Effects of radiation-sterilization on medical implants


The free radical concentrations in irradiated and aged ultra-high molecular weight polyethylene (UHMWPE) joint components were studied using electron spin resonance spectrometer. Results show that a significant concentration of free radicals exists in UHMWPE materials for at least three years after exposure to radiation. Peroxy radicals are predominant in surface samples which are highly accessible to oxygen while more primary radicals remains in the core that is well isolated from oxygen.

Publication Title

Radiation Physics and Chemistry