Tribological characterisation of UHMWPE used in dual mobility total hip prosthesis

Total hip arthroplasty represents an effective solution for bone and joint diseases. Nevertheless, the hip prosthesis has a limited lifetime, in the average around fifteen years. Their improvement, especially their dual mobility is the objective of this study. Therefore, our strategy is focused on i...

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Bibliographic Details
Main Authors: Essefi, I., Hakkouna, H, Ouenzerfi, G, Mollon, G, Hamza, S., Renault, E, Berthier, Y, Trunfio-Sfarghiu, A-M
Format: Conference Proceeding
Language:English
Subjects:
Accommodation
Atomic force microscopy
Biomedical materials
Contact angle
Cross-linked polyethylene
Fluorescence
Joints (anatomy)
Microscopes
Microscopy
Prostheses
Tribology
Ultra high molecular weight polyethylene
Wear mechanisms
Wear particles
Wear rate
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Summary:Total hip arthroplasty represents an effective solution for bone and joint diseases. Nevertheless, the hip prosthesis has a limited lifetime, in the average around fifteen years. Their improvement, especially their dual mobility is the objective of this study. Therefore, our strategy is focused on improving the material by comparing three types of polyethylene to determine the best one from a friction mechanism and wear rate minimization standpoint. A dual mobility hip prosthesis, containing a two-sided steel and cobalt chrome cup, was tested with a TORNIER hip joint simulator in calf serum. The rubbed surfaces were characterized using scanning electron microscopy (SEM), contact angle measurements, atomic force microscopy (AFM) and confocal fluorescence microscopy. All these multiscale characterization techniques (from nanoscale to millimeter and micro- scale) showed that the velocity accommodation mechanism is different from one type of polyethylene to another. The wear in the case of standard polyethylene was noticeable and the particles were large and scattered between the surface of polyethylene, the surface of the cup and in the calf serum. For the crosslinked polyethylene, the particles coming from the wear, were not as large, but they were spread the same way as the first case. Even though it shares the same accommodation principle on the detachment of the material with the crosslinked polyethylene the wear particles for the crosslinked vitaminized polyethylene were large and they were only found on the surface of the polyethylene.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/147/1/012014