title: Are all metal-on-metal hip revision operations contributing to the National Joint Registry implant survival curves? : a study comparing the London Implant Retrieval Centre and National Joint Registry datasets.
abstract: OBJECTIVE
  The National Joint Registry for England, Wales and Northern Ireland (NJR) has extended its scope to report on hospital, surgeon and implant performance. Data linkage of the NJR to the London Implant Retrieval Centre (LIRC) has previously evaluated data quality for hip primary procedures, but did not assess revision records.
  
  
  METHODS
  We analysed metal-on-metal hip revision procedures performed between 2003 and 2013. A total of 69 929 revision procedures from the NJR and 929 revised pairs of components from the LIRC were included.
  
  
  RESULTS
  We were able to link 716 (77.1%) revision procedures on the NJR to the LIRC. This meant that 213 (22.9%) revision procedures at the LIRC could not be identified on the NJR. We found that 349 (37.6%) explants at the LIRC completed the full linkage process to both NJR primary and revision databases. Data completion was excellent (> 99.9%) for revision procedures reported to the NJR.
  
  
  CONCLUSIONS
  This study has shown that only approximately one third of retrieved components at the LIRC, contributed to survival curves on the NJR. We recommend prospective registry-retrieval linkage as a tool to feedback missing and erroneous data to the NJR and improve data quality.
  
  
  CONCLUSIONS
  Prospective Registry - retrieval linkage is a simple tool to evaluate and improve data quality on the NJR.
authors.affiliation: Great Ormond Street Hospital for Children, London, UK.
authors.forename: S A
authors.initials: SA
authors.lastname: Sabah
authors.affiliation: Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.
authors.forename: J
authors.initials: J
authors.lastname: Henckel
authors.affiliation: University College London, Gower St, London WC1E 6BT, UK.
authors.forename: S
authors.initials: S
authors.lastname: Koutsouris
authors.affiliation: University College London, Gower St, London WC1E 6BT, UK.
authors.forename: R
authors.initials: R
authors.lastname: Rajani
authors.affiliation: University College London, Stanmore, HA7 4LP, UK.
authors.forename: H
authors.initials: H
authors.lastname: Hothi
authors.affiliation: Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.
authors.forename: J A
authors.initials: JA
authors.lastname: Skinner
authors.affiliation: University College London, Stanmore, HA7 4LP, UK.
authors.forename: A J
authors.initials: AJ
authors.lastname: Hart
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D004812:Epidemiologic Methods; D006801:Humans; D016247:Information Storage and Retrieval; D007258:Informed Consent; D061825:Metal-on-Metal Joint Prostheses / Q000592:standards / Q000706:statistics & numerical data*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation / Q000706:statistics & numerical data*; D006113:United Kingdom
keywords: arthroplasty; hip revision; joint registry; metal-on-metal; retrieval