Nick A. Aresti MBBS BSc (Hons) MRCS Specialist Registrar in Trauma & Orthopaedic SurgeryPercivall Pott Rotation, LondonMatthew Barry MS FRCS (Orth)Consultant Paediatric Orthopaedic SurgeonBarts Health NHS TrustHonorary Senior Lecturer, School of Engineering and Materials Science, Queen Mary University of LondonJohn MH Paterson FRCSConsultant Paediatric Orthopaedic SurgeonThe Royal London, Barts and The London Children's Hospitals, Barts Health NHS TrustManoj Ramachandran BSc (Hons) MBBS (Hons) MRCS (Eng) FRCS (Tr&Orth)Consultant Orthopaedic and Trauma Surgeon (Paediatric and Young Adult)The Royal London & Barts and The London Children's Hospitals, BartsHealth NHS Trust, LondonHonorary Reader, School of Engineering and Material Sciences, QueenMary, University of London