title: High rate of infection control with one-stage revision of septic knee prostheses excluding MRSA and MRSE.
abstract: BACKGROUND
  The rate of infection control for one-stage revision of infected knee arthroplasties is unclear as are the factors influencing infection control. Such factors include duration of infection and the type of infected prosthesis.
  
  
  OBJECTIVE
  We therefore determined: (1) the rate of infection control with one-stage revision of septic knee prostheses, (2) the clinical knee scores that can be achieved, (3) whether the duration of infection or the type of prosthesis influence the level of infection control, and (4) whether different types of prostheses influence the knee scores.
  
  
  METHODS
  We retrospectively reviewed prospectively collected data from 63 patients who underwent one-stage revisions of septic knee endoprostheses (six unicondylar, 37 primary total knee replacement prostheses, and 20 hinged knee endoprostheses) between 2004 and 2006. All were treated locally and systemically with microorganism-specific antibiotics. For this study we excluded patients with Methicillin-resistant Staphylococcus aureus and Methicillin-resistant Staphylococcus epidermidis or unknown microorganisms. The patients were examined for infection every 3 months and Oxford and Knee Society scores were assessed at the same time. The minimum followup was 24 months (mean followup, 36 months; range, 24-70 months).
  
  
  RESULTS
  None of the patients with replacement unicondylar and primary total knee replacement prostheses had recurrence of infection. Three of the 20 patients with the hinged infected knee prostheses had recurrences; these three patients had chronic infections and had undergone two to three revision operations during at least a 5-year period. The likelihood of infection control was influenced by the duration of infection. The mean Knee Society knee score 24 months after surgery was 72 points (range, 20-98 points), the Knee Society function score was 71 points (range, 10-100 points), and the Oxford-12 knee score was 27 points (range, 13-44 points).
  
  
  CONCLUSIONS
  One-stage revision of septic knee prostheses achieved an infection control rate of 95% and higher knee scores than reported for two-stage revisions. Higher rates of recurrent infection appeared to be associated with long-term chronic infections of hinged prostheses.
authors.affiliation: Clinic of Joint Replacement, General and Rheumatic Orthopaedics, Orthopaedic Clinic Markgröningen gGmbH, Kurt-Lindemann-Weg 10, 71706, Markgröningen, Germany, j.singer@okm.de.
authors.forename: Joachim
authors.initials: J
authors.lastname: Singer
authors.forename: Andreas
authors.initials: A
authors.lastname: Merz
authors.forename: Lars
authors.initials: L
authors.lastname: Frommelt
authors.forename: Bernd
authors.initials: B
authors.lastname: Fink
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D017053:Infection Control / Q000379:methods* / Q000706:statistics & numerical data; D007719:Knee Joint / Q000382:microbiology / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis / Q000382:microbiology*; D008297:Male; D055624:Methicillin-Resistant Staphylococcus aureus / Q000302:isolation & purification; D008875:Middle Aged; D018579:Patient Selection; D016459:Prosthesis-Related Infections / Q000382:microbiology / Q000601:surgery*; D012086:Reoperation; D012189:Retrospective Studies; D013203:Staphylococcal Infections / Q000382:microbiology / Q000517:prevention & control*; D013212:Staphylococcus epidermidis / Q000302:isolation & purification
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