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Journal of Long-Term Effects of Medical Implants
SJR: 0.332 SNIP: 0.491 CiteScore™: 0.89

ISSN Print: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2016014007
pages 89-95

Effect of Modularity on the Fatigue Performance of Tibial Tray Designs in TKA Prostheses

Ahilan Anantha Krishnan
Department of Aerospace Engineering, IIT Bombay, 400076, India
Rupesh Ghyar
Biomedical Engineering and Technology (Incubation) Centre, IIT Bombay, 400076, India
Bhallamudi Ravi
Department of Mechanical Engineering, IIT Bombay, 400076, India


Fatigue performance of tibial tray in total knee arthroplasty (TKA) is of critical importance in terms of longevity of the prosthesis. Standards have been proposed by American Society for Testing and Materials (ASTM) and International Organization for Standardization (ISO) to ensure its long-term structural integrity. The aim of the current study is to evaluate the effect of modularity in the tibial tray following the testing standards, using finite element analysis. Goodman and Sines criteria were used to compare the fatigue safety factor (FSF) of four modular designs versus the two conventional designs. Cruciate-retaining (CR) type modular tibial tray designs were better than posterior-stabilized (PS) type tibial tray designs. More cutouts in the tray and absence of keel were reasons for poor fatigue performance.