Incus Autografts and Homografts in Rats

RECONSTRUCTION of the middle-ear chain is an important part of tympanoplastic procedures. As the use of alloplastic prostheses in chronic ear surgery does not always lead to the desired improvement in hearing, and the prosthesis is often extruded, many surgeons prefer bone or cartilage if possible. The fate of cortical bone grafts in middle ear and bulla of experimental animals has been studied extensively,¹,²and from these studies we know these grafts revitalize. Transposition of the incus between malleus and stapes in dogs³and between malleus and footplate in apes and cats,⁴has shown different degrees of remodeling in the incus. In humans this transposition of the incus has been advocated by Hall and Rytzner,⁵Guilford,⁶and House,⁷who obtained good functional results. Histologic examination in one of the reports⁵left doubt about the vitality of the transposed ossicle. Kley and Draf⁸