Effect of type of contact, counterface surface roughness, and contact area on the wear and friction of extensively cross-linked, vitamin E stabilized UHMWPE
Novel extensively cross-linked, vitamin E stabilized polyethylene (VEXLPE) materials are expected to provide improved wear and oxidation resistance in orthopedic implants. Noncyclic, multidirectional pin-on-disk (POD) wear tests were performed for VEXLPE with flat-on-flat (FoF) and ball-on-flat (BoF) specimen configurations against CoCr counterfaces of varying surface roughness (Sa = 0.02–0.74 μm). In addition, wear tests (FoF) were performed for VEXLPE pins of varying nominal contact area (7.07–113 mm2) with consistent load regimen against polished CoCr disks. All specimen couples were also friction tested with a multidirectional, circularly translating POD device. In all tests, calf serum was used as the lubricant. In comparison with earlier, similar tests for conventional, gamma-sterilized ultra-high molecular weight polyethylene (UHMWPE) and for extensively cross-linked, heat treated UHMWPE (XLPE), the tribological findings for the present VEXLPE appeared promising with respect to its possible clinical use in prosthetic joints, particularly as an acetabular liner against large-diameter femoral heads, and in nonconforming contacts. Contrary to the well-known, paradoxical behavior of conventional UHMWPE, the VEXLPE wear factor decreased with increasing contact area.
|Julkaisu||Journal of Biomedical Materials Research - Part B Applied Biomaterials|
|Tila||Julkaistu - 13 joulukuuta 2019|
|OKM-julkaisutyyppi||A1 Julkaistu artikkeli, soviteltu|