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Construction-conditioned rollback in total knee replacement: fluoroscopic results
- Source :
- Acta of bioengineering and biomechanics. 13(3)
- Publication Year :
- 2011
-
Abstract
- Firstly, the way of implementing approximatively the initial rollback of the natural tibiofemoral joint (TFJ) in a total knee replacement (AEQUOS G1 TKR) is discussed. By configuration of the curvatures of the medial and lateral articulating surfaces a cam gear mechanism with positive drive can be installed, which works under force closure of the femoral and tibial surfaces. Briefly the geometric design features in flexion/extension are described and construction-conditioned kinematical and functional properties that arise are discussed. Due to a positive drive of the cam gear under the force closure during the stance phase of gait the articulating surfaces predominantly roll. As a result of rolling, a sliding friction is avoided, thus the resistance to motion is reduced during the stance phase. Secondly, in vivo fluoroscopic measurements of the patella tendon angle during flexion/extension are presented. The patella tendon angle/ knee flexion angle characteristic and the kinematic profile in trend were similar to those observed in the native knee during gait (0°-60°).
Details
- ISSN :
- 1509409X
- Volume :
- 13
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Acta of bioengineering and biomechanics
- Accession number :
- edsair.pmid..........f76ab41a5eb44e3ec31550a1a82ef5dd