Comparison of migration in modular sockets with ceramic and polyethylene inlays

This study compared migration in 73 cementless total hip arthroplasties (TH As) with either alumina ceramic (n=23) or polyethylene (n=50) inlays; prost hesis sockets and stems were identical except for the inlays. After 7 years of follow-up, 5 sockets (4 with ceramic and 1 with polyethylene inlays) ha d been revised an average of 63.3 months (range: 49-81 months) after implan tation, and survival analysis showed a significantly higher revision rate f or sockets with ceramic inlays (89+/-6%) versus polyethylene inlays (98.2+/ -1.7%) (P=.032). Migration analysis of the first three postoperative years revealed significantly higher vertical migration in sockets with ceramic in lays (P=.047), in patients aged <60 years (P=.02), and in osteoporotic type C bone (A versus C, P=.0071 and B versus C, P=.0004).