Justification: The edits to this standard reflect the consensus of the task group, which convened in May 2011 in Anaheim, CA. Rationale: Lipid absorption into UHMWPE during in vivo use complicates the evaluation of the extent of oxidation since the lipid absorption peak and the carbonyl absorption peak may overlap. Thus, in order to evaluate the oxidative state of retrieved implants, the lipids should be extracted from the polymer. By submerging the films in a boiling reagent (heptane or hexane) for 6 hours, the lipids can be effectively extracted and allow for evaluation of the extent of oxidation. FTIR spectra showing the carbonyl absorption bands. Note that both reagents effectively extracted the lipids (the lipid absorption peak is centered at approximately 1740 cm-1).
FTIR; implant; oxidation; oxidation index; UHMWPE;
Citing ASTM Standards
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