Received: 5 October 2017
Accepted: 25 January 2018
First Online: 6 February 2018
Ethics approval and consent to participate
: This retrospective clinical audit was conducted with local institutional review board (IRB) approval from the Clinical Effectiveness Committee, Clinical Governance and Risk Neurosciences, Orthopaedics, Trauma and Specialist Surgery (NOTSS) Division, Oxford University Hospitals NHS Foundation Trust (Datix registration no. 4916). Permission was given to access patient data, which were de-identified.
: Not Applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.