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- Title
In vivo knee kinematics during high flexion after a posterior-substituting total knee arthroplasty.
- Authors
Moynihan, Angela L; Varadarajan, Kartik M; Hanson, George R; Park, Sang-Eun; Nha, Kyung Wook; Suggs, Jeremy F; Johnson, Todd; Li, Guoan
- 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 degrees 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 degrees. Posterior femoral translation and internal tibial rotation increased steadily beyond 90 degrees flexion, and a sharp increase in varus rotation was noted at maximum flexion. Initial cam-post engagement was observed at 100.3 +/- 6.7 degrees 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.
- Publication
International orthopaedics, 2010, Vol 34, Issue 4, p497
- ISSN
1432-5195
- Publication type
Journal Article
- DOI
10.1007/s00264-009-0777-2