title: Scratching vulnerability of conventional vs highly cross-linked polyethylene liners because of large embedded third-body particles.
abstract: The hypothesis of this study was that acetabular liner vulnerability to scratching from femoral heads, roughened by third bodies embedded in the liner, is not significantly lower for highly cross-linked polyethylene (HXPE) than for conventional polyethylene (CPE). Six CPE and 6 HXPE acetabular liners were each reproducibly embedded with 5 cobalt-chromium-molybdenum (CoCrMo) beads then run for 10,000 cycles in a joint simulator. By visual rank ordering, there was low association between liner scratch severity and polyethylene type. The CPE and HXPE liner scratches were not significantly different in scratch peak-valley height or width or in liner roughness in the vicinity of the embedded beads. This model indicated that high cross-linking of polyethylene does not offer appreciable protection against severe scratching induced by large embedded third-body particles.
authors: Biomechanics Laboratory, Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa 52242, USA.
authors: Anneliese D
authors: AD
authors: Heiner
authors: Alison L
authors: AL
authors: Galvin
authors: John
authors: J
authors: Fisher
authors: John J
authors: JJ
authors: Callaghan
authors: Thomas D
authors: TD
authors: Brown
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D019544:Equipment Failure Analysis; D005547:Foreign Bodies / Q000150:complications*; D006621:Hip Joint / Q000503:physiopathology; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing; D010316:Particle Size; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013499:Surface Properties
chemical_list: D020959:Polyethylene