title: Early results of a new rotating hinge knee implant.
abstract: BACKGROUND
  Indication for rotating hinge (RH) total knee arthroplasty (TKA) includes primary and revision cases, with contradictory results. The aim of this study was to report prospective early results of a new modular rotating hinge TKA (EnduRo). For this implant several new design features and a new bearing material (carbon-fiber reinforced poly-ether-ether-ketone) have been developed. Furthermore, we tried to establish a new classification of failure modes for revision TKA.
  
  
  METHODS
  152 EnduRo rotating-hinge prostheses were implanted in two centers. In 90 patients a primary implantation has been performed and 62 patients were revision cases. Knee Society Score (KSS), Western Ontario and McMaster Osteoarthritis Index (WOMAC), Oxford Knee Score (OKS), and Range of motion (ROM) were assessed before surgery, 3 months postoperatively, 12 months postoperatively, and annually thereafter. We defined 3 types of complications: Type 1, infection; type 2, periprosthetic complications; type 3, implant failures.
  
  
  RESULTS
  KSS, WOMAC, OKS, and ROM revealed significant improvements between the preoperative and the follow-up investigations. There were 14 complications (9.2%) leading to revision surgery, predominantly type 2.
  
  
  CONCLUSIONS
  Our study shows excellent clinical results of the EnduRo TKA. Furthermore, no premature material failure or unusual biological response to the new bearing material could be detected.
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
authors.forename: Alexander
authors.identifier: 0000-0003-3932-8620
authors.initials: A
authors.lastname: Giurea
authors.affiliation: Department of Traumatology and Orthopaedics, St. Vincenz Hospital Am Stein 24, 58706 Menden, Germany.
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Neuhaus
authors.affiliation: The Rhine-Main Center of Joint Diseases, Wilhelmstraße 30, 65183 Wiesbaden, Germany.
authors.forename: Rolf
authors.initials: R
authors.lastname: Miehlke
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schuh
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
authors.forename: Richard
authors.identifier: 0000-0002-1617-0800
authors.initials: R
authors.lastname: Lass
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
authors.forename: Bernd
authors.initials: B
authors.lastname: Kubista
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.
authors.forename: Reinhard
authors.identifier: 0000-0002-6321-1804
authors.initials: R
authors.lastname: Windhager
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018771:Arthralgia / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control*; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D019544:Equipment Failure Analysis; D005858:Germany; D006801:Humans; D007593:Joint Instability / Q000150:complications / Q000175:diagnosis* / Q000601:surgery*; D007720:Knee Prosthesis; D008875:Middle Aged; D010865:Pilot Projects; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012399:Rotation; D016896:Treatment Outcome
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