A sacroiliac (SI) joint injection is used to diagnose or relieve pain in the lower back, buttocks, or hips when the SI joint—connecting the lower spine to the pelvis—is suspected to be the source. The injection helps reduce inflammation and ease discomfort. Studies suggest that up to 30% of back pain may come from the SI joint.

This procedure may help with persistent lower back pain near the SI joint, pain that spreads to the buttocks, hips, or groin, and difficulty standing, sitting for long periods, or climbing stairs. Using live X-ray or ultrasound guidance, a doctor carefully injects a local anesthetic—and sometimes a steroid—directly into the joint. Often, two injections are performed to confirm the diagnosis, offering temporary relief while identifying whether the SI joint is the actual source of pain.

Alternative treatments include physical therapy to improve strength and flexibility, anti-inflammatory medications, and other types of injections such as prolotherapy or platelet-rich plasma (PRP). In more severe cases, surgical options like SI joint fusion may be considered.

Though generally safe, SI joint injections do carry some risks. These include local pain or soreness, infection or bleeding at the injection site, accidental irritation of nearby nerves, and, in rare cases, steroid-related side effects such as elevated blood sugar.

If the SI joint is suspected as the cause of pain, a diagnostic injection is often the first step to confirm it. Early evaluation is key to finding the most effective treatment. Talk to our team to explore the best options for your care.