The prostheses available for reconstruction of the ossicular chain hav
e expanded to include a variety of synthetic materials. Hydroxyapatite
contains the inorganic constituents found in human living bone and is
currently being incorporated into many new prostheses. This study dem
onstrates the computed tomography and magnetic resonance image charact
eristics of eight middle ear prostheses, a block of dense hydroxyapati
te, and a human incus. Imaging of ossicular prostheses is more informa
tive with computed tomography.