POLYETHYLENE WEAR IN THE CHARNLEY OFFSET BORE ACETABULAR CUP

We studied wear in the ultra-high-molecular-weight polyethylene offset bore socket in 54 hips which had had Charnley low-friction arthroplas ty. At an average follow-up of 8.1 years, the mean penetration rate wa s 0.04 mm per year, Correlation between the depth of socket penetratio n and the incidence of socket migration was confirmed, but socket migr ation occurred with lower penetration than had been previously reporte d.