Sacroiliitis grading (New York criteria)

Last revised by Joel Hng on 27 Nov 2022

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.


  • 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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