Michael Leunig is professor at ETH Zürich,head of orthopedics and chief medical officer at the Schulthess Clinic in Zurich, Switzerland's largest orthopedic center. His practice covers the entire spectrum of hip surgery from joint preservation to joint replacement, including revision surgery. His current research activity focuses on the hip. He has more than 279 Pubmed listed references. His H-factor as of July 2022 is 66 (Web of Science) and he has edited several books and authored several chapters. He has been an invited speaker at all the major orthopedic conferences and is the recipient of several awards recognizing his achievements, including funding for his research. In addition to being a reviewer for all the major orthopaedic journals, he has been International Associated Editor of CORR, Associate Editor of OJSM, and Associate Editor of JHPS.Ira Zaltz is a Clinical Professor at the University of Michigan (Ann Arbor, MI, USA) and the head of pediatric orthopaedic surgery at William Beaumont Hospital. His practice spans the development of the hip, from birth until early adulthood, focusing on developmental and acquired disorders. He has published more than 70 peer reviewed articles and numerous book chapters. He is a regular participant at national and international meetings, and serves as a reviewer multiple publication. His research interest involves developmental biology of the hip joint, physeal remodelling, and dynamic hip imaging.Reinhold Ganz started most of his research with cadaver studies of the vascular supply beyond classic knowledge and was focusing on surgical utility of the findings. A first project was to optimize acetabular reorientation. Execution of the osteotomy steps from the inside of the pelvis allowed to spare the supplying blood vessels and the abductor musculature. The technique combines large correction with sufficient fragment perfusion, even after extensive capsulotomy for additional intra-articular surgery. The Bernese Periacetabular Osteotomy (PAO) has gained worldwide acceptance.Vascular studies showed also a way to perform a safe dislocation of the femoral head without the risk of avascular necrosis. Routine surgical dislocation allowed to formulate the mechanism of impingement as initiator of osteoarthritis of the hip, hitherto viewed as primary. When combined with an extended retinacular flap, it opens the door for a new class of intraarticular procedures, notably relative neck lengthening, sub-capital realignment, true femoral neck osteotomy and osteotomy of the head to reduce its size. Dr. Ganz received several honors, among others the King Faisal International Price for Medicine, the Arthur Steindler Award, the Lifetime Achievement Award of the American Hip Society and the Meyer Award for “disruptive contributions to hip surgery”.Hannes A Rüdiger is professor at the University of Zurich and deputy head of the hip division at Schulthess Clinic in Zurich. While his clinical practice covers the entire spectrum of hip surgery his main focus is in primary and complex revision arthroplasty. Prior to his appointment at the Schulthess Clinic he was head of the hip and tumor serviced at the University of Lausanne, Switzerland. He is internationally trained in Switzerland, the US, Italy and Australia, and has completed fellowships in orthopaedic tumor surgery and joint arthroplasty. His research is focused on various aspects of hip arthroplasty.
