Abstract
Quantitative ultrasound of bone is a promising method for bone assessment: radiation-free, portable and predictive of hip fracture. Its portability allowed us to study the relationships between ultrasonic parameters of bone with age and with non-vertebral fractures in elderly women living in 19 nursing homes. Broadband ultrasound attenuation (BUA) and speed of sound (SOS) of the calcaneus were measured (and the stiffness index calculated) in a sample of 270 institutionalized women, aged 85±7 years, using an Achilles bone densitometer (Lunar). The effects of age, history of non-vertebral and non-traumatic fractures, body mass index, triceps skinfold and arm circumference were assessed on BUA, SOS and stiffness index. Furthermore, to evaluate longitudinally the influence of aging on the ultrasound parameters of bone, 60 subjects from the same group had a second ultrasound measurement after 1 year. The cross-sectional analysis of the data on all 270 women showed a significant decrease (p<0.001) with age in BUA, SOS and stiffness index (−0.47%, −0.06%, and −1.01% respectively per year). In the 94 women (35%) with a history of previous non-vertebral fractures, ultrasound parameters were significantly lower (p<0.0001) than in the 176 women with no history of fracture (−8.3% for BUA, −1.3% for SOS, −18.9% for stiffness index). In contrast, there was no significant difference in anthropometric measurements between the groups with and without previous non-vertebral fractures, although the measurements decreased significantly with age. In the longitudinal study, repeated quantitative ultrasound after 11.4±0.8 months showed no significant decrease in BUA (−1%) but a significant decrease in SOS (−0.3%,p<0.0001) and in stiffness index (−3.6%,p<0.0002). In conclusion, quantitative ultrasound of the calcaneus measures properties of bone which continue to decline in institutionalized elderly women, and is able to discriminate women with previous non-vertebral fractures.
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Krieg, M.A., Thiébaud, D. & Burckhardt, P. Quantitative ultrasound of bone in institutionalized elderly women: A cross-sectional and longitudinal study. Osteoporosis Int 6, 189–195 (1996). https://doi.org/10.1007/BF01622734
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DOI: https://doi.org/10.1007/BF01622734