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Sacroiliitis grading

Sacroiliitis grading can be achieved using plain films according to the New York criteria 4.

  • grade 0: normal
  • grade I: some blurring of the joint margins - suspicious
  • grade II: minimal sclerosis with some erosion
  • grade III:
    • definite sclerosis on both sides of joint 5
    • severe erosions with widening of joint space with or without ankylosis
  • grade IV: complete ankylosis

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