1 Orthopaedic and Trauma Clinic I, Rizzoli Orthopaedic Institute, University of Bologna, Via Pupilli 1, 40136, Bologna, Italy.
2 Orthopaedic and Trauma Clinic I, Rizzoli Orthopaedic Institute, University of Bologna, Via Pupilli 1, 40136, Bologna, Italy. antonio.mazzotti2@studio.unibo.it.