Sacroiliitis grading can be achieved using plain radiographs according to the New York criteria 1,2. A patient is considered positive for radiographic sacroiliitis if the score is greater than or equal to grade II bilaterally or greater than or equal to grade III unilaterally 3.
Classification
grade 0: normal
grade I: suspicious changes (some blurring of the joint margins)
grade II: minimum abnormality (small localized areas with erosion or sclerosis, with no alteration in the joint width)
grade III: unequivocal abnormality (moderate or advanced sacroiliitis with erosions, evidence of sclerosis, widening, narrowing, or partial ankylosis)
grade IV: severe abnormality (complete ankylosis)
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