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Acetabular cup migration. Prediction of aseptic loosening.

Authors
  • Stocks, G W1
  • Freeman, M A
  • Evans, S J
  • 1 Royal London Hospital Medical College, England.
Type
Published Article
Journal
The Journal of bone and joint surgery. British volume
Publication Date
November 1995
Volume
77
Issue
6
Pages
853–861
Identifiers
PMID: 7593094
Source
Medline
License
Unknown

Abstract

We measured the proximal migration of 265 acetabular cups over seven years and correlated the findings with clinical outcome and acetabular revision for aseptic loosening. Cups which eventually became aseptically loose were shown to migrate more rapidly than successful cups. The average proximal migration at two years postoperatively for four groups of cups showed a monotonic relationship to the acetabular revision rate for aseptic loosening at 6.5 years. We conclude that acetabular cups which develop aseptic loosening as evidenced by pain, revision or screw fracture show increased proximal migration by one year, and that the 'migration rate' at two years can be used to predict the acetabular revision rate from aseptic loosening at 6.5 years.

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