Journal
MEDICAL ENGINEERING & PHYSICS
Volume 49, Issue -, Pages 109-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2017.08.007
Keywords
Numerical and experimental modal analysis; Total knee replacement; Tibial implant loosening detection; Finite element analysis
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Funding
- IWT (Agency for Technology and Innovation, Flanders) [SB 81092]
- KU Leuven Impulse Fund [IMP/14/050]
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The preoperative diagnosis of loosening of cemented tibial knee implants is challenging. This feasibility study explored the basic potential of a vibration-based method as an alternative diagnostic technique to assess the fixation state of a cemented tibia implant and establish the method's sensitivity limits. A combined in vitro and in silico approach was pursued. Several loosening cases were simulated. The largest changes in the vibrational behavior were obtained in the frequency range above 1500 Hz. The vibrational behavior was described with two features; the frequency response function and the power spectral density band power. Using both features, all experimentally simulated loosening cases could clearly be distinguished from the fully cemented cases. By complementing the experimental work with an in silico study, it was shown that loosening of approximately 14% of the implant surface on the lateral and medial side was detectable with a vibration-based method. Proximal lateral and medial locations on the tibia or locations toward the edge of the implant surface measured in the longitudinal direction were the most sensitive measurement and excitation locations to assess implant fixation. These results contribute to the development of vibration-based methods as an alternative follow-up method to detect loosened tibia implants. (C) 2017 IPEM. Published by Elsevier Ltd. All rights reserved.
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