1 Department of Orthopaedics and Traumatology, Regina Montis Regalis Hospital, ASL CN1, Via S. Rocchetto, 99, 12084, Mondovì, CN, Italy.
2 Department of Orthopaedics and Traumatology, Orthopaedic and Trauma Centre, Città della Salute e della Scienza di Torino, University of Turin, Via Zuretti 29, 10121, Turin, Italy.
3 Department of Orthopaedics and Traumatology, Regional Center for Joint Arthroplasty, ASO Alessandria, Via Venezia 16, 16121, Alessandria, Italy.
4 Orthopaedic Clinic, Department of Surgical Sciences (DISC), University of Genoa, Ospedale Policlinico San Martino, Largo Rosanna Benzi 10, 16132, Genoa, Italy.
5 Department of Orthopaedics and Traumatology, Regional Center for Joint Arthroplasty, ASO Alessandria, Via Venezia 16, 16121, Alessandria, Italy. gabriele.colo@yahoo.it.