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Evaluation of calcaneus bone densitometry against hip and spine for diagnosis of osteoporosis

¹ Regional Medical Physics Department and³ Rheumatology Department, Sunderland Royal Hospital, Sunderland and ² University of Sunderland, Sunderland, UK

View larger version (15K): [in a new window]   Figure 1. Bland–Altman plot of the differences between bone mineral density measurements at each heel, against their mean. The solid regression line (y=0.015 x -0.015) has no significant slope (95% confidence limits 0.1, -0.07) and is close to the line of zero difference (broken line), indicating that there is no systematic difference between measurements, whatever the bone mineral density (BMD) value. , female; •, male.

View larger version (11K): [in a new window]   Figure 2. The relationships between (a) left heel and total hip T-scores, (regression line y=0.18+0.73x, r=0.75), and (b) left heel and the minimum axial T-scores (regression line y=0.73+0.62x, r=0.66). , female; •, male.

View larger version (15K): [in a new window]   Figure 3. Receiver operating characteristic curves for the T-scores for each heel, comparing their performance for diagnosis of osteoporosis at the hip. The points plotted (•, left heel; , right heel) are categorized operating points from the original continuous data. The areas under the fitted curves for each heel (left 0.89, right 0.88) were not significantly different (p=0.6).