title: Bilateral hip osteonecrosis: influence of hip size on outcome.
abstract: OBJECTIVE
  To measure the volume of osteonecrosis in 30 patients with disease in both hips (one side with collapse and the other without at Ficat stage I).
  
  
  METHODS
  The volume of the osteonecrosis was measured by magnetic resonance imaging.
  
  
  RESULTS
  The progression to collapse was influenced by the size of the lesion in each patient. The first collapsed hip was that with the largest volume of osteonecrosis.
  
  
  CONCLUSIONS
  The volume of the osteonecrotic lesion on the second hip (stage I without collapse) is a good predictor of the time to collapse of this second hip.
authors.affiliation: Service de Chirurgie Orthopedique, Hôpital Henri Mondor, 51 avenue de Lattre de Tassigny, 94010 Creteil, France.
authors.forename: P
authors.initials: P
authors.lastname: Hernigou
authors.forename: J C
authors.initials: JC
authors.lastname: Lambotte
mesh_terms: D018450:Disease Progression; D005271:Femur Head Necrosis / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D011379:Prognosis; D018709:Statistics, Nonparametric; D013997:Time Factors