title: Urolithiasis in ankylosing spondylitis: Correlation with Bath ankylosing spondylitis disease activity index (BASDAI), Bath ankylosing spondylitis functional index (BASFI) and Bath ankylosing spondylitis metrology index (BASMI).
abstract: BACKGROUND
  Increased incidence of renal stone has been reported in ankylosing spondylitis (AS), but unlike some well-known renal involvements, they have not been fully studied. The aim of this study was to investigate the association of AS with urolithiasis and also the relation between urinary stone and severity markers.
  
  
  METHODS
  One hundred-sixty three AS patients were included in a cross-sectional study from Iranian AS association, Iran Rheumatology Center and Rheumatology Clinic of Shariati Hospital in Tehran. Prevalence of urolithiasis in AS patients was compared with results of a nationwide survey in Iran. Bath ankylosing spondylitis disease activity index (BASDAI), bath ankylosing spondylitis functional index (BASFI) and bath ankylosing spondylitis metrology index (BASMI) were determined for assessment of disease severity.
  
  
  RESULTS
  Urolithiasis was observed in 11.7% of AS patients versus 5.7% of normal population (p=0.001). After the elimination of corticosteroid effect, the prevalence of urolithiasis was still higher in AS patients than normal population but without maintaining significant difference. Significant higher values of BASFI, BASMI, BASDAI scores were observed in AS with urolithiasis than AS without urolithiasis.
  
  
  CONCLUSIONS
  The results confirmed the association of AS with urolithiasis. However, this may be partly due to the effect of other factors such as corticosteroid. Moreover, urolithiais is accompanied with more severe diseases.
authors.affiliation: Department of Rheumatology, Kerman University of Medical Sciences, Kerman, Iran. ; Rheumatology Research Center, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sasan
authors.initials: S
authors.lastname: Fallahi
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Jamshidi
authors.forename: Farhad
authors.initials: F
authors.lastname: Gharibdoost
authors.forename: Mahdi I
authors.initials: MI
authors.lastname: Mahmoud
authors.forename: Pedram
authors.initials: P
authors.lastname: Paragomi
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Nicknam
authors.forename: Elham
authors.initials: E
authors.lastname: Farhadi
authors.forename: Mostafa
authors.initials: M
authors.lastname: Qorbani
keywords: Ankylosing spondylitis; BASDAI; BASFI; Urolithiasis