Martyn J Parker1, Antony Johansen2, Richard Griffiths3. 1. Peterborough and Stamford Hospital NHS Foundation Trust, Department of Orthopaedics, Peterborough City Hospital, CBU PO Box 211, Bretton Gate, Peterborough, PE3 9GZ, UK. Electronic address: Martyn.parker1@nhs.net. 2. University Hospital of Wales, Cardiff, CF14 4XW, UK; National Hip Fracture Database (NHFD), Royal College of Physicians, London, UK. Electronic address: antony.johansen@wales.nhs.uk. 3. Peterborough and Stamford Hospital NHS Foundation Trust, Peterborough City Hospital, UK. Electronic address: richardgriffiths1@nhs.net.