title: Is there a difference between the epidemiologic characteristics of hip dislocation diagnosed early and late?
abstract: OBJECTIVE
  To determine if there are epidemiologic differences between patients with early and late developmental dislocation of the hip (DDH).
  
  
  METHODS
  A chart review.
  
  
  METHODS
  A university-affiliated children's hospital.
  
  
  METHODS
  Two hundred and forty-three children, 191 with early DDH and 52 with late DDH.
  
  
  METHODS
  Sex, side involved and prevalence of bilaterality.
  
  
  RESULTS
  There were significant differences between the two groups with respect to side involved (p < 0.0002) and bilaterality (p = 0.006) but not in relation to sex. Left-sided dislocations were predominant in the early group and right-sided dislocations in the late group. Bilaterality was more common in the late group.
  
  
  CONCLUSIONS
  There is circumstantial epidemiologic evidence that late DDH may be a different entity from early DDH.
authors.affiliation: Division of Orthopedic Surgery, Hospital for Sick Children, University of Toronto, Ont.
authors.forename: J F
authors.initials: JF
authors.lastname: Haasbeek
authors.forename: J G
authors.initials: JG
authors.lastname: Wright
authors.forename: D M
authors.initials: DM
authors.lastname: Hedden
mesh_terms: D005260:Female; D006617:Hip Dislocation / Q000175:diagnosis*; D006618:Hip Dislocation, Congenital / Q000175:diagnosis; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D013997:Time Factors