Abstract
This chapter summarizes the common test techniques used in the orthopedic community today for analyzing ultra-high molecular weight polyethylene (UHMWPE) during the various stages of processing. The techniques described can also be used to characterize explanted (retrieved) components in an effort to better understand the reasons for revision. The tests can be applied to UHMWPE powder, consolidated stock, or irradiated stock. There is a large battery of tests available to the researcher to examine the effects of radiation on the properties of UHMWPE. These effects include evolution of morphological structure, production of chemical species, and changes in mechanical properties. Caution must be used in sample preparation, test conditions, and data interpretation. This list of analytical tests is not all encompassing. Some regulatory agencies may require additional tests, depending on the nature of the material and the final application. Additionally, researchers may want to perform other tests to explore additional benefits of their material. This chapter examines the physical properties of UHMWPE that include its morphology, which encompasses both microscopic and macroscopic analysis of the material, as well as thermal properties and molecular weight.
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