title: Ten different hip resurfacing systems: biomechanical analysis of design and material properties.
abstract: This study gives an overview of the main macro- and microstructural differences of ten commercially available total hip resurfacing implants. The heads and cups of resurfacing hip implants from ten different manufacturers were analysed. The components were measured in a coordinate measuring machine. The microstructure of the heads and cups was inspected by scanning electron microscopy. The mean radial clearance was 84.86 microm (range: 49.47-120.93 microm). The implants were classified into three groups (low, medium and high clearance). All implants showed a deviation of roundness of less than 10 microm. It was shown that all implants differ from each other and a final conclusion about the ideal design and material combination cannot be given based on biomechanical data. Widespread use of specific designs can only be recommended if clinical long-term follow-up studies are performed and analysed for each design.
authors.affiliation: Laboratory of Biomechanics and Implant Research, Department of Orthopaedics, University of Heidelberg, Heidelberg, Germany. christian.heisel@ok.uni-heidelberg.de
authors.forename: Christian
authors.initials: C
authors.lastname: Heisel
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Kleinhans
authors.forename: Michael
authors.initials: M
authors.lastname: Menge
authors.forename: Jan Philippe
authors.initials: JP
authors.lastname: Kretzer
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D002244:Carbon; D006622:Hip Prosthesis; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D011474:Prosthesis Design
chemical_list: D002244:Carbon