Radiological changes in the sacro-iliac joints and spine of patients with psoriatic arthritis and psoriasis.

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Abstract
Radio-logical examination of the sacro-iliac joints and spine was performed on 23 patients with psoriatic arthritis (Ps.A) and 22 with psoriasis without arthritis (Ps.O). In the majority of cases of Ps.A, syndesmo-phytes and sacro-iliac changes were present. Calcification of the inter-spinous ligaments were seen in 3 and of the ilio-lumbar ligament in 2Vertebral squaring was present in 3. Osteophytes and disk narrowing were seen less often and were thought to represent degenerative disease. Mobility of the spine was usually maintained. These changes are characteristic of a disease entity which may be described as psoriatic spondylitis.