Eduardo García-Rey received his M.D. from the University Autónoma of Madrid in 1997, interned at Hospital Universitario 12 de Octubre in Madrid from 1998 and 2003 and then entered the Orthopaedic Surgery Department at Fundación Hospital Alcorcón in Madrid form 2003 to 2006. Since 2006 he does his daily professional activity at Hospital Universitario La Paz in Madrid. Dr. García-Rey is also Associate Professor of Orthopaedic Surgery at the Universidad Autónoma of Madrid since 2011 and member of the Orthopaedic Surgery Group within the Research, Development and Innovation Institute at Hospital La Paz (Idi Paz) since 2010. He is involved in National and European Research Projects. Dr García–Rey is a member, among others, of the European Hip Society (EHS), Spanish Hip Surgery Society, European Orthopaedic Research Society and the International Society for Technology in Arthroplasty. Recently, he has been selected, from EHS 2017 Guest Society, to participate in the AmericanAssociation of Hip and Knee Surgeons Travelling Fellowship. He published chapters on primary and revision surgery of the hip and 30 peer-reviewed papers in English literature as primary or second author of which most are related to primary or revision total hip replacement. Eduardo García Cimbrelo received his MD from the University Complutense of Madrid in 1970, interned at Hospital La Paz in Madrid, and then entered the Orthopaedic Surgical Training Programme of the Hospital associated with the University Autónoma of Madrid. Dr. García-Cimbrelo became Chief of the Hip Arthroplasty and Revision Surgery Section in 1992, and became Head of Orthopaedic Surgery and Trauma, Hospital La Paz in 2005 where he continues presently. He is a full time orthopaedic surgeon in the Division of Orthopaedic Surgery at Hospital La Paz and was Associate Professor of Orthopaedic Surgery at the Universidad Autónoma of Madrid until 2012. Dr García Cimbrelois a Founder-Member of the European Hip Society which was founded in October 1992, and was President of the EHS from 2006 to 2008. He is also Full-Member of the International Hip Society since 2002. Dr. Garcia-Cimbrelo has published books, chapters on primary and revision surgery of the hip and 47 peer-reviewed papers in English literature as primary or second author. Most are related to primary total hip arthroplasty, complications of THA and revision revision arthroplasty of the hip.