Bone loss and age-related fractures.

The aging of the skeleton represents an important cause of both morbidity and mortality in the Western World. A great deal is known about the epidemiology, pathogenesis, and structural alterations which occur during the osteoporotic process to increase the risk of fracture with age. Whereas osteoporosis is associated with a decrease in bone mass, factors other than bone mass are clearly important. These include the turnover of bone and the destruction of trabecular elements, the repair of fatigue damage, as well as extraskeletal factors. An improved understanding of the aging of bones will form a basis for improved strategies for its prevention and treatment.