BIOL 2020 Chapter Notes - Chapter 3.1: Bone Density, Standard Score, Hip Fracture
7 May 2020
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Document Summary
Growth is important but quality of bone can be affected by exercising properly. You chew away 1% of bone every year and you put almost 1% back. So, you are in a subtle negative equilibrium. You can see the cortical and trabecular bone. In severe osteoporosis, bone is thin (that is why older people are hunched). Men get osteoporosis at half the rate women do, so it is seen as a men"s disease. The bone is measured at the wrist, at the spine, and at the hip. If your mother goes for bone-density test, she will get two-three density results. But, the density of bone at the wrist, spine, and a hip each location has a different value (g/cm3). The way you measure calcium within bone is two-dimensional. X-ray going through body knows how much mineral it is going through in cm3 area. A 0 z- score is 50% percentile and -2z score is 25%.
