title: Biotribological study of large diameter ceramic-on-CFR-PEEK hip joint including fluid uptake, wear and frictional heating.
abstract: A novel material combination of a large diameter Biolox(®) Delta zirconia-toughened-alumina (ZTA) head and a pitch-based carbon fibre reinforced poly ether-ether-ketone (CFR-PEEK) MOTIS(®) cup has been studied. The acetabular cups were inclined at three angles and tested using Durham Hip Simulators. The different inclination angles used did not have a significant effect on the wear rates (ANOVA, p = 0.646). Averaged over all cups, the wear rates were calculated to be 0.551 ± 0.115 mm(3)/10(6) cycles and 0.493 ± 0.107 mm(3)/10(6) cycles taking into account two types of soak controls; loaded at room temperature and unloaded at 37 °C respectively. Averaged across all femoral heads, the wear rate was 0.243 ± 0.031 mm(3)/10(6) cycles. The temperature change of the lubricant caused by the frictional heat was measured in situ. Friction factors measured using the Durham Friction Simulator were lower for the worn CFR-PEEK cups compared with unworn. This correlated with the decreased surface roughness. Even though relatively high friction was observed in these hemispherical hard-on-soft bearings, the wear rate is encouragingly low.
authors.affiliation: School of Engineering and Computing Sciences, Durham University, Durham, UK.
authors.forename: Qian Qian
authors.initials: QQ
authors.lastname: Wang
authors.forename: Jun Jie
authors.initials: JJ
authors.lastname: Wu
authors.forename: Anthony
authors.initials: A
authors.lastname: Unsworth
authors.forename: Adam
authors.initials: A
authors.lastname: Briscoe
authors.forename: Marcus
authors.initials: M
authors.lastname: Jarman-Smith
authors.forename: Conor
authors.initials: C
authors.lastname: Lowry
authors.forename: David
authors.initials: D
authors.lastname: Simpson
authors.forename: Simon
authors.initials: S
authors.lastname: Collins
mesh_terms: D000042:Absorption; D000537:Aluminum Oxide; D001577:Benzophenones; D001672:Biocompatible Materials / Q000009:adverse effects* / Q000737:chemistry*; D001696:Biomechanical Phenomena; D001826:Body Fluids / Q000502:physiology; D002244:Carbon; D000077482:Carbon Fiber; D002516:Ceramics; D019544:Equipment Failure Analysis / Q000379:methods; D017276:Friction; D006622:Hip Prosthesis; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D066298:In Vitro Techniques; D007659:Ketones; D018625:Microscopy, Atomic Force; D011092:Polyethylene Glycols; D011108:Polymers; D011475:Prosthesis Failure; D013499:Surface Properties; D015040:Zirconium
chemical_list: D001577:Benzophenones; D001672:Biocompatible Materials; D000077482:Carbon Fiber; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols; D002244:Carbon; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide