Clinical evaluation
The location and behavior of pain, examination findings, functional limitations, and alternative pain generators are considered first.
SI JOINT INJECTION
A targeted approach to suspected sacroiliac joint pain.
An image-guided sacroiliac joint injection can help evaluate whether the SI joint is contributing to a patient’s pain and may provide therapeutic relief in appropriately selected patients. The procedure is most useful when it is part of a broader clinical evaluation rather than a stand-alone test.
UNDERSTANDING SI JOINT INJECTION
The goal is to target the joint that may be generating pain.
Pain around the low back, buttock, pelvis, or hip region can have several possible sources. A targeted SI joint injection can provide useful information when the clinical evaluation raises concern for sacroiliac joint–mediated pain.
Under image guidance, medication is delivered into the sacroiliac joint. Depending on the clinical situation, the procedure may have both diagnostic and therapeutic purposes. The response is interpreted alongside the history, physical examination, and other relevant findings.
THE DIAGNOSTIC & TREATMENT PATHWAY
Start with the clinical picture, then target the joint.
An SI joint injection is one part of a structured evaluation—not proof of a diagnosis by itself.
Image-guided injection
Imaging guidance is used to place the needle accurately within the SI joint before the selected medication is delivered.
Assess the response
The change in the patient’s typical pain and function is considered in the context of the expected medication effect and the clinical question.
Plan the next step
Depending on the response and ongoing symptoms, treatment may include rehabilitation, additional targeted care, or consideration of other options in appropriately selected patients.
WHY IMAGE GUIDANCE MATTERS
Precision helps keep the procedure focused.
The SI joint is a small, deep structure within the pelvis. Fluoroscopic or other appropriate image guidance helps the physician visualize anatomy and guide the needle toward the intended joint.
Image guidance improves technical accuracy, but it does not replace clinical reasoning. The procedure still needs to fit the patient’s symptoms, examination, and overall diagnostic picture.
PATIENT SELECTION
A targeted injection should answer a meaningful clinical question.
Not every patient with pain near the low back or buttock has SI joint–mediated pain. The decision to perform an injection depends on the complete clinical evaluation and whether the result could meaningfully influence treatment.
Clinical fitThe pain pattern and examination should make SI joint involvement a reasonable consideration.
Appropriate targetThe procedure should be directed at the joint when the clinical question specifically concerns the SI joint.
Meaningful responseThe response is interpreted alongside baseline symptoms, function, timing, and the broader clinical picture.
WHAT TO EXPECT
A focused, image-guided outpatient procedure.
Before treatment
Your physician reviews your symptoms, examination, medications, prior treatment, and the reason an SI joint injection is being considered.
During treatment
After positioning and skin preparation, imaging guidance is used to direct the needle to the intended SI joint before medication is delivered.
After treatment
You may be asked to track your usual symptoms and activities so that the timing and degree of response can be assessed as part of your treatment plan.
FREQUENTLY ASKED QUESTIONS
Common questions about SI joint injections.
What is an SI joint injection?
An SI joint injection is an image-guided procedure that places medication into the sacroiliac joint. Depending on the clinical situation, it may be used for diagnostic information, therapeutic relief, or both. Its role should be defined before the procedure so the response can be interpreted appropriately.
How do you know if the SI joint is causing my pain?
No single symptom or imaging finding establishes SI joint–mediated pain. The diagnosis is based on the overall clinical evaluation, including the history and physical examination. A targeted injection may provide additional diagnostic information in appropriately selected patients.
Why does the injection need image guidance?
Image guidance helps the physician visualize the anatomy and direct the needle toward the intended SI joint. The guidance method depends on the procedure and clinical circumstances, but the goal is accurate placement at the intended target.
How long can the relief last?
There is no predictable duration for every patient. The response varies with the underlying condition, medication, and individual factors. A therapeutic response may be temporary, and the duration of benefit should be considered when deciding on subsequent treatment.
What if the injection helps but the pain comes back?
That depends on the degree and duration of benefit, the underlying diagnosis, functional goals, and available alternatives. Persistent or recurrent symptoms may warrant reassessment rather than simply repeating a procedure automatically.
NEXT STEP
Could the SI joint be contributing to your pain?
A focused evaluation can determine whether your symptoms and examination support considering an image-guided SI joint injection and what role it may have in your overall treatment plan.
Request an AppointmentThis page provides general educational information and does not replace an individualized medical evaluation. SI joint injections are not appropriate for every patient with low back, buttock, or pelvic pain. Risks, benefits, alternatives, expected outcomes, and treatment selection depend on the complete clinical picture.