Lower back pain affects millions of people, and for many, the source lies in the sacroiliac joint. This joint connects your spine to your pelvis and can become inflamed or dysfunctional, leading to pain in your lower back, buttocks, or legs. When you experience sacroiliac joint pain or sacroiliitis, your doctor may recommend a treatment option called a sacroiliac joint injection.
Sacroiliac joint injections deliver medication directly into or around your SI joint to reduce inflammation and provide pain relief, while also helping doctors confirm if the joint is the actual source of your discomfort. These injections typically combine corticosteroids with anesthetic medications. The procedure takes less than 30 minutes and can offer immediate relief for some patients.
Understanding how SI joint injections work and what to expect can help you make informed decisions about managing your sacroiliac joint dysfunction. This article covers the basics of these injections, walks you through the procedure and techniques doctors use, and answers common questions about recovery and results.
Sacroiliac joint injections serve both as a tool to identify the source of your pain and as a treatment to reduce discomfort in your lower back and pelvis. These injections use medication to address inflammation and determine whether your SI joint is causing your symptoms.
SI joint injections deliver anti-inflammatory medication and anesthetic directly into or around your sacroiliac joint. The main purpose is to reduce pain in your lower back, buttocks, or upper leg that comes from sacroiliac joint dysfunction or sacroiliitis.
The benefits of these injections include:
Many patients experience pain relief that lasts for weeks or months after the procedure. This relief gives you the chance to work on strengthening exercises and other treatments that support long-term recovery. The injection takes less than 30 minutes to complete in an outpatient setting.
Your doctor may recommend an SI joint injection when you show positive responses to specific physical tests that move your SI joint in different directions. You might be a candidate if you have ongoing low back pain that does not respond to basic treatments like rest or medication.
Common signs that suggest you need this procedure include pain in your lower back or buttocks that worsens when you climb stairs, stand from sitting, or put weight on one leg. The pain might also spread down your leg, similar to sciatica.
You should not receive this injection if you are pregnant, have an active infection, certain blood disorders, specific types of diabetes, or cancer in the treatment area.
Diagnostic SI joint injections help your doctor confirm whether your sacroiliac joint is causing your pain. When the anesthetic in the injection temporarily blocks pain signals, it shows that your SI joint is the problem source. This information guides your treatment plan going forward.
Therapeutic injections focus on providing longer-term pain relief through corticosteroids that reduce inflammation. These injections may be given as standalone treatment or combined with other therapies.
Sometimes you receive both benefits from a single injection. The anesthetic provides immediate diagnostic information while the corticosteroid offers therapeutic pain relief over time. Your doctor uses the results to determine if additional injections or other treatments like radiofrequency ablation would help your sacroiliac joint pain.
Sacroiliac joint injections involve precise needle placement into the joint space using imaging guidance, with different injection types serving either diagnostic or therapeutic purposes. Most procedures take less than 30 minutes and use fluoroscopy or CT imaging to ensure accuracy.
Your doctor will position you face-down on a table for the injection procedure. The medical team uses fluoroscopy or CT imaging to guide the needle into your sacroiliac joint with accuracy.
The procedure starts with skin cleaning and local anesthetic to numb the area. Your doctor inserts a 22-gauge needle through the skin, aiming for the lower part of the joint space. The needle often hits bone initially, requiring small adjustments to enter the joint.
Imaging techniques include:
Once the needle enters the joint, your doctor injects contrast dye to confirm proper placement. The contrast dye shows up on imaging and spreads through the joint space if positioned correctly. After confirmation, the medication is injected into the joint.
Intra-articular injections place medication directly inside the joint space. These injections target the joint itself and require precise needle placement confirmed by contrast dye spread.
Periarticular injections deliver medication around the joint rather than inside it. Your doctor may choose this approach if the joint space is difficult to access or if surrounding tissues contribute to your pain.
Diagnostic injections use local anesthetic alone to determine if your sacroiliac joint causes your pain. If you experience significant pain relief after the injection, your sacroiliac joint dysfunction is likely the source of your symptoms.
