Initial stability of a new hybrid fixation hip stem: Experimental measurement of implant-bone micromotion under torsional load in comparison with cemented and cementless stems

Massimiliano Baleani, Luca Cristofolini, Aldo Toni

Research output: Contribution to journalArticle

Abstract

A new hybrid fixation stem, named cemented-locked uncemented (CLU), for total hip arthroplasty was developed to achieve good initial stability. Primary stability is guaranteed by the cement which is injected into two pockets in the lateral area. This leaves a large surface available for long- term biologic fixation (direct bone attachment on implant). This study evaluates in vitro the initial stability of the CLU prototype under torsional load, in comparison with cemented and cementless stems. The results show that the CLU stem is very stable in simulated stair climbing. Its micromotions are comparable to those of a cemented prosthesis, and significantly less (80-90% lower) than those for a cementless stem. These findings confirm the optimal initial stability expected from the CLU prototype. This new design, which employs hybrid fixation, should improve bone formation on the implant and reduce the risk of stem loosening. (C) 2000 John Wiley and Sons, Inc.

Original languageEnglish
Pages (from-to)605-615
Number of pages11
JournalJournal of Biomedical Materials Research
Volume50
Issue number4
DOIs
Publication statusPublished - 2000

Keywords

  • Femoral component fixation
  • Initial stability
  • Micromovement
  • Stem design
  • Total hip replacement

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

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