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Journal of Healthcare Engineering
Volume 2017, Article ID 1496379, 8 pages
Research Article

A Numerical Investigation into the Effects of Overweight and Obesity on Total Knee Arthroplasty

1Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2School of Engineering and Informatics, University of Sussex, Brighton BN1 9QJ, UK
3Bioengineering Science Research Group, University of Southampton, Southampton SO17 1BJ, UK

Correspondence should be addressed to Yuan Guo; moc.361@0891tuytnauyoug

Received 23 February 2017; Accepted 12 April 2017; Published 29 May 2017

Academic Editor: Jie Yao

Copyright © 2017 Changjiang Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Overweight and obesity increase risks of knee osteoarthritis, which is a major cause of disability. Severe knee osteoarthritis can be treated by knee arthroplasty. Total knee arthroplasty has been used in overweight and obese patients; however, clinical reports showed that the outcome of this group of patients was not good as normal-weight patients. Two computer models were created in this paper to simulate the effect of excess loads on the distal femoral bone and contact pressures in total knee arthroplasty during a gait cycle. The numerical results showed increased stress in periprosthetic distal femoral bones and higher contact pressure on tibial polyethylene insert during the stance phase. Based on the computer simulation results and published research work, cementless total knee arthroplasty with thicker tibial polyethylene insert may be a better option for overweight patients.