Published in:
01-03-2004 | Knee
Dynamic in-vivo tibio-femoral and bearing motions in mobile bearing knee arthroplasty
Authors:
S. Fantozzi, A. Leardini, S. A. Banks, M. Marcacci, S. Giannini, F. Catani
Published in:
Knee Surgery, Sports Traumatology, Arthroscopy
|
Issue 2/2004
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Abstract
To determine the tibio-femoral and bearing motions in well functioning mobile bearing total knee arthroplasties, a quantitative analysis by means of fluoroscopy was carried out during stair ascending, chair rising-sitting and step up-down motor tasks. Femoral and tibial component positions were obtained using a CAD-model-based shape matching technique. Direct measurement of mobile bearing motion was carried out by tracking previously inserted tantalum beads. A relatively small motion of the bearing was observed. The advantage of self-alignment claimed for the mobile bearing arthroplasty seems to be confirmed by subject-specific ranges of motion exhibited by these patients. It has also been demonstrated that these total knee arthroplasties, which are not fully conforming in flexion, provide little constraint to antero-posterior motion, leading to a kinematic pattern very similar to an ACL deficient knee.