Measurements taken at different sites or with different technologies are not well correlated. Hence the proportion of individuals classified as having osteoporosis (on a T score <-2.5) will vary considerably on the site and method of measurement
Because of these considerations it has been suggested that bone density measurement should be standardised to total hip bone mineral density measured by DEXA. This measurement id predictive both of cervical and trochanteric fractures and precision error at this site is low.
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