About the Author: ​ E. Carlos Rodríguez-Merchán is a Specialist in Orthopedic Surgery and Consultant Orthopedic Surgeon currently working at the Department of Orthopedic Surgery, La Paz University Hospital, Madrid, Spain. Dr. Rodríguez-Merchán graduated from Complutense University with a degree in Medicine and Surgery in 1974, and subsequently completed a PhD in Medicine and Surgery. He is a former Associate Professor of Orthopedics at the Autonomous University of Madrid. Dr. Rodríguez-Merchán is the author of more than 250 articles in peer-reviewed PubMed-cited journals, as well as ten books.