Prevalence of ankylosing spondylitis and other spondyloarthropathies among patients with inflammatory bowel disease: a population study (the IBSEN study).

To study the occurrence of spondyloarthropathies (SpA) in patients with inflammatory bowel disease (IBD) seen 6 years after IBD diagnosis.In a population based cohort of 654 patients with IBD, 521 patients (80%) were investigated, which included a complete rheumatological examination. Radiographs of the sacroiliac joints and lumbar spine were performed in 406 of these patients (78%). The development of SpA was analyzed with regard to the...