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: Contribution to journalArticle

18 Citations (Scopus)

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/tibial component rotational position, and the tightness of the posterior cruciate ligament (PCL). Seven different (four fixed-bearing 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 (varus-valgus 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)
JournalJournal of ASTM International
Volume3
Issue number10
DOIs
StatePublished - Nov 1 2006

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Knee prostheses
Posterior Cruciate Ligament
Knee Replacement Arthroplasties
Ligaments
Force control
Biomechanical Phenomena
Kinematics
Bearings (structural)
Activity Cycles
Walking
Medical Errors
Thigh
Arthritis
Knee
Anatomy
Simulators

Keywords

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

ASJC Scopus subject areas

  • Environmental Engineering
  • Materials Science(all)
  • Nuclear Energy and Engineering
  • Engineering(all)
  • Public Health, Environmental and Occupational Health

Cite this

Effects of patient and surgical alignment variables on kinematics in TKR simulation under force-control. / Haider, Hani; Walker, Peter; DesJardins, John; Blunn, Gordon.

In: Journal of ASTM International, Vol. 3, No. 10, 01.11.2006.

Research output: Contribution to journalArticle

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