Timothy O White, BMedSci, MBChB, FRCSEd (Tr &Orth), MD, Consultant in Orthopaedic Trauma Surgery, Royal Infirmary of Edinburgh; Honorary Senior Lecturer in the Department of Orthopaedic and Trauma Surgery, University of Edinburgh; Samuel P Mackenzie, BMed Sci, MBChB, MRCS, Specialty Trainee, Trauma and Orthopaedic, Royal Infirmary of Edinburgh; Honorary Teaching Fellow, University of Edinburgh