Effects of patient and surgical alignment variables on kinematics in TKR simulation under force-control

Hani Haider*, Peter Walker, John Desjardins, Gordon Blunn

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Simulation of total knee replacement (TKR) is typically achieved by Integrating sliding/rolling motions and loads between the Implant's articulating surfaces during an activity cycle such as walking. Clinically, however, Important variations In implant alignment and duty occur due to variability In patient anatomy/arthritic deformity, compounded by choices or errors in surgical Installation. This study Investigated the effects of the activity cycle severity, frontal plane alignment, relative femoral/tlblal component rotational position, and the tightness of the posterior cruciate ligament (PCL). Seven different (four fixedbearing and three mobile-bearing) cruciate-retaining TKRs with different Inherent constraints were tested on a force-control knee simulator. As well as the ISO standard wave forms for walking, an Enhanced Duty Cycle was used. The resulting anterior-posterior displacements and axial rotations were increased with the Enhanced Duty Cycle. Changing the line of action of the compressive force In the frontal plane (varusvalgus over/under-correction) did not appreciably change the kinematics. Rotating the tibial component shifted the rotational curves In the same direction as the misalignment. The PCL tightness produced the most noticeable effect on kinematics; a tight PCL reduced both displacements and rotations, and a loose PCL did the opposite.

Original languageEnglish
Title of host publicationWear of Articulating Surfaces
Subtitle of host publicationUnderstanding Joint Simulation
PublisherASTM International
Pages3-16
Number of pages14
Volume1472 STP
ISBN (Print)0803134150, 978-0803134157
DOIs
Publication statusPublished - 2007
EventSymposium on Wear of Articulating Surfaces: Understanding Joint Simulation - Dallas, TX, United States
Duration: 8 Nov 20058 Nov 2005

Conference

ConferenceSymposium on Wear of Articulating Surfaces: Understanding Joint Simulation
CountryUnited States
CityDallas, TX
Period8/11/058/11/05

Keywords

  • knee kinematics
  • knee simulator
  • knee surgical technique
  • mobile bearing knee
  • TKR wear

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