Abstract
Ultrasound measurements of the calcaneus are related to incidence of osteoporotic fracture. Such measurements are generally made at fixed coordinates relative to a footplate. This study compares measurements at an anatomically located region of interest (ROIanat) and at fixed coordinates (ROIfixed), with bone mineral density measurements, in 84 postmenopausal women. Bone mineral density (BMD) was assessed using dual energy X-ray absorptiometry at both ROIs as well as at lumbar spine and femoral neck. Broadband ultrasound attenuation and velocity of sound were measured using a CUBA system at ROIanat and ROIfixed. Additionally, broadband ultrasound attenuation at ROIfixed was measured using a Walker Sonix instrument. Mean bone mineral density, broadband ultrasound attenuation and velocity of sound did not differ significantly between ROIfixed and ROIanat, although broadband ultrasound attenuation by Walker Sonix (81.4±14.6 dBMHz-1) was significantly (P<0.001) greater than that by CUBA (63.7±14.2 dBMHz-1). The relationship between broadband ultrasound attenuation and BMD differed significantly between the 2 ROIs and the correlation of this relationship was significantly greater at ROIfixed than at ROIanat (r=0.74 versus 0.46, P<0.01). The differing relationship may reflect structural variation at different regions. ROI selection may thus be a possible confounding factor in ultrasound measurement.
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Brooke-Wavell, K., Jones, P.R.M. & Pye, D.W. Ultrasound and dual X-ray absorptiometry measurement of the calcaneus: Influence of region of interest location. Calcif Tissue Int 57, 20–24 (1995). https://doi.org/10.1007/BF00298991
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DOI: https://doi.org/10.1007/BF00298991