Michael Papadakis1, Aggeliki Lianou2, Vasileios S Nikolaou1. 1. 2nd Department of Orthopaedics, University of Athens, 2-4 Agias Olgas Street, Nea Ionia, 14233 Athens, Greece. 2. Department of Radiology, Konstantopouleio Hospital, 2-4 Agias Olgas Street, Nea Ionia, 14233 Athens, Greece.