1. Department of Radiology, Whitty Bldg, N Circular Rd, Mater Misericordiae University Hospital, Dublin D07 R2WY, Ireland.
2. Department of Orthopaedic Surgery, Mater Misericordiae Hospital, Dublin, Ireland.
3. Emergency Department, Mater Misericordiae University Hospital, Dublin, Ireland.
4. School of Medicine, University College Dublin, Dublin, Ireland.