title: Long term survivorship following Scorpio Total Knee Replacement.
abstract: BACKGROUND
  The Scorpio Total Knee Replacement (TKR) is one of the most commonly used prosthesis in the United Kingdom. Concerns arose at our institution that there was a high revision rate for this prosthesis. No study has assessed survivorship of this prosthesis over 10 years.
  
  
  METHODS
  Four hundred and fifty-six consecutive patients, who underwent a primary Scorpio TKR, were clinically and radiologically evaluated. WOMAC, Oxford Knee Score and all complications including the reason for revision surgery were recorded. The Knee Society Roentgenographic Evaluation and Scoring System was used to evaluate all radiographs for prosthesis alignment and degree of subsequent lucency. Survival analysis for the prosthesis was calculated using Kaplan-Meier curves, with revision as an end-point. Patient reported outcome measures were compared against radiographic evaluation.
  
  
  RESULTS
  At a mean of 12.5 years (range 10-14 years), 196 (43.0%) patients were available for review; 124 (27.2%) were lost to follow-up and 136 (29.8%) patients had died of unrelated causes. Seven (3.6%) patients required revision surgery at a mean of 5.4 years; five because of aseptic loosening and two because of septic loosening. Cumulative survival for the prosthesis was 99.5% for any cause at five years and 97.4% at 14 years. The mean OKS and WOMAC score at final follow-up was 30.64 (range 12-48) and 74 (18.9-100) respectively.
  
  
  CONCLUSIONS
  The Scorpio TKR has good long term survivorship and functional outcomes. There is no apparent increased revision rate for this prosthesis in our study.
  
  
  METHODS
  Level IV case series.
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Martin
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Quah
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Syme
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Lammin
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Segaren
authors.affiliation: Trauma and Orthopaedic Department, Royal Derby Hospital, Derby, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Pickering
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000401:mortality / Q000503:physiopathology / Q000601:surgery*; D011183:Postoperative Complications / Q000401:mortality*; D011379:Prognosis; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D015996:Survival Rate / Q000639:trends; D013997:Time Factors; D016896:Treatment Outcome; D006113:United Kingdom / Q000453:epidemiology
keywords: Scorpio; Total Knee Replacement