title: Bearing exchange in the management of pseudotumours.
abstract: BACKGROUND
  Soft tissue reactions following metal-on-metal (MoM) arthroplasty of the hip have been under considerable discussion. These reactions are seen following both hip resurfacing and MoM total hip arthroplasty (THA). The phenomenon may arise owing to shedding of metal particles in high wear states, hypersensitivity with normal metal wear rates or a combination of the two.
  
  
  METHODS
  Three patients were identified who had developed a soft tissue reaction (pseudotumour) following MoM hip resurfacing procedures. The prostheses were revised to ceramic-on-ceramic (CoC) THA with only minimal debridement of the pseudotumour. Pre and postoperative magnetic resonance imaging was performed to assess the size of the lesions.
  
  
  RESULTS
  Progressive and satisfactory resolution of the associated pseudotumours was identified following revision of the prostheses to CoC THA.
  
  
  CONCLUSIONS
  In the early stages of pseudotumour formation following MoM hip resurfacing, this potentially devastating condition can be managed adequately with revision to a CoC bearing THA with minimal soft tissue excision.
authors.affiliation: Weston Area Health NHS Trust, UK. mark.kemp@doctors.org.uk
authors.forename: M A
authors.initials: MA
authors.lastname: Kemp
authors.forename: A
authors.initials: A
authors.lastname: Mitra
authors.forename: T Mendes
authors.initials: TM
authors.lastname: da Costa
authors.forename: R F
authors.initials: RF
authors.lastname: Spencer
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D002516:Ceramics / Q000627:therapeutic use*; D005260:Female; D006104:Granuloma, Plasma Cell / Q000209:etiology / Q000601:surgery*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008670:Metals / Q000009:adverse effects*; D008875:Middle Aged; D011475:Prosthesis Failure / Q000009:adverse effects*; D012086:Reoperation
chemical_list: D008670:Metals