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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]
In response to the increased bone resorption, there is increased bone formation and a high-turnover state develops which leads to bone loss and perforation of the trabecular plates. [20] As osteoclasts break down bone, patients see a loss of bone mineral density (BMD). Low BMD renders bones more brittle and hence susceptible to fracture.
When on treatment with bisphosphonates rechecking bone mineral density is not needed. [171] There is tentative evidence of benefit in males with osteoporosis. [175] Fluoride supplementation does not appear to be effective in postmenopausal osteoporosis, as even though it increases bone density, it does not decrease the risk of fractures. [176 ...
Bone mineral density (BMD) is a measure commonly used to quantify bone health. A lower BMD value indicates an increased risk of an osteoporosis or a fracture. [13] There is a large range of factors influencing BMD. Protein consumption has shown to be beneficial for bone density by providing amino acid substrates necessary for bone matrix formation.
On Mars, where gravity is about one-third that of earth, the gravitational forces acting on astronauts' bodies would be much lower, causing bones to decrease in mass and density. [ 6 ] Average bone loss of 1–2% was recorded in astronauts on Mir each month. [ 2 ]
While senile osteoporosis (type II) is mainly attributed to age, other risks include medical, pharmacological, genetic, and environmental factors. Peak bone mass is a major determinant of bone density, which starts in utero and is typically complete by the age 40. [5]
The rapid change in bone density is dramatic, making bones frail and resulting in symptoms that resemble those of osteoporosis. On Earth, the bones are constantly being shed and regenerated through a well-balanced system which involves signaling of osteoblasts and osteoclasts. [70]
Bone densities are often given to patients as a T score or a Z score. A T score tells the patient what their bone mineral density is in comparison to a young adult of the same gender with peak bone mineral density. 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.