title: Early catastrophic failure of Birmingham acetabular dysplasia cup in revision arthroplasty: a case report.
abstract: BACKGROUND
  Revision acetabulum arthroplasty is one of the common procedures, which has been on the rise recently. Many implants are available in the market with variable results. Aseptic loosening is the most common indication for revision acetabulum arthroplasty. Birmingham dysplasia cup has been used occasionally in these complex procedures. We know that these implants have provided good results in resurfacing dysplastic hips with bone loss. Literature review failed to answer whether these implants were as effective in revision acetabulum arthroplasty.
  
  
  METHODS
  We herby, present a case of revision acetabulum arthroplasty performed with Birmingham dysplasia acetabular cup, which unfortunately failed within a period of eight months. Surgical technique appeared to be adequate. On further analysis, significant differences were identified between dysplastic hips with bone loss and revision hips with bone loss.
  
  
  CONCLUSIONS
  Therefore results obtained with dysplasia cups in resurfacing dysplastic hips does not seem to be applicable to revision hip arthroplasty. Hence these cups should be restricted to primary arthroplasty.
authors.affiliation: Department Of Orthopaedics, James Cook University Hospital Middlesbrough, TS4 3BW UK. drbrm2004@yahoo.co.uk
authors.forename: Manjunath
authors.initials: M
authors.lastname: Ramappa
authors.forename: Andrew
authors.initials: A
authors.lastname: Port