Benjamin Joseph, MS (Orth), MCh Orth, FRCS Ed, adjunct professor of paediatric orthopaedics, Christian Medical College, Vellore, India; and consultant paediatric orthopaedic surgeon Aster Medcity, Kochi, IndiaSelvadurai Nayagam, BSc, MCh(Orth), FRCS Ed (Trauma and Orth), consultant orthopaedic surgeon, Royal Liverpool Children's Hospital; and honorary reader, University of Liverpool, UKRandall T. Loder, MD, garceau professor of orthopaedic surgery, Indiana University School of Medicine, Indianapolis; and chief of orthopaedics, James Whitcomb Riley Children’s Hospital, Indianapolis, USAIan Torode, MBBS, FRCS (C), FRACS, former director of clinical orthopaedics and deputy director of orthopaedics, Royal Children's Hospital, Melbourne, Australia