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Finite Element Method Oriented Failure Analysis of Medical Implants: Artificial Knee
Sivarasu S, James S.P, Mathew T.L.
Published in American Society of Mechanical Engineers
The application of Finite Element Modelling in Medical Applications has been evolving as the field of high importance especially in the development of medical devices. The Total Knee Arthroplasty [TKA] has been in existence for over 6 decades till now. The generic artificial knee implants used in the TKA have the restriction in its range of motion with around 90 degrees. A new design allowing flexion extension range of over 120 degrees was designed with a view to facilitate partial squatting and the same is used for the analysis purpose. The new design of the artificial knee has a flexion extension range of 130 degrees. The higher flexion of the knee is obtained by use of the rotating platform knee design principle and also by adopting a multi-radii approach for the femoral component design. The loading conditions of 10 times the body weight are considered for structural analyses of the novel knee. A maximum load of 700Kg were subjected on the knee implants. The finite element analyses of the designs were carried out based on standard biomaterial used in orthopedic implants. In this paper we have discussed the results of analyses of an artificial knee with Ti alloy. The results of the analyses were used in identifying areas of extreme stresses within the design and the spot prone for higher deformation. Based on these results slight modification on the designs was carried out. The results are also verified whether the body is within the linear deformation levels. As the results obtained were very satisfactory the models have been recommended for prototyping.
About the journal
JournalASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation
PublisherAmerican Society of Mechanical Engineers
Open Access0