BROAD-BAND ULTRASOUND ATTENUATION AT THE CALCANEUS MEASURED USING A NEW CONTACT ULTRASOUND UNIT

We evaluated a new contact ultrasound device, developed and manufactur ed in France, for measuring broadband ultrasound attenuation at the ca lcaneus. We first studied the influence on measurement results of a nu mber of parameters including the nature of the coupling agent, heel po sition, transducer temperature, and foot vasodilation. We then determi ned the reproducibility of the measurements (2.14+/-1.07% in the mediu m-term) and established reference values in women (n=612) and men (n=1 06). Broadband ultrasound attenuation decreased between 25 and 85 year s of age by 34% in women and 17% in men. Sensitivity and specificity f or detection of decreased bone mass at the calcaneus were 85.5% and 81 .5%, respectively. Sensitivity and specificity of the measurement at t he calcaneus as compared to the lumbar spine were 90.7% and 89.1%, res pectively. This unit intended for screening purposes is very easy to u se, and the measurements it provides are immediately available. It can be expected to help determine the optimal strategy for use of ultraso und in the management of osteoporosis.