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The Journal of Bone and Joint Surgery 80:1553-4 (1998)
© 1998 The Journal of Bone and Joint Surgery, Inc.

Correspondence

Correspondence

David H. Sochart, M.B., Ch.B., F.R.C.S.(Ed), F.R.C.S.(Orth), Seneki Kobayashi, M.D., Ph.D., Kunio Takaoka, M.D., Ph.D., Naoto Saito, M.D., Ph.D. and Kenji Hisa, M.D.

TO THE EDITOR:

In the article "Factors Affecting Aseptic Failure of Fixation after Primary Charnley Total Hip Arthroplasty. Multivariate Survival Analysis" (79-A: 1618–1627, Nov. 1997), Kobayashi et al. stated that the most important factor affecting loosening of the acetabular component is rapid wear of the polyethylene. This is consistent with the findings of previous investigators who have reached the same conclusion3,4, but it must be remembered that penetration of the metallic femoral head into the polyethylene, as seen on radiographs, represents the combined effect of two underlying processes. The first process is creep of the polyethylene, which is initially rapid and is said to reach equilibrium at 1.5 years, and the second is the steady and much slower process of wear2. The total amount of polyethylene wear measured directly on a radiograph therefore consists of contributions from both the wear process and the creep process, . . . [Full Text of this Article]


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