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Ultrasound microscopy is a promising tool to investigate material properties of various tissues. The application to bone is not straightforward and requires a thorough inspection of currently accepted models. Their refinements will be incorporated into a computer program for an objective interpretation of the measured data, based on the numerical solution of inverse problems. Resume. La microscopie ultra-son est un outil prometteur pour l'exploration des proprietes de materiel de tissus varies. L'application au tissu osseux n'est pourtant pas facilrealiser et exige une inspection scrupuleuse des modeles acceptespresent. Leurs ameliorations seront incorporees dans un programme d'ordinateur pour une interpretation objective des dates mesures, fonde sur les solutions numeriques de problemes inverses.