Erschienen in:
01.04.2010 | Original Paper
In vivo knee kinematics during high flexion after a posterior-substituting total knee arthroplasty
verfasst von:
Angela L. Moynihan, Kartik M. Varadarajan, George R. Hanson, Sang-Eun Park, Kyung Wook Nha, Jeremy F. Suggs, Todd Johnson, Guoan Li
Erschienen in:
International Orthopaedics
|
Ausgabe 4/2010
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Abstract
The objective of this study was to investigate biomechanics of TKA patients during high flexion. Six patients (seven knees) with a posterior-substituting TKA and weight-bearing flexion >130° were included in the study. The six degree-of-freedom kinematics, tibiofemoral contact, and cam-post contact were measured during a deep knee bend using dual-plane fluoroscopy. The patients achieved average weight-bearing flexion of 139.5 ± 4.5°. Posterior femoral translation and internal tibial rotation increased steadily beyond 90° flexion, and a sharp increase in varus rotation was noted at maximum flexion. Initial cam-post engagement was observed at 100.3 ± 6.7° flexion. Five knees had cam-post disengagement before maximum flexion. Lateral femoral condylar lift-off was found in five out of seven knees at maximum flexion, and medial condylar lift-off was found in one knee. Future studies should investigate if the kinematic characteristics of posterior-substituting TKA knees noted in this study are causative factors of high knee flexion.