• The ACORN is a multicentre registry that aims to improve the quality and effectiveness of joint replacement surgery by monitoring and evaluating patient reported clinical outcomes after surgery.
  • The registry will enable improvements in care by:
  • * Identifying characteristics and co-morbidities that place people at risk of poor outcome after joint replacement
  • * Monitoring rates of key complications, such as VTE and infection, that require management, reoperation or hospital readmission
  • * Providing a better understanding of the relationship between co-morbidities and other potential risk factors, and outcomes
  • * Identify high performing sites and investigate reasons for superior outcomes
  • * Identify and investigate variation in patient-reported outcomes to improve understanding of differences
  • * Use data to improve the quality of arthroplasty surgery


ACORN was established in 2012 to provide information on the patient-relevant outcomes of joint replacement surgery. ACORN collects information directly from patients about their expectations of surgery and the actual outcomes of their hip or knee replacement. Specifically, ACORN was designed to provide standardised, reliable and near-complete information from multiple hospitals, and to use this information to drive improvement by informing future decision making by the public, surgeons, and hospitals.

ACORN has developed guidelines and protocols around data collection and dissemination, and a Lead Human Research Ethics Committee has approved the project. In the future, it may be possible to compare the patient reported outcomes across similar sites.

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