Influence of surface profile of Co-28Cr-6Mo alloy on wear behaviour of ultra-high molecular weight polyethylene used in artificial joint. (February 2018)

• Record Type: Journal Article
• Authors: Nakanishi, Yoshitaka; Nakashima, Yuta; Fujiwara, Yukio; Komohara, Yoshihiro; Takeya, Motohiro; Miura, Hiromasa; Higaki, Hidehiko
• Is Part Of: Tribology international. Volume 118(2018)
• Page Start: 538
• Page End: 546
• Publication Date: 2018-02
• Subjects: Artificial joint -- Surface profile -- Wear -- Polyethylene -- Co-Cr-Mo alloy -- Macrophage activation; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2017.06.030
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The influence of the surface profile of Co-28Cr-6Mo alloy (ASRM F75) on the wear behaviour of ultra-high molecular weight polyethylene (GUR1050) was investigated using pin-on-disc wear testing. The surface profile of Co-Cr-Mo alloy was designed to control not only the volume of wear of polyethylene but also the morphological features of the wear debris. The surface profile of Co-Cr-Mo alloy showed a surface roughness from the micrometre to nanometre scale, and a waviness curve with convex and concave parts of millimetres in size. The surface processing was conducted using micro slurry-jet erosion. The processed surface of Co-Cr-Mo alloy recorded the lowest wear rate of polyethylene in comparison with a conventional mirror finish surface. The equivalent circle diameter of the polyethylene wear particles from the processed surface was more than two-times larger than that using a conventional mirror finish surface. It was revealed that the larger debris group produced by the processed surface was able to reduce the secretion of IL-6 from macrophage activation during biochemistry tests. The results illustrate the possibility of controlling the major factors in the long-term osteolysis and loosening of artificial joints through the use of a surface modification of a Co-Cr-Mo alloy surface. Highlights: The influence of the surface profile of Co-Cr-Mo alloy on the wear behaviour of polyethylene was investigated. The surface profile was designed to control the volume of wear of the polyethylene. The surface profile was also designed to control the morphological features of the wear debris of the polyethylene. The results provide the possibility of controlling the major factors in the long-term loosening of artificial joints.