title: Relationship between hip dysplasia, pain, and osteoarthritis in a cohort of patients with hip symptoms.
abstract: OBJECTIVE
  The relationship between acetabular dysplasia (HD) and hip osteoarthritis (OA) remains unclear, especially for mild forms of dysplasia. Our objectives were to estimate the prevalence of HD in a population-based sample with symptoms and to evaluate potential associations linking HD, hip OA, and hip pain.
  
  
  METHODS
  Individuals 40 to 75 years of age with symptoms in 1 or both hips were recruited during a multiregional prevalence survey. All study participants underwent examination and radiographs. Radiographs were evaluated using Kellgren-Lawrence staging (with stages ≥ 2 indicating hip OA) and HD measures [center-edge (CE) angle, acetabular inclination angle (HTE), acetabular depth (AD), and vertical center-anterior margin angle].
  
  
  RESULTS
  We studied both hips of 842 individuals (1684 hips), among whom 203 had hip OA. Compared to left hips, right hips had significantly smaller CE angles and significantly greater AD and HTE values (p ≤ 0.001). Overall, the prevalence of HD ranged from 7.6% to 22.2% of the hips depending on the measure used. The prevalence of HD was higher in individuals with hip OA, with significant differences for abnormal HTE (19.1% vs 11.4%; p < 0.0001) and abnormal CE (11.3% vs 7.5%; p = 0.04). By logistic regression, only abnormal HTE remained associated with OA. Same-side hip pain was not statistically more common in individuals with HD after stratification on OA status (p = 0.12).
  
  
  CONCLUSIONS
  Our study confirms the relationship between OA and HD, particularly as defined based on the HTE angle.
authors.affiliation: Medicine Department, Laennec Hospital, Quimper; Radiology Department, Cavale Blanche University Hospital, Brest, France.
authors.forename: Johanne
authors.initials: J
authors.lastname: Morvan
authors.forename: Ronan
authors.initials: R
authors.lastname: Bouttier
authors.forename: Bernard
authors.initials: B
authors.lastname: Mazieres
authors.forename: Evelyne
authors.initials: E
authors.lastname: Verrouil
authors.forename: Jacques
authors.initials: J
authors.lastname: Pouchot
authors.forename: Anne-Christine
authors.initials: AC
authors.lastname: Rat
authors.forename: Dewi
authors.initials: D
authors.lastname: Guellec
authors.forename: Francis
authors.initials: F
authors.lastname: Guillemin
authors.forename: Joel
authors.initials: J
authors.lastname: Coste
authors.forename: Alain
authors.initials: A
authors.lastname: Saraux
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006617:Hip Dislocation / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D010146:Pain / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D015995:Prevalence; D011859:Radiography
keywords: COHORT; HIP DYSPLASIA; OSTEOARTHRITIS; PAIN