We dedicate this text to Drs. Ernest E. Aegerter, a pathologist, and John A. Kirkpatrick Jr., a radiologist. They were among the principal founders of the ?eld of skeletal pathology and radiology. During their time, their residents and colleagues knew them as great educators with a dedication and a passion for their work. Their textbook, Orthopedic Diseases, published initially in 1958 was among the ?rst interdisciplinary works devoted to this ?eld. Dr. Aegerter and Dr. Kirkpatrick illuminated many aspects of the ?eld of radiology. Today, with the advent of new technologies, this ?eld has...