The second edition of the Atlas of Osteoporosis is designed to be useful to a broad readership united in their interest in the disorder. The expert authors have encapsulated not only the well-established basics of osteoporosis but also new developments in the field in a format that makes extensive use of graphical displays of important data. Issues that are well known to be important to skeletal biology and osteoporosis (eg, nutrition, exercise, and growth) have been updated.