Paolo Spinnato1, Giancarlo Facchini2, Alberto Bazzocchi2, Ugo Albisinni2. 1. Diagnostic and Interventional Radiology, "Rizzoli" Orthopaedic Institute, Via G.C. Pupilli n. 1, 40136, Bologna, BO, Italy. paolo.spinnato1982@gmail.com. 2. Diagnostic and Interventional Radiology, "Rizzoli" Orthopaedic Institute, Via G.C. Pupilli n. 1, 40136, Bologna, BO, Italy.