Osteoporosis is a reduction in the mass of bone per unit volume, which predisposes to the fracture of skeleton even with or without minimal trauma. So it causes a major significant problem of public health, especially in elderly. Unfortunately,
it
dose
not usually become evident on the plain radiography until one third of skeletal mass is lost.
But the development of variable methods of measuring bone mineral density(BMD) objectively has made it possible to be evaluated more accurately. Among them, the newly introduced Dual Photon Absorptiometry(DPA) allows us to measure BMD of axial
skeleton
nontraumatically with high accuracy and precision in clinical practice. The measurement of the spine and femur neck BMD by DPA appears to be diagnostic method of the osteoporosis as well as the estimation of fracture threshold and fracture rate
in
high
risk group. So, we analyze the datas form the 150 patients with osteoporosis, who taken DPA to evaluate the spine and femur neck BMD from Jan. 1991 to Oct. 1991 in this hospital The aim of this study is to estimate the fracture threshold and rate
in
osteoporosis group by comparing their BMD with that of age-matched normal control group.
@ES Following results were obtained:
@EN 1) In osteoporosis group, the change of BMD with aging shows pattern of linear regresson(11.7% and 13.7% decrease per ten years in lumbar spine and femur neck respectively.)
2) In osteoporosis group, especially in the group with fracture, the rate of decrement in BMD is accelerated above the age of 55, compared to the maximal BMD value of normal Korean adult.
3) It is suggested that 0.898g/㎠ and 0.689g/㎠ of BMD lumbar spine and femur neck respectively, are the fracture threshold for the osteoporosis group.
4) The fracture rate is 60% or more above the age of 65 years and 50% or more below the level, 0900g/㎠ and 0.700g/㎠ of BMD in lumbar spine and femur neck, respectively.
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