Abstract
This study aimed to develop and validate a novel flexion axis concept by calculating the points on femoral condyles that could maintain constant heights during knee flexion. Twenty-two knees of 22 healthy subjects were investigated when performing a weightbearing single leg lunge. The knee positions were captured using a validated dual fluoroscopic image system. The points on sagittal planes of the femoral condyles that had minimal changes in heights from the tibial plane along the flexion path were calculated. It was found that the points do formulate a medial-lateral flexion axis that was defined as the iso-height axis (IHA). The six degrees of freedom (6DOF) kinematics data calculated using the IHA were compared with those calculated using the conventional transepicondylar axis and geometrical center axis. The IHA measured minimal changes in proximal–distal translations and varus–valgus rotations along the flexion path, indicating that the IHA may have interesting clinical implications. Therefore, identifying the IHA could provide an alternative physiological reference for improvement of contemporary knee surgeries, such as ligament reconstruction and knee replacement surgeries that are aimed to reproduce normal knee kinematics and medial/lateral soft tissue tensions during knee flexion.
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Funding
This work was supported by the National Institutes of Health (R01AR055612), the Department of Orthopaedic Surgery at Newton-Wellesley Hospital, the Jiangsu provincial government scholarship program, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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JY, CZ, HB, and GL designed the study. YX performed statistical analysis of the data. JY, YX, CZ, TT, and SL performed the data collection, analysis, and assisting in paper writing. JY, YX, TF, HB, and GL interpreted the data and drafted the manuscript. All authors edited, revised, and approved the final version. GL was the chief investigator for the study.
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Yu, J., Xia, Y., Zhou, C. et al. Investigation of Characteristic Motion Patterns of the Knee Joint During a Weightbearing Flexion. Ann Biomed Eng 51, 2237–2244 (2023). https://doi.org/10.1007/s10439-023-03259-1
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DOI: https://doi.org/10.1007/s10439-023-03259-1