Therapeutic injections combine local anesthetic with corticosteroid medication. The steroid injection reduces inflammation in the joint and can provide longer-lasting pain relief than diagnostic injections alone. Most therapeutic injections contain 1-3cc of medication.
Some patients feel immediate pain relief from the local anesthetic within minutes of the injection. This quick response helps confirm sacroiliac joint dysfunction as the pain source.
The steroid injection takes longer to work, usually showing effects within 3-7 days. Maximum pain relief typically occurs 1-2 weeks after the procedure as inflammation decreases.
Pain relief duration varies by person. Some patients experience relief for several weeks, while others benefit for months. The injection may need to be repeated if pain returns.
Your doctor may recommend physical therapy alongside injections to improve long-term outcomes. Combining treatments addresses both inflammation and mechanical problems in the joint.
Common side effects include:
Serious complications are rare but can include infection, nerve damage, or allergic reactions to the medication. Bleeding risk increases if you take blood thinners.
Steroid injection side effects may include facial flushing, elevated blood sugar levels in diabetics, or temporary mood changes. These effects usually resolve within a few days.
If injections provide only temporary relief or stop working, your doctor may suggest radiofrequency ablation (RFA). This procedure uses heat to disrupt nerve signals from the joint. Radiofrequency denervation treats the nerves around the sacroiliac joint rather than the joint itself.
RFA may provide pain relief lasting 6-12 months or longer. Your doctor performs diagnostic nerve blocks before RFA to confirm you will benefit from the procedure.
Most patients experience only mild discomfort during the injection itself, and pain relief can begin within days. The procedure takes about 15 minutes, though you'll need to plan for additional monitoring time afterward.
The injection itself causes slight pressure or discomfort, but the local anesthetic numbs the area and minimizes pain. You may feel a brief stinging sensation when the numbing medicine is first applied to your skin.
During the injection, you might feel some pressure as the needle enters the joint. Most patients describe this as tolerable rather than painful.
After the procedure, your injection site may become sore once the numbing medicine wears off. This temporary soreness typically lasts a few hours and can be managed with over-the-counter pain medication if needed.
You remain awake during the procedure. The doctor uses only a local anesthetic to numb the skin and tissue around your SI joint.
Sedation is not typically needed because the procedure is quick and causes minimal discomfort. If you're particularly anxious about the injection, talk to your doctor beforehand about your concerns.
You can usually drive yourself home after the procedure unless your doctor decides to use sedation in your specific case.
You may feel immediate but temporary relief from the local anesthetic used during the injection. This quick relief helps confirm that your SI joint is the source of your pain.
The steroid medication takes a few days to start working as it reduces inflammation in the joint. Your pain relief will gradually improve over this time.
The duration of relief varies from person to person. Some patients experience relief for weeks or months, while others may need repeat injections to maintain pain control.
The most common side effect is temporary soreness at the injection site. This soreness usually resolves within a day or two.
Some patients experience a temporary increase in pain before the steroid begins to work. This is normal and should improve within a few days.
Rare but serious risks include infection, bleeding, nerve damage, or allergic reactions to the medication. Contact your doctor immediately if you develop fever, severe pain, numbness, weakness, or signs of infection like redness and swelling.
You can return to your normal activities as tolerated after the procedure. There are no major restrictions for most patients.
Avoid strenuous activities or heavy lifting for the rest of the day after your injection. You can gradually increase your activity level over the next few days based on how you feel.
Your doctor may recommend starting or continuing physical therapy to help strengthen the muscles around your SI joint. This can improve your long-term results.
If your first injection doesn't provide adequate relief, your doctor may recommend a second injection. Some patients need multiple injections for better results.
Physical therapy and exercise programs can help strengthen your core and improve joint stability. Your doctor may refer you to a physical therapist who specializes in SI joint problems.
Other treatment options include radiofrequency ablation, which uses heat to reduce pain signals from the joint. In severe cases that don't respond to other treatments, your doctor may discuss surgical options like SI joint fusion.
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