Femoral stem fixation. An engineering interpretation of the long-term outcome of Charnley and Exeter stems.
The excellent long-term results for the first-generation Charnley stem may not apply to later versions with flanges. It seems possible that the early design functioned as a taper-slip system, as accepted in the Exeter prosthesis. Comparison with the requirements for the alternative composite-beam system for the femoral component shows considerable differences that have important implications. These include design, surface finish, cementing technique and the interpretation of radiological signs of loosening. A distinction should be made between the requirements for the successful use of the two different engineering systems.
Shen
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Howmedica Inc., West Covina, California 91792, USA.
D002484:Cementation; D006622:Hip Prosthesis; D006801:Humans; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016896:Treatment Outcome