Metal/Metal Bearing Surface in Total Conventional Hip Arthroplasty Supplementary Report
Authors:   Australian Orthopaedic Association National Joint Replacement Registry, Smith Paul N. ,   Australian National University Medical School, Gill David R.J. ,   Australian Orthopaedic Association National Joint Replacement Registry, McAuliffe Michael J. ,   Australian Orthopaedic Association National Joint Replacement Registry,   Queensland University of Technology, McDougall Catherine ,   Australian Orthopaedic Association National Joint Replacement Registry,   University of Queensland Medical School, Stoney James D. ,   Australian Orthopaedic Association National Joint Replacement Registry, Vertullo Christopher J. ,   Australian Orthopaedic Association National Joint Replacement Registry,   Griffith Centre of Biomedical and Rehabilitation Engineering, Griffith University,   Knee Research Australia, Wall Christopher J. ,   Australian Orthopaedic Association National Joint Replacement Registry,   University of Queensland Rural Clinical School, Corfield Sophia ,   Australian Orthopaedic Association National Joint Replacement Registry, Cashman Kara ,   South Australian Health and Medical Research Institute, Cuthbert Alana R. ,   South Australian Health and Medical Research Institute, Du Peiyao ,   South Australian Health and Medical Research Institute, Harries Dylan ,   South Australian Health and Medical Research Institute, Holder Carl ,   South Australian Health and Medical Research Institute, Lorimer Michelle F. ,   South Australian Health and Medical Research Institute, Lewis Peter L. ,   Australian Orthopaedic Association National Joint Replacement Registry,   University of Adelaide Medical School
Published: September 2023

This report provides information on total conventional hip replacement procedures performed with metal/metal bearing surfaces. All hip replacement procedures recorded by the Registry from the commencement date to 31 December 2022 have been included in this report. Summary data on the use of metal/metal bearings are provided, along with outcomes (revision rate, reason for revision and type of revision) according to patient and implant characteristics (e.g. head size, age and gender). The use of metal/metal conventional hip replacements peaked between 2006 and 2008 (when over 3,000 were implanted each year) and then rapidly declined, with no metal/metal THRs implanted since 2016. The revision rate for metal/metal THRs is higher than for other bearing surfaces, but the high revision rate is mainly restricted to prostheses with head sizes >32mm. The most common reason for revision of a primary metal/metal hip replacement is metal related pathology, followed by loosening and infection. This Report is one of 16 supplementary reports to complete the AOANJRR Annual Report for 2023. Information on the background, purpose, aims, benefits and governance of the Registry can be found in the Introductory chapter of the 2023 Hip, Knee and Shoulder Arthroplasty Annual Report. The Registry data quality processes including data collection, validation and outcomes assessment, are provided in detail in the Data Quality section of the introductory chapter of the 2023 Hip, Knee and Shoulder Arthroplasty Annual Report: https://aoanjrr.sahmri.com/annual-reports-2023.