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Biological effects of wear products (particles and metal ions) generated by metal-on-metal (MoM) hip replacements made of CoCrMo alloy remain a major cause of concern. Periprosthetic osteolysis, potential hypersensitivity response and pseudotumour formation are possible reactions that can lead to early revisions. To accurately analyse the biological response to wear particles from MoM implants, the...
Diamond-like carbon (DLC) films are used increasingly for coating of hip endoprostheses. The term DLC describes not a single material, but a class of materials, each material showing unique properties. Five commercially available DLC-coatings along with conventional thin films used for coating of implants (TiN and CrN) are tested on their wear behaviour by disc on pin test, as well as on their structural...
In the present study metal-on-metal (MoM) McKee-Farrar prostheses of the first generation were investigated by means of transmission electron microscopy (TEM). It was possible to observe the worn regions using a novel taper section preparation technique without producing any artefacts. Thereby, it could be shown that the wear in vivo leads to a reduction in grain size by a factor of up to 20,000....
Hydrogen represents an important alternative to fossil fuels. Hydrogen storage is possible as a gas, at room temperature (RT) at about 20MPa pressure, and in a liquefied form, at cryogenic temperatures of about 20K. The latter form is particularly attractive due to the possibility of stocking a large quantity of hydrogen within a small volume. In moving parts (e.g. of transport vehicles) cryogenic...
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