy-related ligament changes, arthritis, leg-length differences, or prior lumbar spine surgery. In some cases the joint becomes painful after a period of unusual loading, such as a new activity or an injury, without a single identifiable event.
How it is diagnosed
Diagnosis starts with the symptom pattern and a series of specific provocative maneuvers that stress the joint. Because no single test is conclusive, several are combined. When the picture suggests the sacroiliac joint, an image-guided diagnostic injection can confirm it: meaningful relief after the injection supports the joint as the pain source.
Treatment options
Initial care often includes rehabilitation focused on pelvic and core stability, movement strategies, and activity modification. When the joint is confirmed as a pain source and conservative measures are not enough, image-guided sacroiliac joint injections can reduce inflammation and pain. In selected cases, additional procedural options are discussed.
When to see a specialist
An evaluation can help when persistent low-back or buttock pain has not improved with conservative care, when the pain source remains unclear despite prior treatment, or when pain follows pregnancy, a fall, or spine surgery. One-sided pain below the beltline is a particularly common presentation.
Common questions
Frequently asked questions
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This information is educational and does not replace an individual medical evaluation. If you have a medical emergency, call 911.