期刊
INTERNATIONAL ORTHOPAEDICS
卷 34, 期 4, 页码 497-503出版社
SPRINGER
DOI: 10.1007/s00264-009-0777-2
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资金
- Zimmer Inc., Warsaw, IN, USA
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 > 130A 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 A +/- 4.5A degrees. Posterior femoral translation and internal tibial rotation increased steadily beyond 90A degrees flexion, and a sharp increase in varus rotation was noted at maximum flexion. Initial cam-post engagement was observed at 100.3 A +/- 6.7A 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.
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