By D. G. Poitout (auth.), Dominique G. Poitout MD (eds.)
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Extra resources for Biomechanics and Biomaterials in Orthopedics
Combinations of prosthetic materials and biological materials are now used more and more frequently, whether it is a bone graft sheathing a prosthesis, or artificial skin made of human cells and cultured, or even live pancreatic cells developing within a synthetic structure. In truth, it is worrying to think how far it could go, and whether one day it would be possible to create a wholly artificial man or carry Biomechanics and Biomaterials in Orthopedics out a succession of grafts aiming to replace the various components of the human body.
Therefore, in spite of the fact that the aluminaon-alumina hip prostheses used in the 1970s did not show significantly better 10-15 year results as compared to those of the Charnley hip prostheses, the current alumina-on-alumina hip prostheses are expected to bring about much better long-term results than those used in the 1970s. On the other hand, it is a well-known rule for hip prostheses that the smaller the head size the less the volumetric wear of the bearing surface. There has been much work on ceramic-onpolyethylene hip prostheses in attempts to reduce the volumetric wear of polyethylene.
They have excellent biocompatibility, a high breaking load, and an elastic limit close to that of the breaking load, which eliminates any problems of permanent deformation in the case of high stresses, but also limits their use as a material in osteosynthesis. Owing to the passivation phenomenon, titanium covers itself spontaneously with a protective film of titanium oxide which renders it remarkably resistant to corrosion. This can be increased even further by the chemical process of anodization.
Biomechanics and Biomaterials in Orthopedics by D. G. Poitout (auth.), Dominique G. Poitout MD (eds.)