1. Department of Orthopaedic and Trauma Surgery, Dundee Royal Infirmary, Barrack Road, Dundee DD1 9ND, UK.
2. Department of Orthopaedic and Trauma Surgery, Perth Royal Infirmary, Perth PH1 1NX, UK.
3. Department of Orthopaedic and Trauma Surgery, Stirling Royal Infirmary, Livilands, Stirling FK8 2AU, UK.