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New York sacroiliitis grading. Grade 0 is normal. (A) Grade 1—suspicious changes; (B) Grade 2—minimum abnormality (small localized areas with erosion or sclerosis, without alteration in the joint width); (C) Grade 3—unequivocal abnormality (moderate or advanced sacroiliitis with erosions, evidence of sclerosis, widening, narrowing, or partial ankyloses); (D) Grade 4—severe abnormality (total ankyloses).
