title: Comparison of the primary stability of different tibial baseplate concepts to retain both cruciate ligaments during total knee arthroplasty.
abstract: BACKGROUND
  A novel tibial baseplate design (Transversal Support Tibial Plateau) as a new treatment concept for bi-cruciate retaining total knee arthroplasty is evaluated for mechanical stability and compared to other tibial baseplate designs. This concept should provide better primary stability and thus, less subsidence, than implantation of two separate unicondylar tibial baseplates.
  
  
  METHODS
  Different baseplates were implanted into synthetic bone specimens (Sawbones® Pacific Research Laboratories, Inc., Washington, USA), all uncemented. Using a standardized experimental setup, subsidence was achieved, enabling comparison of the models regarding primary stability.
  
  
  RESULTS
  Overall implant subsidence was significantly increased for the two separate unicondylar tibial baseplates versus the new Transversal Support Tibial Plateau concept, which showed comparable levels to a conventional tibial baseplate. Reduced subsidence results in better primary stability.
  
  
  CONCLUSIONS
  Linking of two separate baseplates appears to provide increased primary stability in terms of bony fixation, comparable to that of a conventional single tibial baseplate.
authors.affiliation: Orthopaedic Department, University of Basel, Spitalstrasse 21, 4031 Basel, Switzerland. Electronic address: andrej.nowakowski@unibas.ch.
authors.forename: Andrej M
authors.initials: AM
authors.lastname: Nowakowski
authors.forename: Melanie
authors.initials: M
authors.lastname: Stangel
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Grupp
authors.forename: Victor
authors.initials: V
authors.lastname: Valderrabano
mesh_terms: D000704:Analysis of Variance; D016118:Anterior Cruciate Ligament / Q000503:physiopathology*; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control*; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D007720:Knee Prosthesis; D008954:Models, Biological; D009068:Movement / Q000502:physiology; D016119:Posterior Cruciate Ligament / Q000503:physiopathology*; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology
keywords: Cruciate retaining; Primary stability; Total knee arthroplasty; Transversal support tibial plateau