Published in:
01-06-2004 | Musculoskeletal
Bilateral variation in radial bone speed of sound
Authors:
H. Vrahoriti, J. Damilakis, G. Papadokostakis, A. Hadjipavlou, N. Gourtsoyiannis
Published in:
European Radiology
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Issue 6/2004
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Abstract
The aims of this study were to: (a) examine differences in speed of sound (SOS) between the right (SOSR) and left (SOSL) radius; (b) detect bone loss following proximal forearm fracture by SOS measurement at the radius; and (c) compare SOSL and bone mineral density (BMD) of one-third, mid-distal, ultra-distal and total region of the left radius. Two hundred eighty-seven Caucasian women (mean age 60.4±6.7 years) participated in this study. All subjects were right-handed. Twenty-seven women (mean age 63.6±8.0 years) had suffered a high-energy fracture of the right or left forearm. The SOS was assessed using a quantitative ultrasound device, whereas BMD was measured by dual energy X-ray absorptiometry (DXA). The SOSR was significantly higher than SOSL (4047.5±121.0 vs 4026.3±113.4 m/s; p<0.001). The contralateral absolute difference was 1.94% (95% confidence intervals: 1.73–2.15%). In women who had suffered a fracture of their right forearm, SOSR was not significantly higher than SOSL (3989.9±141.8 vs 3985.0±151.1 m/s), whereas the bilateral difference was reduced to 1.45%. In women with a previous fracture of the left forearm, SOSR was significantly higher than SOSL (4076.9±92.8 vs 3992.6±124.0 m/s; p<0.01) and the bilateral difference was increased to 2.61%. Of the 260 subjects without fracture, 155 had greater SOS in the right radius, 102 had greater SOS in the left radius and 3 patients had equal values of SOS in both bones. Calculated correlations between SOS and BMD were weak to moderate (r=0.27–0.41; p<0.0001 for all comparisons). The SOS measurements should be performed on both radial bones. A high-energy forearm fracture results in a decrease in SOS measured at the radius. Radial-bone SOS measurements cannot predict forearm BMD.