Nerve Blocks & Injections

Sacroiliac Joint Injections

Corticosteroid and anesthetic delivered directly into the SI joint, confirming and treating a commonly overlooked source of lower back and buttock pain.

Nerve

Procedure Overview

Pain that sits in the lower back and spreads into the buttock, and is aggravated by asymmetric loading or prolonged sitting, often points to the sacroiliac joint. This joint, which connects the base of the spine to the pelvis, is a frequently overlooked source of lower back pain. It does not show up clearly as a problem on standard imaging, which is why it is often missed.

Treatment Purpose

Sacroiliac joint injections deliver corticosteroid and local anesthetic directly into the SI joint. The procedure both confirms the SI joint as the source of pain and reduces the inflammation causing it. A positive response also helps determine whether SI joint radiofrequency ablation is appropriate for longer-lasting relief.

Appropriate Conditions

Sacroiliac joint dysfunction and inflammation
Lower back and buttock pain
Post-partum SI joint pain
Degenerative sacroiliitis
Ankylosing spondylitis-related SI joint pain

Patient Considerations

That is exactly what this procedure helps determine. The diagnostic component of the injection is built into the process, if you experience significant pain reduction after the injection, it confirms the SI joint as the source. You leave with both relief and a clearer diagnosis, which helps guide what happens next.

Treatment Process

The procedure takes 20 to 30 minutes under fluoroscopic or ultrasound guidance. You lie face down while a thin needle is inserted into the SI joint. Contrast dye confirms correct placement before corticosteroid and anesthetic are injected. You return home the same day.

Frequently Asked Questions

How long does relief last?

Relief typically lasts weeks to months. Patients who respond well may be candidates for SI joint radiofrequency ablation for longer-lasting relief.

What are the next steps after a positive response?

A strong positive response may qualify you for SI joint radiofrequency ablation, which provides longer-lasting relief by treating the nerves supplying the joint.

What are the risks?

Very low risk. Rare complications include infection, a temporary pain flare, or mild bleeding.

Medical disclaimer: This page provides general information and is not medical advice. It does not replace an evaluation by a qualified physician. Talk with a doctor about your specific condition and treatment options. If you are experiencing a medical emergency, call 911.

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