1. Department of Trauma and Orthopaedic Surgery, Keele University School of Medicine, North Staffordshire Hospital, Staffordshire, England
2. Department of Sports Traumatology, Dynamic Center, Angri, Italy
3. Department of Orthopaedics and Traumatology, University of Napoli, Napoli, Italy
4. Rehabilitation Unit, Divisione di Lungodegenza, S. Nicola Baronia, Avellino, Italy