title: The dislocating hip replacement - revision with a dual mobility cup in 56 consecutive patients.
abstract: BACKGROUND
  Recurrent dislocations of hip replacements are a difficult challenge. One treatment option for recurrent dislocations is the use of a dual mobility cup. The aim of this study was to retrospective investigate the effect of dual mobility cups as a treatment for recurrent dislocations in a consecutive series. Materials and.
  
  
  METHODS
  56 consecutive patients were revised in the period November 2000 to December 2010. The mean age at revision was 72 years (SD 11, range 37-92)) and median number of dislocations before revision surgery were 4 (IQR, 2-11). In all cases, revision was made with a Saturne dual mobility cup (Amplitude, Neyron, France). The mean follow-up period was 44 months (SD 30, range 0.1-119).
  
  
  RESULTS
  One patient (1.8%) experienced a re-dislocation. Three patients (5.3%) had to be revised. One due to disintegration between the femoral head and inner shell, one due to loosening of the acetabular component, and one due to infection. Harris Hip Score improved from a mean of 76 before index surgery to 87 within one year after index surgery.
  
  
  CONCLUSIONS
  This study advocates the use of a dual mobility cup for treatment of recurrent dislocations of THR. However, studies with a longer follow up are needed in order to evaluate implant survival.
authors.affiliation: Department of Orthopaedics, Regional Hospital of Viborg, Denmark.
authors.forename: Thomas
authors.initials: T
authors.lastname: Jakobsen
authors.affiliation: Department of Orthopaedics, Aalborg University Hospital, Denmark.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kappel
authors.affiliation: Department of Orthopaedics, Regional Hospital of Randers, Denmark.
authors.forename: Flemming
authors.initials: F
authors.lastname: Hansen
authors.affiliation: Department of Orthopaedics, Regional Hospital of Viborg, Denmark.
authors.forename: Niels
authors.initials: N
authors.lastname: Krarup
keywords: Dual mobility cup; Hip arthroplasty; THA.; recurrent dislocation; revision surgery