We report a prospective, stratified study of 60 PCA-cups and 60 RM-polyethylene cups which have been followed for a median time of 90 months, with annual radiography. The radiological migration of cups was measured by the computer-assisted EBRA method. A number of threshold migration rates from 1 mm in the first year to 1 mm in five years have been assessed and related to clinically determined revision rates. A total of 28 cups showed a total migration of 1 mm or more within the first two years; 13 of these cups have required revision and been exchanged. The survival curves of cups which had previously shown early migration were considerably different from those without early migration. For cups with a migration of less than 1 mm within the first two years the mean survival at 96 months was 0.96 +/- 0.02; for migrating cups, it was 0.63 +/- 0.11 (log-rank test, p=0.0001; chi-square value=39.4). Early migration is a good predictor for late loosening of hip sockets.
Xiaoyu Yan, Xu Steven Xu, Katja Weisel, María‐Victoria Mateos, Pieter Sonneveld, Meletios A Dimopoulos, Saad Z. Usmani, Nizar J. Bahlis, Thomas A. Puchalski, Jon Ukropec, Kevin M. Bellew, Ming Qi, Steven Sun, Honghui Zhou
Andrew Spencer, Philippe Moreau, María‐Victoria Mateos, Hartmut Goldschmidt, Kenshi Suzuki, Mark‐David Levin, Pieter Sonneveld, Robert Z. Orlowski, Sung‐Soo Yoon, Saad Z. Usmani, Katja Weisel, Donna Reece, Tahamtan Ahmadi, Huiling Pei, Wendy Garvin Mayo, Xue Gai, Jodi Carey, J. Blake Bartlett, Robin Carson, Meletios A Dimopoulos
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