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Why Does My MRI Look Normal When My SI Joint Hurts So Much?

Writer: Jason Winkelmann
Jason Winkelmann
2 minutes ago
3 min read

A normal MRI does not rule out SI joint pain, because mechanical SI problems are mostly about how the joint is loaded and controlled, not about visible damage. Many lumbar scans stop above the joint, and even scans focused on it can look normal in people whose joint is proven painful by a numbing injection.


If your scan came back normal and someone implied the pain must be mild or stress-related, that is a deeply frustrating thing to hear while you are still hurting. A normal image and real pain can both be true.



The Mechanism


Think of an MRI as a photograph. It shows structure at one moment, lying still. SI joint pain is often a problem of the joint in motion, and of the muscles that control it, which a photograph cannot capture. The joint's stability depends on force closure, the active compression supplied by muscles and ligaments during movement. A joint can be strained by poor muscle timing while its bones, cartilage, and ligaments look perfectly ordinary.



The research backs this up directly. A review in the International Journal of Spine Surgery states that specific imaging of the SI joint has not been shown to correlate accurately with SI joint pain. Degenerative changes can often be seen in people with no symptoms, and joints that are proven inflamed and painful by anesthetic block often appear normal on imaging. There is a second, simpler reason as well. Routine X-rays and most MRI scans of the low back look at the lumbar spine and often stop above the SI joint, so the joint may never have been closely examined.



None of this means MRI is useless. It is highly sensitive for one specific thing, sacroiliitis from inflammatory conditions like spondyloarthritis, and CT and MRI are valuable for excluding fracture, infection, and tumor. What it is not good at is detecting the mechanical dysfunction that accounts for most SI joint pain.



When It's Something More Serious


Numbness in the groin or inner thighs, changes in bladder or bowel control, progressive leg weakness, fever with back pain, or pain after significant trauma needs urgent evaluation. Back and buttock pain with morning stiffness lasting more than 30 minutes that improves with movement, especially before age 45, warrants rheumatology assessment, and a normal scan does not close that question when symptoms persist.



How This Gets Addressed


Because imaging rarely settles it, the work begins with a hands-on exam that tests the joint's response to loading and provocation, then treats what the exam finds.



Chiropractic care addresses the SI joint directly, with techniques directed at the joint rather than the lumbar spine in general.


Massage Therapy and Dry Needling release the guarded muscles around it.


Physical Therapy completes the picture by retraining the muscles that control the joint, which is what prevents the pain from returning


Naturopathic Medicine addresses the inflammatory and metabolic factors that contribute to recurrent joint irritation.


You can learn more about our full approach to sacroiliac joint pain here.


Most people find that once the true source is examined and treated, their symptoms begin to follow a logic they can finally understand, though a joint that has been irritated for years may always respond to overload.



Written By:

Dr. Jason Winkelmann

Naturopathic doctor, Chiropractor, Chronic Pain Specialist, and Educator



Frequently Asked Questions


Should I get a diagnostic SI joint injection?

That is a decision to make with your physician. The injection uses imaging guidance to place numbing medication into the joint, and a large drop in pain, commonly more than 75 percent for a short window, is taken as confirmation. It carries a meaningful false-positive rate, so many clinicians use it only after conservative care and a thorough exam point toward the joint.

Yes. A disc finding on a scan does not prove that the disc is the source of your pain, and both can contribute at once. The question is whether your symptoms and exam match the disc, the joint, or both.

No. A normal scan means no structural damage visible on that scan. It says nothing about how well the joint is controlled when you move, which is where many SI problems originate.


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