Modified New York criteria for ankylosing spondylitis (reference: van den Linden, 1984). Definite diagnosis if radiological changes (section 4) and at least one clinical item (section 1-3).

1. Inflammatory back pain
2. Reduced mobility in lumbar columna in sagital and frontal planes
3. Reduced expansion of the thorax by measurements
4. Radiological changes: Bilateral sacroiliitis at least grade 2 or unilateral grade 3-4

Bekhterev's disease, BINDEVEVSSYKDOM.no

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