Osteoporosis

Osteoporosis: Screen & Prevent Health Video

Osteoporosis

Osteoporosis, which is characterized by a decrease in the mass of otherwise normal bone is the most common metabolic bone disease. Normal bone is made of a hard outer shell (the cortex) and an inner network of spicules (fibers), called trabeculae, that give bone its characteristic strength. Bone mass is maintained at a progressive and then constant level until around the age of thirty-five. This maintenance is accomplished through bone remodeling, a cycle of breaking down and building up of bone. This cycle is controlled by osteoblast cells, which make bone, and osteoclast cells, which destroy bone. Beginning around age forty, the rate at which bone breaks down can exceed that at which it is built, resulting in diminished mass and a diminished amount of calcium in the bone. For women, in addition to this normal age-related bone loss, menopause and its subsequent reduction in female hormone levels (specifically estrogen) cause a specific loss in cortical and trabecular bone. In those who develop osteoporosis, the reduction in cortical and trabecular bone can be up to 30-40 percent, resulting in fragile bones that are prone to fracture.

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