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International Orthopaedics

, Volume 33, Issue 3, pp 687–693 | Cite as

Optimisation of the posterior stabilised tibial post for greater femoral rollback after total knee arthroplasty—a finite element analysis

  • Nagarajan Chandran
  • Farid Amirouche
  • Mark H. Gonzalez
  • Kevin M. Hilton
  • Riad Barmada
  • Wayne Goldstein
Original Paper

Abstract

Femoral rollback after total knee arthroplasty (TKA) is necessary for flexion beyond 90–100°. Femoral rollback in posterior cruciate substituting TKA occurs as a result of the interaction between the femoral cam and tibial post. The geometric design of the cam post mechanism determines the kinematics of rollback. The purpose of this study is to optimise the design of the femoral cam-tibial post articulation through finite element analysis and suggest various design parameters that would optimise femoral rollback. Modifications to the tibial post geometry without changing the relative post position or slope are made. Results are characterised in terms femoral rollback and pressure distribution at the tibial post. Small design modifications to the tibial post are seen to produce large changes in femoral rollback with relatively small accompanying increases in contact pressures at the tibial post.

Keywords

Total Knee Arthroplasty Contact Pressure Femoral Component Posterior Cruciate Ligament UHMWPE 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Le rollback fémoral après prothèse totale du genou est nécessaire lorsque la flexion va au delà de 90 à 100°. Le rollback fémoral dans les prothèses postéro-stabilisées est le résultat de l’interaction entre la came fémorale et le plot tibial postérieur. La géométrie de la came détermine la cinématique de ce rollback. Le but de cette étude est d’optimiser le dessin de la came fémorale et de son articulation avec la butée tibiale postérieure. Il s’agit d’une étude par éléments finis. Des modifications du dessin de la butée tibiale postérieure, sans changer sa position ou sa pente ont été réalisés. Les résultats ont été définis en terme de rollback et de pression au niveau de la butée postérieure. De petites modifications du dessin de cette butée postérieure peuvent entraîner d’importantes modifications du rollback sans augmenter les pressions au niveau de la butée postérieure.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Nagarajan Chandran
    • 1
  • Farid Amirouche
    • 1
    • 2
  • Mark H. Gonzalez
    • 1
    • 2
    • 3
  • Kevin M. Hilton
    • 2
  • Riad Barmada
    • 2
  • Wayne Goldstein
    • 2
  1. 1.Biomechanics Research LaboratoryUniversity of Illinois at ChicagoChicagoUSA
  2. 2.Department of Orthopaedics, College of MedicineUniversity of Illinois-ChicagoChicagoUSA
  3. 3.Department of Orthopaedic SurgeryChicagoUSA

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