Abstract
The reduction of tissue reactions in an artificial joint composed of an ultra-high molecular weight polyethylene sliding on a Co-Cr-Mo alloy, was investigated. To control the specific wear rate and morphological features of wear debris of the polyethylene, micro slurry-jet erosion was used as a precision machining method for the bearing surface of a Co-Cr-Mo alloy. This method constitutes a type of wet blasting technique, which uses alumina particles as an abrasive medium, along with compressed air and water, to create textured surfaces. Pin-on-disc wear tests, involving multidirectional sliding motion, resulted in a decrease in the polyethylene wear and changes in the morphological features. Primary human peripheral blood mononuclear phagocytes were incubated with the debris, and the wear debris generated on the textured surface changed the secretion of the IL-6 proinflammatory cytokines. We concluded that appropriate surface geometry contributed to prolong the service life of artificial joints.
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