EARLY MIGRATION PREDICTS LATE ASEPTIC FAILURE OF HIP SOCKETS

Author:

Krismer M.1,Stöckl B.1,Fischer M.1,Bauer R.1,Mayrhofer P.2,Ogon M.1

Affiliation:

1. University of Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria.

2. Department of Geometry, Institute of Mathematics and Geometry, University of Innsbruck, Technikerstrasse 13, A-6020 Innsbruck, Austria.

Abstract

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.

Publisher

British Editorial Society of Bone & Joint Surgery

Subject

Orthopedics and Sports Medicine,Surgery

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