title: Sacroiliitis is common in Crohn's disease patients with perianal or upper gastrointestinal involvement.
abstract: OBJECTIVE
  Sacroiliitis (SI) is one of the most frequent extraintestinal manifestations in inflammatory bowel disease (IBD) patients, but the exact prevalence has not been evaluated in Asia. There are few data on the association between SI and other clinical features of IBD. The prevalence of SI was evaluated using computed tomography (CT) and the phenotypic parameters associated with SI in Korean IBD patients were determined.
  
  
  METHODS
  Eighty-two patients with ulcerative colitis (UC) and 81 patients with Crohn's disease (CD) were evaluated clinically. The presence of SI was evaluated using bone window setting of abdomino-pelvic CT images by two radiologists.
  
  
  RESULTS
  The prevalence rates of SI were 12.2% and 21.0% in the UC and CD groups, respectively. There was no relationship between the localization or extent of intestinal inflammation and the presence of SI in the UC group. Multivariate analyses confirmed that perianal and upper-gastrointestinal (from the mouth through to the jejunum) diseases were associated with the occurrence of SI in the CD group (p=0.026 and p=0.047, respectively).
  
  
  CONCLUSIONS
  SI was as common among Korean IBD patients as among Western patients. Perianal or upper-gastrointestinal involvement is associated with SI in CD patients.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Korea.
authors.forename: Young
authors.initials: Y
authors.lastname: Hwangbo
authors.forename: Hyo Jong
authors.initials: HJ
authors.lastname: Kim
authors.forename: Ji Seon
authors.initials: JS
authors.lastname: Park
authors.forename: Kyung Nam
authors.initials: KN
authors.lastname: Ryu
authors.forename: Nam Hoon
authors.initials: NH
authors.lastname: Kim
authors.forename: Jaejun
authors.initials: J
authors.lastname: Shim
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Jang
authors.forename: Seok Ho
authors.initials: SH
authors.lastname: Dong
authors.forename: Byung Ho
authors.initials: BH
authors.lastname: Kim
authors.forename: Young Woon
authors.initials: YW
authors.lastname: Chang
authors.forename: Rin
authors.initials: R
authors.lastname: Chang