Hip and lower back pain can disrupt nearly every part of your daily routine—from sitting comfortably at your desk to getting a full night’s sleep. For many people, the source of this discomfort isn’t always obvious. You may have tried stretching, rest, or over-the-counter medications without relief, only to find the pain keeps coming back. In many cases, the issue may stem from the sacroiliac (SI) joint—an often-overlooked contributor to chronic pain.

The SI joint plays a crucial role in connecting your spine to your pelvis, helping distribute weight and absorb impact as you move. When this joint becomes inflamed or dysfunctional, it can lead to persistent pain in the lower back, hips, and even the legs. Because these symptoms often mimic other conditions, SI joint problems are frequently misdiagnosed or left untreated.

At Commonwealth Spine & Pain Specialists, SI joint injections are used as a targeted, minimally invasive solution to both diagnose and relieve this type of pain. This guide will walk you through how SI joint injections work, who they’re best suited for, and what you can expect from treatment. By the end, you’ll have a clearer understanding of whether this approach could help you regain comfort and mobility.

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What Causes SI Joint Pain?

The sacroiliac joints are located where the spine meets the pelvis, acting as stabilizers and shock absorbers for the upper body. Although they don’t move as much as other joints, even small disruptions in their function can lead to significant discomfort. SI joint pain often develops gradually, making it difficult to pinpoint the exact cause.

One of the most common contributors is inflammation due to repetitive stress or poor biomechanics. Sitting for long periods, improper posture, and muscle imbalances can all increase pressure on the SI joints. On the other hand, high-impact activities or heavy lifting can also strain the joint, leading to irritation and pain. Injuries such as falls or car accidents may also trigger SI joint dysfunction.

According to the National Institute of Neurological Disorders and Stroke (NINDS), lower back pain is one of the most common causes of disability, and SI joint dysfunction is a contributing factor in many cases. When the joint becomes unstable or inflamed, it can produce symptoms such as sharp pain in the lower back, aching in the hips, or discomfort that radiates down the legs.

Because SI joint pain often mimics conditions like sciatica or herniated discs, it’s important to receive an accurate diagnosis. Identifying the true source of pain ensures that treatment is both effective and appropriate.

How SI Joint Injections Work

SI joint injections are a specialized treatment designed to both diagnose and alleviate pain. The procedure involves injecting a combination of a local anesthetic and a corticosteroid directly into the SI joint.

The diagnostic benefit comes from the anesthetic portion of the injection. If the pain significantly decreases shortly after the injection, it confirms that the SI joint is the source of the discomfort. This helps eliminate uncertainty and guides future treatment decisions.

The therapeutic benefit comes from the anti-inflammatory medication. Corticosteroids work to reduce swelling and irritation within the joint, which can provide longer-lasting relief. Many patients begin to notice improvement within a few days, with reduced pain and increased mobility.

At Commonwealth Spine & Pain Specialists, SI joint injections are performed using imaging guidance to ensure precise placement of the medication. 

In many cases, injections are part of a broader treatment plan. Physical therapy, strengthening exercises, and posture correction can help maintain results and prevent future flare-ups. Combining these approaches often leads to more sustainable pain relief.

Who Is a Good Candidate for SI Joint Injections?

Not all lower back pain originates from the SI joint, which is why careful evaluation is essential. Individuals who experience persistent pain in the lower back, buttocks, or hips may be candidates for this treatment—especially if the pain worsens with standing, walking, or climbing stairs.

People who have not found relief through conservative treatments such as rest, medication, or physical therapy may benefit from SI joint injections. Additionally, those recovering from injuries or dealing with joint instability may find this option particularly helpful.

Certain life events and conditions can also increase the likelihood of SI joint dysfunction. Pregnancy, for example, can alter joint stability, while aging can lead to degeneration of the joint over time. Repetitive strain from daily activities may further contribute to ongoing discomfort.

At Commonwealth Spine & Pain Specialists, each patient undergoes a comprehensive evaluation to determine whether SI joint injections are the right choice. By considering medical history, symptoms, and lifestyle factors, the team develops personalized treatment plans that address both immediate pain and long-term well-being.

What to Expect Before, During, and After Treatment

Understanding the treatment process can help you feel more confident about your decision. Before the procedure, your provider will review your symptoms and may recommend imaging tests to confirm the diagnosis.

During the injection, you’ll be positioned comfortably while the provider uses imaging technology to guide the needle into the SI joint. The procedure typically takes less than 30 minutes and is performed on an outpatient basis.

After the injection, you may experience immediate relief due to the anesthetic. This may wear off temporarily before the corticosteroid begins to take effect, which usually occurs within a few days. Most patients are able to resume normal activities shortly after the procedure, although strenuous activity may be limited for a short time.

With expert guidance and a comprehensive approach, SI joint injections can be an effective step toward reducing pain and improving mobility.

Frequently Asked Questions About SI Joint Injections

What does an SI joint injection treat?
 SI joint injections are used to treat inflammation and pain originating from the sacroiliac joint. They can help relieve lower back, hip, and leg pain while also confirming the source of discomfort.

How long do SI joint injections last?
 Pain relief can last from several weeks to several months. Results vary depending on the individual and whether additional therapies are used alongside the injection.

Are SI joint injections painful?
 Most patients experience minimal discomfort. A local anesthetic is used to numb the area, making the procedure relatively quick and tolerable.

How quickly will I feel relief?
 Some patients feel immediate relief from the anesthetic, while the anti-inflammatory effects may take a few days to fully develop.

Can I return to normal activities after the procedure?
 Yes, most patients can resume light activities the same day. Your provider will give specific recommendations based on your condition.

Hip and lower back pain can significantly impact your quality of life, especially when the root cause isn’t immediately clear. When the sacroiliac joint is involved, traditional treatments may not provide lasting relief. SI joint injections offer a targeted, minimally invasive solution that addresses both diagnosis and treatment in one procedure.

Commonwealth Spine & Pain Specialists is dedicated to helping patients find effective, long-term relief through advanced pain management techniques. By combining precise diagnostics with personalized care, the team ensures that each patient receives the support they need to move forward with confidence.

If you’re dealing with persistent hip or lower back pain, it may be time to explore a more targeted solution. SI joint injections can help identify the source of your pain while providing meaningful relief that allows you to get back to your daily activities.

At Commonwealth Spine & Pain Specialists, we take a patient-centered approach to care, ensuring that every treatment plan is tailored to your unique needs. Our experienced team is here to guide you through every step of the process from diagnosis to recovery.

Call us today at (804) 719-4273 to schedule your consultation. Let us help you take the next step toward lasting pain relief and improved mobility.