title: Salvage of Monoblock Metal-on-Metal Acetabular Components Using a Dual-Mobility Bearing.
abstract: BACKGROUND
  Large-diameter, monoblock acetabular components have been used for both hip resurfacing arthroplasty and metal-on-metal (MoM) total hip arthroplasty (THA). If revision is required, one solution is to retain the shell and use a dual-mobility bearing.
  
  
  METHODS
  We reviewed the results of 25 revision THAs including 11 hip resurfacing arthroplasty and 14 MoM THAs where a monoblock acetabular component was mated to a dual-mobility bearing.
  
  
  RESULTS
  At a mean of 29 months, there was one failure, an intraprosthetic dislocation of the dual-mobility bearing. There was a significant decrease in serum metal ion levels postoperatively.
  
  
  CONCLUSIONS
  Retention of a well-fixed, monoblock MoM acetabular shell and mating it to a dual-mobility bearing in the setting of revision surgery seems to be a reasonable, low-morbidity option at short-term follow-up in appropriately positioned cups.
authors.affiliation: Department of Orthopaedic Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio.
authors.forename: Darren R
authors.initials: DR
authors.lastname: Plummer
authors.affiliation: Knoxville Orthopaedic Clinic, Knoxville, Tennessee.
authors.forename: Herman G
authors.initials: HG
authors.lastname: Botero
authors.affiliation: Joint Implant Surgeons, New Albany, Ohio.
authors.forename: Keith R
authors.initials: KR
authors.lastname: Berend
authors.affiliation: Swedish Medical Center, Seattle, Washington.
authors.forename: James W
authors.initials: JW
authors.lastname: Pritchett
authors.affiliation: Joint Implant Surgeons, New Albany, Ohio.
authors.forename: Adolph V
authors.initials: AV
authors.lastname: Lombardi
authors.affiliation: Midwest Orthopaedics at Rush, Chicago, Illinois.
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Della Valle
mesh_terms: D000077:Acetabulum; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008670:Metals; D008875:Middle Aged; D011475:Prosthesis Failure; D012086:Reoperation / Q000295:instrumentation*; D012189:Retrospective Studies
chemical_list: D008670:Metals
keywords: adverse local tissue reaction; bearing surfaces; metal-on-metal; revision total hip arthroplasty; salvage monoblock metal-on-metal; total hip arthroplasty