1. Department of Orthopaedic and Trauma Surgery, Hairmyres Hospital, Eaglesham Road, East Kilbride G75 8RG, UK.
2. Scottish Hip Fracture Audit Healthcare Information Group, Information Services Division, NHS National Services, Scotland, Gyle Square, 1 South Gyle Crescent, Edinburgh EH12 9EB, UK.
3. Department of Surgery and Orthopaedics, University of Aberdeen Medical School, Polwarth Building, Foresterhill, Aberdeen AB25 2ZD, UK.