About Sacroiliac Joint Injection
The sacroiliac joints sit on each side of the low back, where the base of the spine meets the pelvis. They move only slightly but carry large loads with walking, running, and lifting. Irritation or arthritis here can cause pain in the buttock, low back, or groin, sometimes spreading into the thigh.
Many conditions mimic SI joint pain, so an injection has two jobs. If your usual pain eases soon after the joint is numbed, it confirms the diagnosis. The steroid can then reduce inflammation for a longer period.
Dr. Chen uses image guidance so the medication goes into the joint rather than the surrounding tissue. If relief is strong but does not last, joint denervation of the nerves supplying the SI joint may be considered.
What happens during treatment
- 1.
Dr. Chen reviews your history and performs a series of exam tests that stress the SI joint.
- 2.
You lie face down, and the skin over the joint is cleaned and numbed.
- 3.
Using imaging guidance, a thin needle is placed into the joint and the medication is injected.
- 4.
You walk around and note how your usual pain feels, then go home the same day.
Who may be a good candidate
- People with one-sided low back or buttock pain that is worse with standing on one leg, climbing stairs, or rolling in bed.
- People whose exam suggests SI joint pain and who have not improved enough with rehab.
- People with inflammatory arthritis, prior spinal fusion, or pregnancy-related pelvic pain that persists after delivery.
Recovery
Most people return to normal activity the next day. The numbing medication wears off within hours, and the steroid usually starts to help within several days to two weeks. We use that period to strengthen the hips and trunk, which helps stabilize the pelvis and protect against future flares.
Risks and limits
Possible side effects include temporary soreness, a brief increase in pain, facial flushing, trouble sleeping, and higher blood sugar in people with diabetes. Temporary leg numbness or weakness can occur if the anesthetic spreads, so bring a driver. Infection and bleeding are rare. Steroid injections are limited in how often they can be given, and they do not address the underlying cause without rehab.
What to expect at your visit
- 1.
We listen first
Your visit opens with a real conversation: how the problem started, what you have already tried, and the activity you want back.
- 2.
Exam and in-office ultrasound
A hands-on exam, then ultrasound at the exam table, often while you move, so your physician can see the tendon, joint, or nerve involved.
- 3.
A clear diagnosis and plan
You leave knowing what is wrong and what your options are, from strength-based rehab to procedures, and why we recommend each one.
- 4.
Treatment and follow-through
Most procedures happen here in the office. We coordinate with your physical therapist and check progress against the goals you set.
Questions about SI Joint Injection
- How do I know if my pain comes from the SI joint?
- No single test is perfect. A combination of exam findings and a clear response to a numbing injection is the most reliable way to confirm the SI joint is the pain source.
- What if the SI joint injection only helps for a short time?
- Short-lived but strong relief suggests the diagnosis is right. Options then include a longer-lasting nerve treatment such as joint denervation, along with a focused hip and trunk strengthening program.
- Can I exercise after a sacroiliac joint injection?
- Rest for the remainder of the day, then return to walking and light activity. Most people can resume their rehab and training program within a few days.