[Scanning electron microscopy studies of morphologic changes in chemically stabilized ultrahigh molecular weight polyethylene]

Scanning electron microscopy (SEM) studies were performed on chemically stabilised ultra-high molecular weight polyethylene (UHMWPE) samples. The samples were sterilised by gamma radiation under a nitrogen atmosphere, packed under the exclusion of oxygen, and subjected to a special stabilising process. We investigated the surface as well as deeper surfaces in the samples using SEM: The samples showed minor surface irregularities resulting from the working of the material. Microtome sections of the specimens revealed no signs of cavitation. At high resolution, some typical lamination effects were to be seen. We were also able to demonstrate spherulites having diameters ranging from 10 to 40 microns.

In contrast to other samples, the UHMWPE evaluated did not show any kind of cavitation or cracks, and this might be an indicator for a positive development.