Conventional radiography is a well-established method for detecting permanent damage (structural changes) in the sacroiliac joints.
For all forms of axSpA, the degree of severity (grading) is classified according to the New York criteria for ankylosing spondylitis in 5 grades: doi:10.1002/art.1780270401.
Grade 0: Normal findings.
Grade 1: Suspicious changes.
Grade 2: Minimal abnormality with small areas of erosions or sclerosis without alteration in the joint width.
Grade 3: Unequivocal abnormality - moderate or advanced sacroiliitis consisting of erosion, sclerosis, widening, narrowing, and/or partial joint fusion (ankylosis).
Grade 4: Severe abnormality in the form of total ankylosis.
Grade 0
Normal findings
Grade 1
Suspicious changes at the left SIJ in the form of slightly irregular joint facets.
Grade 2
Minimal abnormalities in the form of small erosion and slightly condensed bone (sclerosis)(white arrow).
Grade 3
Manifest abnormalities in the form of erosion and sclerosis in addition to widening of the middle part of both SIJs, especially on the left side.
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