The golden standard for bone evaluation is dual photon X-ray absorptiometry(DXA) of the lumbar spine and of the hip. More
recently, ultrasounds have been proposed as an alternative for bone measurements. The question is that of the complementarity of these
approaches: does ultrasound behaviour inform us on bone structure, independently of its known relation to bone mass. To try to answer
this question, we compare the results of DXA to those of ultrasound investigations in different clinical bone diseases,
characterized by a great diversity of bone structure modifications.