Guest Editor: Ting Cong, MD (Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA)

Guest Editor: Justin W. Arner, MD (Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA)

Guest Editors: Giuseppe Solarino (Associate Professor in Orthopedics and Traumatology, University of Bari, Italy) and Giuseppe Marongiu (Assistant Professor in Orthopedics and Traumatology, University of Cagliari, Italy)

Guest Editors: Nemandra A Sandiford(Consultant, Joint Reconstruction Unit, Southland Teaching Hospital, Southern District Health Board, Invercargill, New Zealand) and Daniel Kendoff (Department of Orthopaedic Surgery, Helios ENDO-Klinik, Hamburg, Germany)