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Contributors All authors have made substantial contributions to the conception, design, acquisition, analysis and interpretation of data. All authors have revised it critically for important intellectual content and approved the final version. In doing so, we agree to be accountable for all aspects of the work.
Disclaimer The views expressed are those of the authors and not necessarily those of the NHS, the NIHR or the Department of Health.
Competing interests AR’s department has received educational and research grants from DePuy that are outside the scope of this work. NEF is an NIHR Senior Investigator.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement There are no unpublished data.