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Published on: May 14, 2020
Time-dependent elastohydrodynamic lubrication analysis of total knee replacement under walking conditions
Yonglin Su1, Peiran Yang, Zengliang Fu
1Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, P.R. China. sdjnsyl@sjtu.edu.cn
Computer Methods in Biomechanics and Biomedical Engineering
|March 11, 2011
Summary
This study analyzes artificial knee joint lubrication during walking. Findings show film thickness varies with walking phase, influenced by implant geometry and cycle duration, impacting joint longevity.
Area of Science:
- Biomedical Engineering
- Tribology
- Orthopedic Biomechanics
Background:
- Artificial knee joint lubrication is critical for clinical performance and component longevity.
- Understanding time-dependent elastohydrodynamic lubrication is essential for normal total knee replacements.
Purpose of the Study:
- To perform a time-dependent elastohydrodynamic lubrication analysis of artificial knee joints during normal walking.
- To investigate the influence of cyclic load and speed variations on knee joint lubrication.
Main Methods:
- An equivalent ellipsoid-on-plane model was used to represent an artificial knee.
- A numerical method solved Reynolds and elasticity equations using the multigrid technique.
- Constrained column model was used for elastic deformation analysis.
Main Results:
- Central film thickness decreased during the stance phase and remained higher during the swing phase.
- Entraining and squeeze-film actions significantly affected lubrication throughout the walking cycle.
- Implant geometry and cycle duration were identified as key factors influencing lubrication performance.
Conclusions:
- The study provides insights into the lubrication dynamics of artificial knee joints.
- Findings highlight the importance of implant design and gait cycle parameters for joint longevity.
- This analysis contributes to improving the design and performance of artificial knee replacements.
