Background One-third radius (33% radius) bone mineral density (BMD) measurements of the non-dominant forearm using dual-energy X-ray absorptiometry (DXA) may be used for the diagnosis of osteoporosis in certain circumstances.
Objectives The aim of this study was to investigate the ability of radial speed of sound (SOS) measurements for identifying osteoporosis at the radius as measured by DXA.
Methods Both 1/3 radius BMD and SOS of the non-dominant forearm were measured in 128 women aged between 21 and 79 years using DXA (Hologic QDR® 4000) and a multi-site quantitative ultrasound (QUS) device (Sunlight Omnisense™ 8000), respectively. Osteoporosis at the radius was defined according to the WHO criteria (a T-score ≤-2.5) in postmenopausal women in the sample studied. In premenopausal women, Z-scores of ≤-2.0 were used for defining osteoporosis or BMD below the expected range for age.
Results Pearson correlation coefficients revealed statistically significant correlations between DXA 1/3 radius BMD and radial SOS measurements (r=0.496; p<0.001) as well as 1/3 radius and radial SOS T-scores (r=0.495; p<0.001). The areas under the receiver operating characteristic curves (AUCs) for radial SOS and its T-score for predicting osteoporosis or BMD below the expected range were 0.762 (p<0.001) and 0.760 (p<0.001), respectively.
Conclusions Significant correlations between radial BMD measurements and QUS parameters and fair AUCs for QUS parameters for identifying osteoporosis or BMD below the expected range found in this small sample of women may have implications that radial SOS measurements may provide valuable information for treatment decisions when DXA cannot be done in any region of interest.
Disclosure of Interest None Declared