Osteoporosis  is a disease of bones that leads to an increased risk of fracture.  In osteoporosis, the bone mineral density (BMD) is reduced, bone microarchitecture deteriorates, and the amount and variety of proteins in bone is altered.  Osteoporosis is defined by the World Health Organization (WHO) as a bone mineral density that is 2.5 standard deviations or more below the mean peak bone mass (average of young, healthy adults) as measured by DXA. (adapted from wikipedia)

Image by Dr. Michael Klein, University of Alabama. Osteoporosis in Vertebrae showing 3 healing microfractures. The photograph is magnified 15x and uses a polarized objective.  This photo won an honorable mention in Olympus BioScapes 2004 contest (link)


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