Home▸Articles▸Spinal Epidural/Facet Injection

Understanding Sacroiliac Joint Injections: A Diagnostic Procedure

Sacroiliac joint injections are a diagnostic and therapeutic tool used to identify the source of low back pain.

mysimulator teamUpdated June 2026≈ 3 min read▶ Open the simulation

What Are Sacroiliac Joint Injections?

Sacroiliac (SI) joint injections are a diagnostic and therapeutic procedure used to determine if the sacroiliac joints are the source of low back or leg pain. The injection involves placing anesthetic medication into the SI joint, which can help relieve symptoms by numbing the area around the joint.

The procedure is often performed under fluoroscopy (a type of X-ray) guidance to ensure accurate needle placement and minimize the risk of complications.

Why Are Sacroiliac Joint Injections Performed?

SI joint injections are typically used when patients experience chronic low back pain that is localized in the sacroiliac region. The injection can help diagnose whether SI joint dysfunction is causing the pain, and it may also provide temporary relief to assess if further treatment is necessary.

If the injection provides significant pain relief, it suggests that the SI joints are indeed the source of the patient’s discomfort, which can guide future treatment decisions.

live demo · related simulation● LIVE

The Procedure Behind Sacroiliac Joint Injections

During an SI joint injection, a healthcare provider uses fluoroscopy to visualize the sacroiliac joints and guide a needle into the joint space. A local anesthetic is then injected to numb the area around the joint, and sometimes corticosteroids are added for longer-term pain relief.

The procedure is generally well-tolerated, with patients experiencing only minor discomfort during the injection itself.

Benefits and Considerations

Sacroiliac joint injections can provide both diagnostic and therapeutic benefits. They help in identifying the source of pain and can offer temporary relief to allow for more effective long-term treatment strategies.

However, it is important to consider that SI joint injections are not a cure but rather a tool to guide further management of chronic pain conditions.

Frequently asked questions

What symptoms might indicate the need for an SI joint injection?

Symptoms such as low back pain, buttock pain, or leg pain that is localized in the sacroiliac region and does not respond to conservative treatments may warrant an SI joint injection.

How long do the effects of an SI joint injection typically last?

The effects of an SI joint injection can vary, but they often provide temporary relief that lasts for several weeks or months. Some patients may experience prolonged pain relief, while others might need additional injections.

Are there any risks associated with sacroiliac joint injections?

Potential risks include infection, bleeding, nerve damage, and allergic reactions to the injected medications. However, these complications are rare when performed by a skilled healthcare provider.

What happens if an SI joint injection does not relieve my pain?

If an SI joint injection does not provide relief, it may indicate that the SI joints are not the primary source of your pain. Further diagnostic tests or alternative treatments might be considered to identify and address the underlying cause.

Try it live

Everything above runs in your browser — open Sacroiliac Joint Injection Diagnostic Simulator and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Sacroiliac Joint Injection Diagnostic Simulator simulation

What did you find?

Add reproduction steps (optional)