Donald Resnick, MD, Chief, Musculoskeletal Imaging, Professor of Radiology, University of California, San Diego, San Diego, CA, USA Heung Sik Kang, MD, Professor of Radiology, Seoul National University College of Medicine, Chief, Musculoskeletal Section, Department of Diagnostic Radiology, Seoul National University Hospital, Seoul, Korea Michael L. Pretterklieber, MD, Assistant Professor, Institute of Anatomy, University of Vienna, Vienna, Austria