Sacroiliac (SI) joint injections help both diagnose and treat pain in the lower back and buttocks caused by inflammation in one or both SI joints: the joints that connect the spine to the pelvis. This pain may stem from conditions like arthritis, injury, pregnancy, or joint instability.
During the procedure, a mix of local anesthetic and corticosteroids is injected directly into the joint to reduce inflammation and relieve pain. If the injection helps, it confirms the SI joint as the source of the discomfort. Relief can last for several weeks or even months.
The procedure is quick, usually under 10 minutes, and done with live X-ray guidance to ensure accuracy. Most patients go home the same day and can return to regular activities within 24 hours. Some soreness at the injection site is normal and usually improves with ice.
SI joint injections can be repeated a few times per year if needed and are often most effective when paired with physical therapy to address the root cause of pain. Side effects are rare but may include mild swelling, temporary flushing, or elevated blood sugar in diabetic patients.
