title: Enhanced wear and corrosion in modular tapers in total hip replacement is associated with the contact area and surface topography.
abstract: Widespread concern exists about adverse tissue reactions after metal-on-metal (MoM) total hip replacement (THR). Concerns have also been expressed with wear and corrosion of taper junctions in THR. We report the effect of surface finish and contact area associated with a single combination of materials of modular tapers. In an in vitro test, we investigated the head/neck (CoCrMo/Ti) interface of modular THRs using commercially available heads. Wear and corrosion of taper surfaces was compared following a 10 million loading cycle. Surface parameters and profiles were measured before and after testing. Electrochemical static and dynamic corrosion tests were performed under loaded and non-loaded conditions. After the load test, the surface roughness parameters on the head taper were significantly increased where the head/neck contact area was reduced. Similarly, the surface roughness parameters on the head taper were significantly increased where rough neck tapers were used. Corrosion testing showed breaching of the passive film on the rough but not the smooth neck tapers. Thus, surface area and surface finish are important factors in wear and corrosion at modular interfaces.
authors: Institute of Orthopaedics and Musculo-Skeletal Science, University College London and the Royal National Orthopaedic Hospital, Stanmore, Middlesex, HA7 4LP, United Kingdom.
authors: Anna
authors: A
authors: Panagiotidou
authors: Jay
authors: J
authors: Meswania
authors: Jia
authors: J
authors: Hua
authors: Sarah
authors: S
authors: Muirhead-Allwood
authors: Alister
authors: A
authors: Hart
authors: Gordon
authors: G
authors: Blunn
mesh_terms: D000497:Alloys / Q000737:chemistry*; D019644:Arthroplasty, Replacement, Hip; D002857:Chromium / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003343:Corrosion; D004563:Electrochemistry; D006622:Hip Prosthesis; D006801:Humans; D008982:Molybdenum / Q000737:chemistry; D011474:Prosthesis Design; D013499:Surface Properties
chemical_list: D000497:Alloys; D002857:Chromium; D003035:Cobalt; D008982:Molybdenum
keywords: corrosion; metal on metal; modular taper; total hip replacement; wear