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The New York diagnostic criteria for sacroiliitis
| Grade 0 | No abnormalities (normal sacroiliac joints) |
| Grade 1 | Suspected abnormalities (blurred joint margins) |
| Grade 2 | Minimal abnormalities (single erosions and juxta-articular sclerosis) |
| Grade 3 | Advanced abnormalities (distinct juxta-articular sclerosis, multiple erosions with widening of the joint space, possible partial ankylosis) |
| Grade 4 | Complete ankylosis |
