Abstract
The purpose of this study was to measure the three-dimensional movements of the femur, tibia and patella in healthy young people during activities of daily living. A mobile biplane X-ray imaging system was used to obtain simultaneous measurements of six-degree-of-freedom (6-DOF) tibiofemoral and patellofemoral kinematics and femoral condylar motion in ten participants during standing, level walking, downhill walking, stair ascent, stair descent and open-chain (non-weightbearing) knee flexion. Seven of the eleven secondary motions at the knee—three translations at the tibiofemoral joint, three translations at the patellofemoral joint, and patellar flexion—were coupled to the tibiofemoral flexion angle (r2 ≥ 0.71). Tibial internal–external rotation, tibial abduction–adduction, patellar rotation, and patellar tilt were each weakly related to the tibiofemoral flexion angle (r2 ≤ 0.45). The displacements of the femoral condyles were also coupled to the tibiofemoral flexion angle (r2 ≥ 0.70), with the lateral condyle translating further on the tibial plateau than the medial condyle. The center of rotation of the tibiofemoral joint in the transverse plane was located on the medial side in all activities. These findings expand our understanding of the kinematic function of the healthy knee and may be relevant to a range of applications in biomechanics, including the design of prosthetic knee implants and the development of knee models for use in full-body simulations of movement.
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Acknowledgments
This work was supported in part by a Discovery Projects grant (DP120101973) from the Australian Research Council and the Victorian Orthopaedic Research Trust. LT was supported in part by a Postgraduate Scholarship provided by the University of Melbourne.
Author Contributions
HAG, SG, AGS, RS, and MGP designed the study. MGP and RS obtained funding for the research. LTT, SG, and HAG performed the data collection and analysis. LTT, SG, HAG and MGP interpreted the data and drafted the manuscript. All authors edited, revised, and approved the final version. MGP was the chief investigator for the study.
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Thomeer, L., Guan, S., Gray, H. et al. Six-Degree-of-Freedom Tibiofemoral and Patellofemoral Joint Motion During Activities of Daily Living. Ann Biomed Eng 49, 1183–1198 (2021). https://doi.org/10.1007/s10439-020-02646-2
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DOI: https://doi.org/10.1007/s10439-020-02646-2