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Annealing
21%
682/3285
Gas plasma
3%
114/3285
Uncross-linking
8%
270/3285
Free radicals
66%
2165/3285
Remelting
1%
38/3285
Select Answer to see Preferred Response
As described in the review by Gordan et al. sterilization of polyethylene with irradiation causes free radical production which leads to cross-linking and increased wear resistance. Irradiation in inert gas reduces excessive oxidation. Remelting and annealing are heat treatments that reduce the excess free radicals formed by irradiation. McKellop et al. showed sterilizing an ultra-high molecular weight polyethylene acetabular cup without radiation (ethylene oxide or gas plasma) avoids immediate and long-term oxidative degradation of the implant but does not improve the inherent wear resistance of the polyethylene. Incorrect Answers: 1) Annealing is the process of heating the polyethylene close to its melting point to remove free radicals. 2) Gas plasma does not result from gamma irradiation. 3) Gamma irradiation does not result in reversal of cross-linking. 5) Remelting involves going past the melting point to remove free radicals. These sterilization processing techniques significantly affect polyethylene performance and wear characteristics.
3.5
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