Densitometry measurements of allograft ear ossicles implanted in humans middles ears for more than 10 years have been performed by means of High Resolution Computerized Tomography and compared with similar measurements made in the opposite normal middle ear ossicles. Eight patients operated for unilateral chronic ear disease were selected for this study. Densitometry findings have been also correlated with histological observations made in allograft ossicles removed after a long-term implantation period.