Joseph C. McCarthy, MDOrthopedic Surgery, Hip Joint Arthroplasty/Hip ArthroscopyMassachusetts General Hospital Boston, MA, USAOrthopedic SurgeryDirector, Kaplan Joint CenterNewton-Wellesley HospitalNewton, MA, USAPhilip C. Noble, BE, MEngSci, PhDDirector of ResearchInstitute of Orthopedic Research and EducationHouston, TX, USAOrthopedic ResearchJoseph Barnhart Department of Orthopedic Surgery Baylor College of MedicineHouston, TX, USARichard N. Villar, MSc(Hons), MA, FRCSConsultant Orthopedic SurgeonOrthopedicsThe Villar Bajwa PracticeSpire Cambridge Lea HospitalCambridge, UK