title: Prevalence and characteristics of hip involvement in spondyloarthritis: a single-centre observational study of 275 patients.
abstract: OBJECTIVE
  Hip involvement is a classic feature of spondyloarthritis (SpA). The aim of the present paper is to study the prevalence, clinical and radiological features of hip involvement, and the association with criteria for severity, in a cohort of patients with SpA in a tertiary care centre.
  
  
  METHODS
  
  
  
  METHODS
  retrospective single centre observational study in 2010 of patients with definite SpA who underwent direct interview by a physician. Hip involvement was defined as hip pain considered related to SpA inflammation and confirmed radiographically. Other data collection: demographic data, SpA characteristics, treatments performed for hip involvement.
  
  
  METHODS
  prevalence of hip involvement was analysed according to disease duration (Kaplan-Meyer). Multivariate Cox analysis compared patients with vs. without hip involvement over time.
  
  
  RESULTS
  In all, 275 SpA patients were assessed. The median age was 45 (IQR 35-55) years, the median SpA symptom duration 14 (7-25) years, 61% (169) were men, and 79% were HLA-B27 positive. Hip involvement was found in 18% (49) SpA patients, with already 13% after 5 years of disease duration and with frequent bilateral involvement (61%). Hip involvement was associated with non-Caucasian origin (p=0.05). Thirty-three percent (16/49) needed surgery (23 total joint replacements in all) with good functional results.
  
  
  CONCLUSIONS
  Hip involvement is a frequent manifestation in SpA (18%), often bilateral, and associated with non-Caucasian origin. One third of the patients needed total joint replacement. Physicians should be wary of hip pain in SpA patients and implement rapid diagnostic procedures in such cases.
authors.affiliation: Paris Descartes University, Medicine Faculty, APHP, Cochin Hospital, Rheumatology B Department, Paris, France. vincentburki@hotmail.com
authors.forename: Vincent
authors.initials: V
authors.lastname: Burki
authors.forename: Laure
authors.initials: L
authors.lastname: Gossec
authors.forename: Judith
authors.initials: J
authors.lastname: Payet
authors.forename: Anne
authors.initials: A
authors.lastname: Durnez
authors.forename: Muriel
authors.initials: M
authors.lastname: Elhai
authors.forename: Isabelle
authors.initials: I
authors.lastname: Fabreguet
authors.forename: Eugénie
authors.initials: E
authors.lastname: Koumakis
authors.forename: Magali
authors.initials: M
authors.lastname: Meyer
authors.forename: Simon
authors.initials: S
authors.lastname: Paternotte
authors.forename: Fanny
authors.initials: F
authors.lastname: Roure
authors.forename: Maxime
authors.initials: M
authors.lastname: Dougados
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000453:epidemiology* / Q000473:pathology* / Q000601:surgery; D001168:Arthritis / Q000453:epidemiology / Q000473:pathology; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data; D003430:Cross-Sectional Studies; D005006:Ethnicity / Q000706:statistics & numerical data; D005260:Female; D006621:Hip Joint / Q000473:pathology*; D006801:Humans; D008297:Male; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors; D012720:Severity of Illness Index; D025241:Spondylarthritis / Q000453:epidemiology* / Q000473:pathology*; D055815:Young Adult