How common are MRI T2 hyperintensity findings in mechanical vs. inflammatory sacroiliitis in the general population?
This is a great question, though the available spondylitis-focused research doesn't provide specific population-level prevalence numbers comparing mechanical vs. inflammatory sacroiliitis on MRI T2 findings.
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How common are MRI T2 hyperintensity findings in mechanical vs. inflammatory sacroiliitis in the general population?
This is a great question, though the available spondylitis-focused research doesn't provide specific population-level prevalence numbers comparing mechanical vs. inflammatory sacroiliitis on MRI T2 findings.
What is well understood is that MRI is particularly valuable for distinguishing between the two, but it's not always straightforward. Here's why: - Inflammatory sacroiliitis in spondylitis shows up as bone marrow edema (BME), synovitis, and enthesitis on MRI
- Mechanical changes from wear, tear, or aging can look very similar on MRI scans
- MRI is not highly specific — meaning it can flag inflammation that isn't necessarily spondylitis-related
- It can take over a year for inflammatory swelling to even become visible on MRI
- MRI can also return negative results even when inflammatory sacroiliitis is present
A key distinguishing clinical clue is the *type* of back pain. Inflammatory back pain typically improves with movement and worsens with rest, while mechanical pain does the opposite. A rheumatologist can combine imaging with clinical history for a more accurate picture.
May 4
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