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The Journal of Bone and Joint Surgery 81:1501 (1999)
© 1999 The Journal of Bone and Joint Surgery, Inc.

Correspondence

Correspondence

B. M. Wroblewski, F.R.C.S., Daniel J. Berry, M.D., William S. Harmsen, M.S. and Duane M. Ilstrup, M.S.

TO THE EDITOR:

In the article "The Natural History of Debonding of the Femoral Component from the Cement and Its Effect on Long-Term Survival of Charnley Total Hip Replacements" (80-A: 715–721, May 1998), Berry et al. defined debonding as "the loss of the bond between the metal femoral component and the acrylic cement." This definition is presumably based on the assumption that a bond does, in fact, exist between the smooth femoral component and the cement. I suggest that any such arrangement is merely an interference fit and employs the common engineering principle of male and female tapers engaging under load. For the system to become load-bearing, a slip must occur, preferably between the taper of the stem and the cement, or cement fixation will fail.

Support of the distal end of the stem or engagement of the proximal part of the stem within or on . . . [Full Text of this Article]


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