Periprosthetic bone mineral density changes with femoral components of differing design philosophy
- PMID: 11409459
- PMCID: PMC3620635
- DOI: 10.1007/s002640100246
Periprosthetic bone mineral density changes with femoral components of differing design philosophy
Abstract
We measured the bone mineral density in 22 patients with the cylindrical stemmed cobalt-chrome AML prosthesis (collared) and in 22 patients with the tapered stem titanium CLS prosthesis (collarless). DEXA scanning was undertaken at a mean of 40 months in the AML and 52 months in the CLS group from the time of implant insertion. In both groups the greatest mean loss of BMD was found in Gruen zone 7 and the least change in Gruen zone 5. In all zones the BMD loss was greater in the AML group but only statistically significant in zones 6 (P<0.05) and 7 (P<0.01). Although numerous factors affect BMD changes around cementless implants, this study suggests that less bone loss can be associated with the titanium CLS stem.
Nous avons mesuré la densité minérale de l'os chez 22 patients porteur d'une prothèse AML en cobalt-chrome à tige cylindrique (avec colerette) et chez 22 malades avec une prothèse CLS en titane avec une tige conique et sans colerette. Une scanographie DEXA a été entreprise en moyenne 40 mois après implantation des prothèses AML et 52 mois après prothèse CLS. Dans les deux groupes la plus grande perte moyenne de DMO a été trouvée dans la zone 7 de Gruen et le plus petit changement dans la zone 5 de Gruen. Dans tous les zone la perte de densité osseuse était plus grande dans le groupe AML mais statistiquement uniquement dans les zones 6 (P<0.05) et 7 (P<0.01). Bien que de nombreux facteurs affectent les changements de DMO autour des implants sans ciment, cette étude suggère qu'il y a moins de perte osseuse avec la tige CLS en titane.
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