title: Midterm results following uncemented, modular, fully porous coated stem used in revision total hip arthroplasty: Comparison of two stem systems.
abstract: BACKGROUND
  Aim of this study was to evaluate stem subsidence and survivorship of implant following implantation of Revitan (Zimmer) and MP (Waldemar Link) stems.
  
  
  METHODS
  Retrospective case series with clinical and radiological follow-up of 1-10 years.
  
  
  RESULTS
  47 Revitan and 57 MP stems were analyzed. In 12 cases there was subsidence of the stem present. Two Revitan stems and one MP stem were revised as a result of subsidence. Failure rate was 4.3% for Revitan, 1.8% for MP stem and difference was not statistically significant.
  
  
  CONCLUSIONS
  There is no significant difference in subsidence or survivorship between Revitan and MP stems.
authors.affiliation: ST6 Trauma and Orthopaedics, Prince Philip Hospital, Llanelli, Carmarthenshire SA14 8QF, United Kingdom.
authors.forename: Konrad Sebastian
authors.initials: KS
authors.lastname: Wronka
authors.affiliation: Prince Philip Hospital, Llanelli, Carmarthenshire SA14 8QF, United Kingdom.
authors.forename: Peter Herman Johan
authors.initials: PH
authors.lastname: Cnudde
keywords: Hip revision; Modular stem; Revision THR; Revision arthroplasty; Uncemented revision; Uncemented stem