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Osteopenia, known as "low bone mass" or "low bone density", is a condition in which bone mineral density is low. [1] Because their bones are weaker, people with osteopenia may have a higher risk of fractures, and some people may go on to develop osteoporosis. [2] In 2010, 43 million older adults in the US had osteopenia. [3]
Archives of Osteoporosis is a peer-reviewed medical journal published by Springer Science+Business Media. [1] It was established in 2006 and is an official journal of the International Osteoporosis Foundation and the United States' National Osteoporosis Foundation . [ 1 ]
Stress shielding is the reduction in bone density as a result of removal of typical stress from the bone by an implant (for instance, the femoral component of a hip prosthesis). [1]
Senile osteoporosis has been recently recognized as a geriatric syndrome with a particular pathophysiology. There are different classification of osteoporosis: primary, in which bone loss is a result of aging and secondary, in which bone loss occurs from various clinical and lifestyle factors. [1]
The trabecular bone score is a measure of bone texture correlated with bone microarchitecture and a marker for the risk of osteoporosis. Introduced in 2008, [1] its main projected use is alongside measures of bone density in better predicting fracture risk in people with metabolic bone problems.
A normal T score is -1.0 and above, low bone density is between -1.0 and -2.5, and osteoporosis is -2.5 and lower. A Z score is just a comparison of what a patient's bone mineral density is in comparison to the average bone mineral density of a male or female of their age and weight.
Additionally, there is question of the overall efficacy of calcitonin-containing nasal sprays. A phase III trial found no difference between placebo and nasal calcitonin sprays on lumbar bone mineral density in osteoporosis. [34] It did find a significant increase in bone mineral density with oral calcitonin.
In the animal kingdom, there also exists a non-pathological form of osteosclerosis, resulting in unusually solid bone structure with little to no marrow. It is often seen in aquatic vertebrates, especially those living in shallow waters, [8] providing ballast as an adaptation for an aquatic lifestyle. It makes bones heavier, but also more fragile.