Dr. Robert Marx is an orthopaedic surgeon at the Hospital for Special Surgery in New York City and Professor of Orthopedic Surgery at the Weill Medical College of Cornell University. Regarded among the world's top orthopaedic surgeons, Dr. Marx has treated thousands of knee and shoulder injuries, and is well known for his expertise in ACL and complex multi-ligament knee reconstructive surgery. A former member of the Editorial Advisory Board for Muscle and Fitness magazine, Dr. Marx has written a book on bone tumours and has published more than 100 peer-reviewed articles in leading orthopaedic and research journals, including the prestigious New England Journal of Medicine. He was awarded with the 2003 O'Donoghue Sport Injury Research Award by the American Orthopedic Society for Sports Medicine for his study on determinants of knee injury following anterior cruciate ligament (ACL) tears. Dr. Marx has appeared on national television and lectured extensively worldwide on knee and shoulder surgery, including the description of new surgical techniques he has developed. As a visiting professor of orthopaedic surgery, he has been invited to speak at many academic institutions, including Harvard University and The Mayo Clinic. He also has his own personal website (www.DrRMarx.com), and is a regular contributor to the Hospital for Special Surgery's website (www.hss.edu). Dr. Grethe Myklebust practices at the Norwegian Olympic Sports Centre as a specialist in Sports Physiotherapy in Oslo, Norway. She is an associate professor at the Oslo Sports Trauma Research Centre at the Norwegian School of Sports Sciences. Dr. Myklebust enjoys cross-country skiing, running, and hiking.