Temperature influence on DXA measurements: bone mineral density acquisition in frozen and thawed human femora.

Abstract:

BACKGROUND:Determining bone mineral density (BMD) with dual-energy x-ray absorptiometry (DXA) is an established and widely used method that is also applied prior to biomechanical testing. However, DXA is affected by a number of factors. In order to delay decompositional processes, human specimens for biomechanical studies are usually stored at about -20 degrees C; similarly, bone mineral density measurements are usually performed in the frozen state. The aim of our study was to investigate the influence of bone temperature on the measured bone mineral density. METHODS:Using DXA, bone mineral density measurements were taken in 19 fresh-frozen human femora, in the frozen and the thawed state. Water was used to mimic the missing soft tissue around the specimens. Measurements were taken with the specimens in standardized internal rotation. Total-BMD and single-BMD values of different regions of interest were used for evaluation. RESULTS:Fourteen of the 19 specimens showed a decrease in BMD after thawing. The measured total-BMD of the frozen specimens was significantly (1.4%) higher than the measured BMD of the thawed specimens. CONCLUSION:Based on our findings we recommend that the measurement of bone density, for example prior to biomechanical testing, should be standardized to thawed or frozen specimens. Temperature should not be changed during measurements. When using score systems for data interpretation (e.g. T- or Z-score), BMD measurements should be performed only on thawed specimens.

authors

Wähnert D,Hoffmeier KL,Lehmann G,Fröber R,Hofmann GO,Mückley T

doi

10.1186/1471-2474-10-25

subject

Has Abstract

pub_date

2009-02-24 00:00:00

pages

25

issn

1471-2474

pii

1471-2474-10-25

journal_volume

10

pub_type

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