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

Hani Haider, Peter Walker, John Desjardins, Gordon Blunn

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

2 Scopus citations


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 (US)
Title of host publicationWear of Articulating Surfaces
Subtitle of host publicationUnderstanding Joint Simulation
PublisherASTM International
Number of pages14
ISBN (Print)0803134150, 9780803134157
StatePublished - 2007
EventSymposium on Wear of Articulating Surfaces: Understanding Joint Simulation - Dallas, TX, United States
Duration: Nov 8 2005Nov 8 2005

Publication series

NameASTM Special Technical Publication
Volume1472 STP
ISSN (Print)0066-0558


ConferenceSymposium on Wear of Articulating Surfaces: Understanding Joint Simulation
Country/TerritoryUnited States
CityDallas, TX


  • Knee kinematics
  • Knee simulator
  • Knee surgical technique
  • Mobile bearing knee
  • TKR wear

ASJC Scopus subject areas

  • General Engineering


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