Tibial contact points cannot be used to determine internal-external axial rotation of the native tibiofemoral joint.

Autor: Simileysky A; Department of Biomedical Engineering, University of California Davis, United States. Electronic address: asimileysky@ucdavis.edu., Hull ML; Department of Biomedical Engineering, University of California Davis, United States; Department of Mechanical Engineering, University of California Davis, United States; Department of Orthopaedic Surgery, University of California Davis, United States. Electronic address: mlhull@ucdavis.edu.
Jazyk: angličtina
Zdroj: The Knee [Knee] 2024 Dec; Vol. 51, pp. 145-152. Date of Electronic Publication: 2024 Sep 19.
DOI: 10.1016/j.knee.2024.08.019
Abstrakt: Background: In the study of tibiofemoral kinematics of the native knee, internal-external (IE) axial rotation is a motion of interest. Locations of contact by the femur on the tibia (termed tibial contact points) have been used to determine IE rotations but such rotations might not be useful due to large error. Hence, our objective was to determine whether tibial contact points are useful in quantifying IE rotations of the native knee.
Method: Fluoroscopic images of the native knee were analyzed from 25 subjects who performed a weight-bearing deep knee bend. For each subject, 3D bone + cartilage models were created. Following 3D model-to-2D image registration, anterior-posterior (AP) positions of the lowest points and the tibial contact points were computed for each femoral condyle at 0°, 30°, 60°, and 90° of flexion. IE rotations were the angles between lines connecting points in the medial and lateral tibial compartments at different flexion angles.
Results: Based on the lowest points, the tibia rotated internally on the femur primarily during the first 30° of flexion. In this range, mean internal tibial rotation based on tibial contact points was negligible but internal tibial rotation was significantly greater based on lowest points (0° vs 7°, p = 0.0002). At 90° of flexion, the difference was maintained (1.8° vs 8.3°, p = 0.0007).
Conclusion: While tibial contact points are useful in the study of wear of tibial inserts in total knee arthroplasty (TKA), tibial contact points considerably underestimate internal tibial rotation during flexion in the native knee and should not be used to quantify tibiofemoral kinematics.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: S. Simileysky is an employee of Abbott Laboratories. M. L. Hull receives research support from Medacta USA, Inc. and is on the editorial board of the Journal of Biomechanics.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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