Quantitative Ultrasound Measurements of the Tibia and Calcaneus in Comparison with DXA Measurements at Various Skeletal Sites |
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Authors: | A M Tromp J H Smit D J H Deeg P Lips |
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Institution: | (1) Institute for Research in Extramural Medicine (EMGO Institute), NL;(2) Department of Sociology and Social Gerontology, NL;(3) Department of Psychiatry, and, NL;(4) Department of Endocrinology, Vrije Universiteit, Amsterdam, The Netherlands, NL |
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Abstract: | The performance of quantitative ultrasound (QUS) measurements of the tibia and calcaneus was studied in 109 elderly people
(age range 65–87 years). Broadband ultrasound attenuation (BUA) and speed of sound (SOS) were measured at the calcaneus and
SOS was assessed at the tibia. Short-term precision of tibial QUS was studied in 16 volunteers. The coefficient of variation
(CV) was 0.4% and the standardized CV (sCV) was 4.4%. We compared the calcaneal and tibial QUS measurements with bone mineral
density (BMD) measurements of the lumbar spine, femoral neck, trochanter and total body assessed by dual-energy X-ray absorptiometry
(DXA). Calcaneal QUS correlated better with BMD at various skeletal sites than tibial QUS. Calcaneal BUA showed higher correlations
with BMD values of the lumbar spine, femoral neck, trochanter and total body than calcaneal and tibial SOS (r= 0.48–0.64, r= 0.30–0.47, r= 0.35–0.47, respectively; p<0.001). Body weight modified the relationships between calcaneal and tibial QUS and BMD measurements of the hip. Higher body
weight was associated with higher BMD values at the femoral neck and trochanter for the same calcaneal and tibial QUS values.
After adjustments for body weight correlations of tibial and calcaneal QUS with BMD improved and were very similar. This suggests
that correction for body weight is important and could add to the predictive value of QUS measurements.
Received: 16 July 1997 / Accepted: 8 July 1998 |
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Keywords: | :Anthropometry – Calcaneus – Dual-energy X-ray absorptiometry – Quantitative ultrasound – Tibia |
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