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The Journal of Bone and Joint Surgery 80:764-5 (1998)
© 1998 The Journal of Bone and Joint Surgery, Inc.

Correspondence

Correspondence

Richard M. Hall, Ph.D., Murali Jasty, M.D., Charles R. Bragdon, B.S., Kyla R. Lee, B.S., Amy E. Hanson, M.D., John R. Elder, William H. Harris, M.D. and Devon D. Goetz, M.D.

TO THE EDITOR:

I read with great interest "Wear of Polyethylene Acetabular Components in Total Hip Arthroplasty. An Analysis of One Hundred and Twenty-eight Components Retrieved at Autopsy or Revision Operations" (79-A: 349–358, March 1997), by Jasty et al. I offer two alternative explanations for observations recorded during the study—namely, the negative correlation between the rate of wear and the duration in situ and the rise in the rate of volumetric wear as the radius of the head increased.

Jasty et al. indicated that the negative association of the rate of debris production with the duration in situ is incompatible with the long-term increased rates of wear linked to the degradation of ultra-high molecular weight polyethylene. In fact, this observation can result entirely from the sampling involved in this type of retrieval study and, thus, such an inference cannot be drawn. The wear rates decrease as the duration in situ . . . [Full Text of this Article]


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