A Nicholls1, J Jacoby2, R Hartley3, D O'Connor3. 1. Department of Trauma and Orthopaedics, Poole Hospital NHS Trust, Poole BH15 2JB, UK alexnicholls@doctors.org.uk. 2. Department of Radiology, Poole Hospital NHS Trust. 3. Department of Trauma and Orthopaedics, Poole Hospital NHS Trust, Poole BH15 2JB, UK.