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PubMed1977

[The implantation of lyophilized and gamma-sterilized allogenetic incus and of lyophilized and gamma-sterilized xenogenetic malleus (calf) in rabbits and humans (author's transl)].

The histological reactions to the implantation of allogenetic and xenogenetic lyophilized and gamma-sterilized material into the middle ear of rabbits and men is described. In contrary to the behaviour of allogenetic material the xenogenetic shows a clear minor tendency of revitalisation. The reason is the antigen-antibody-reaction which takes place at the capillary network of the donor and leads to a hylinosis with following obliteration of the vascular rete. Therefore the angiogenetic osteogenesis cannot develop. The clinical usuability of such material is discussed.

Animals↗
PubMed1977

[Investigations on protein metabolism in malleus and incus (author's transl)].

Protein and mucopolysaccharide metabolism was studied in the auditory ossicles of rabbits after administration of tritiated amino acids to three and of S35 to two animals. No differences between S35 and aminoacid turnover was seen, indicating a parallelmetabolism of proteins and mucopolysaccharides of the intercellular substance. The tissue, cartilage and bone, shows a metabolism on the molecular level. Areas of cartilage ground substance adjacent to the incudomalleolar joint and the interglobular spaces are not labelled by the radioactive substances. They are excluded from metabolical turnover, while the adjacent cells remain vital. This observation indicates a change of cellular properties, from cartilage to bone cell. The subperiostal bone has lower metabolism than the underlying skeinlike bone. Few osteones were found.

Animals↗
PubMed1993

Remodelling of the normal incus.

Thirty normal incudes were examined using scanning electron microscopy (SEM) to assess the pattern and degree of bony remodelling. The body and short process appeared stable throughout life. By contrast, the lenticular and long processes demonstrated marked osteoclastic activity with a tendency to undergo progressive erosion with advancing age.

Adolescent↗