Theodoros H Tosounidis1, Peter V Giannoudis2. 1. Academic Department of Trauma & Orthopaedic Surgery, Leeds General Infirmary, Leeds LS1 3EX, UK; Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK. Electronic address: ttosounidis@yahoo.com. 2. Academic Department of Trauma & Orthopaedic Surgery, Leeds General Infirmary, Leeds LS1 3EX, UK; Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK.