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Table 1 The modified "New-York-Criteria" [1,5].

From: Pitfalls and complications in the treatment of cervical spine fractures in patients with ankylosing spondylitis

Clinical Criteria:

Lower back pain and stiffness for more than 3 months with improvement after exercise, but not with rest

Reduced motility of the lumbar spine in the sagittal and frontal axis

Restriction of the chest expansion (age and gender related)

Radiological Criteria:

Sacroiliitis at least grade 2 bilateral or grade 3–4 ipsilateral