Erratum: robotic Arthroplasty Clinical and cost Effectiveness Randomised controlled trial (RACER-knee): a study protocol (BMJ Open (2023) 13: (e068255) DOI: 10.1136/bmjopen-2022-068255)

Following publication of this article in June 2023 the study team became aware of an omission from the description of outcome measures used in the study. The section regarding process outcomes assessed in the RACER‐Knee study had been inadvertently omitted. The outcomes are listed in their complete form in the full study protocol and are now consistent between the article and the full study protocol. The additional text inserted was at the end of the Secondary Outcomes section in a self‐contained sub‐section called Process Measures.