Abstract
A total knee has been designed to mimic less-compliant medial and more-compliant lateral
behavior. In vivo testing compared open-kinematic chain behaviors of cadaver knees
in their normal state and after implantation of the knee prosthesis. Specimen's limbs
were computed tomography scanned, and infrared arrays on tibia and femur were registered
to bone markers. Motion of the joint and quadriceps force were reported from 90° flexion
to full extension. Less medial and more lateral anterior-posterior motion was seen
in both the intact and the implanted knees. Tibiofemoral rotation and translation
were similar in direction but were reduced in magnitude for the prosthetic knees.
Quadriceps force, defined as that applied force required to extend the knee, required
after implantation was variable between specimens but not statistically different
from the intact condition. The prosthesis tested exhibits kinematic behavior similar
to that in their normal state, with no difference in quadriceps force required for
extension.
Keywords
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Article info
Publication history
Accepted:
February 7,
2012
Received:
July 2,
2010
Footnotes
Supplementary material available at www.arthroplastyjournal.org.
The Conflict of Interest statements associated with this article can be found at doi:10.1016/j.arth.2012.02.008.
Identification
Copyright
© 2012 Elsevier Inc. Published by Elsevier Inc. All rights reserved.
