Wear of materials used for artificial joints in total hip replacements

Adhesive forces and surface properties of cold gas plasma treated UHMWPE

“…For example, UHMWPE is used in spine disk replacement [9] , as a concave bearing material in the acetabular cup in the hip, and as the tibial tray in the knee; with the opposite bearing surface traditionally made of hard but very smooth ceramic (alumina, zirconia, hydroxyapatite/calcium phosphate) or metal (stainless steel, titanium and alloys, cobalt and alloy materials. Other polymers (polyethylene, polypropylene, polyurethane, poly-methyl methacrylate) [10] in combination with metal/alloys (nickel–titanium; cobalt–chromium) are also used as they have good mechanical and surface properties when employed together [11] . However, the true success of UHMWPE lies in the fact that it is biocompatible [11] , with good low friction properties, chemical inertness, high impact strength and sufficient mechanical performance [12–14] .…”

State of the art of bioimplants manufacturing: part II

“…8. Such ball-onflat contact design has been successfully applied to studying the basic wear and frictions of metal-polymer and ceramic-polymer knee pairs [132,133]. Again, attention should be paid to the fact that the enhanced walking cycle, such as ascending the stairs, is more aggressive than the standard walking cycle, which may increase approximately Fig.…”

Comportement à l’usure et au frottement de deux biomatériaux AISI 316L et Ti-6Al-7Nb pour prothèse totale de hanche

“…À des faibles charges, l'abrasion est observée, et avec l'augmentation de la charge appliquée le mécanisme d'usure par délamination et par fatigue apparaît. Plusieurs auteurs [18][19][20] ont expliqué que, dans le cas des charges élevées, le délaminage est le mécanisme d'usure principal. Deux mécanismes d'usure ont été constatés : la délamination avec une faible sévérité et l'usure oxydative [21,22].…”