title: A novel tribological study on DLC-coated micro-dimpled orthopedics implant interface.
abstract: This study investigates a tribological performance of diamond like carbon (DLC) coated micro dimpled prosthesis heads against ceramic cups in a novel pendulum hip joint simulator. The simulator enables determining friction coefficient and viscous effects of a concave shaped specimen interface (conformal contact). Two types of DLC such as hydrogenated amorphous carbon (a-C:H) and tetrahedral amorphous carbon (Ta-C) and one set of micro dimple (diameter of 300µm, depth of 70µm, and pitch of 900µm) were fabricated on metallic prosthesis heads. The experiment results reveal a significant friction coefficient reduction to the 'dimpled a-C:H/ceramic' prosthesis compared to a 'Metal (CoCr)/ceramic' prosthesis because of their improved material and surface properties and viscous effect. The post-experiment surface analysis displays that the dimpled a-C:H yielded a minor change in the surface roughness, and generated a larger sizes of wear debris (40-200nm sized, equivalent diameter), a size which could be certainly stored in the dimple, thus likely to reducing their possible third body abrasive wear rate. Thus, dimpled a:C-H can be used as a 'metal on ceramic hip joint interface', whereas the simulator can be utilized as an advanced bio-tribometer.
authors.affiliation: Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic; CEITEC-Central European Institute of Technology, Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic. Electronic address: Dipankar.choudhury78@gmail.com.
authors.forename: Dipankar
authors.initials: D
authors.lastname: Choudhury
authors.affiliation: Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic.
authors.forename: Filip
authors.initials: F
authors.lastname: Urban
authors.affiliation: Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic; CEITEC-Central European Institute of Technology, Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Vrbka
authors.affiliation: Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Hartl
authors.affiliation: Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic; CEITEC-Central European Institute of Technology, Brno University of Technology, Technická 3058/10, 616 00 Brno, Czech Republic.
authors.forename: Ivan
authors.initials: I
authors.lastname: Krupka
mesh_terms: D018130:Diamond; D017276:Friction; D006621:Hip Joint; D008422:Materials Testing; D055595:Mechanical Phenomena; D009985:Orthopedics; D019736:Prostheses and Implants; D013499:Surface Properties
chemical_list: D018130:Diamond
keywords: Diamond like carbon; Friction coefficient; Hip joint prosthesis; Micro dimple; Wear debris