Wolf R. Drescher, MD, PhD, is Head of the Joint Replacement Center and the Department of Orthopaedic Surgery of the Lower Limb and Arthroplasty, Rummelsberg Hospital, Schwarzenbruck, Germany. After graduating from Medical School at the University of Düsseldorf in 1997, he gained his PhD from Aarhus University, Denmark and completed his board certification as a specialist in orthopaedics in Kiel in 2005. He was appointed as an Associate Professor by RWTH University, Aachen, in 2011. Dr. Drescher is Past-President of ARCO (Association Research Circulation Osseous) and Chairman of VLOU Bavaria (VLOU is the German association for leading orthopaedic and trauma surgeons). His clinical focuses are hip and knee arthroplasty, joint-preserving surgery of the lower limb, and avascular necrosis of the hip, while his research fields include pathogenesis and treatment of osteonecrosis, minimally invasive arthroplasty, short stems, and fast track surgery. He is an editorial board member for Hip and Pelvis (journal of the Korean Hip Society). Kyung-Hoi (Kay) Koo, MD, PhD, is Director of the Joint Disease and Arthroplasty Center, Seoul National University Bundang Hospital, Seongnam, South Korea and a Professor in the Department of Orthopaedic Surgery at Seoul National University College of Medicine. Dr. Koo graduated from Seoul National University College of Medicine in 1982 and then specialized in skeletal radiology and orthopaedic surgery. He is a Former President of ARCO (Association Research Circulation Osseous), current President of the Korean Hip Society, and an international member of the American Academy of Hip and Knee Surgeons (AAHKS). His special areas of interest include the pathophysiology of osteonecrosis, joint-preserving operations, and hip replacement arthroplasty. Dr. Koo is an editorial board member for The Bone & Joint Journal, the Journal of Korean Medical Science, and the Journal of Hip Surgery. He has authored 214 articles in peer-reviewed journals and is co-editor of the previous Springer book Osteonecrosis (2014).Russell E. Windsor, MD is an Attending Orthopaedic Surgeon at the Hospital for Special Surgery in New York City and is also a Professor of Clinical Surgery (Orthopaedics) at Weill-Cornell Medicine. Dr. Windsor graduated from Georgetown University Medical School in 1978 and completed Orthopaedic Surgery residency at the University of Pennsylvania Medical Center in 1983. He was awarded a Fellowship in Knee Reconstructive surgery under the mentorship of John Insall MD at the Hospital for Special Surgery graduating in 1984. He has been on the staff at Hospital for Special Surgery since 1985. He was president of the American Knee Society in 2005. Besides the American Knee Society, he is also a member of the European Knee Society (EKS), American Association of Hip and Knee Surgeons (AAHKS) and International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine (ISAKOS). He has authored over 100 articles, and has lectured worldwide on hip and knee replacement techniques
