Wear of high-dose gamma-irradiated polyethylene in total hip replacements

Between 1971 and 1978, 62 patients underwent total hip replacements (THRs) with high-dose (100 Mrad) gamma-irradiated polyethylene sockets. After a mean follow-up of 17. 3 years (range, 6-23 years), 28 hips in 26 patients were available for radiographic wear measurement. Twenty-three THRs with non-irradiated sockets were used as controls, although all these hips had loosened within 13 years. The rate of linear wear in irradiated sockets was significantly lower throughout the follow-up period (less than 2 years, 0.16 and 0. 38 mm/year; 2-6 years, 0.05 and 0.29 mm/year; more than 6 years, 0. 05 and 0.28 mm/year, respectively; mean, P < 0.0001). This result has demonstrated that high-dose gamma-irradiated, cross-linked polyethylene is a promising articulating material for THRs.