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Clinical and radiographic results and wear performance in different generations of a cementless porous-coated acetabular cup

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Abstract

We compared clinical results and wear performance in two different generations of a cementless porous-coated cup, analysing the long-term results of 83 uncemented Harris-Galante I cups (32-mm femoral head) and 93 uncemented Harris-Galante II cups (28-mm femoral head). All polyethylene liners were gamma irradiated in air. Polyethylene linear wear was estimated using a software package. The minimum follow-up was 10 years. Nine Harris-Galante I cups and two Harris-Galante II cups were revised due to aseptic loosening or polyethylene problems. The mean femoral head penetration at 6 weeks after surgery was 0.15 ± 0.05 mm for the Harris-Galante I cups and 0.12 ± 0.03 for the Harris-Galante II cups (p < 0.001);but mean wear was 0.13 ± 0.23 mm per year for the Harris-Galante I cups and 0.11 ± 0.10 for the Harris-Galante II cups (p = 0.740). Most of the metallic shells in both groups showed stable fixation. The so-called second-generation cups had lower initial polyethylene wear that resulted in less polyethylene wear at the latest the follow-up, but the overall wear rate was similar in both groups despite the different femoral head sizes and the improved locking mechanism.

Résumé

Nous avons analysé les résultats cliniques et l’usure portant sur deux types de cupules sans ciment différentes. 83 patients ont bénéficié d’une cupule sans ciment type Harris-Galante I (diamètre de la tête 32 mm) et, 93 patients d’une cupule sans ciment type Harris-Galante II (diamètre de la tête 28 mm). Tous les inserts en polyéthylène ont été irradiés aux rayons gamma en atmosphère d’air. L’usure du polyéthylène a été analysée par un logiciel informatique. Le suivi moyen a été de 10 ans. 9 cupules de type Harris-Galante I et 2 cupules de type Harris-Galante II ont été révisées pour un descellement aseptique ou pour des problèmes au niveau du polyéthylène. La pénétration moyenne de la tête fémorale, six semaines après l’intervention a été de 0,15±0,05 mm pour la Harris-Galante I et de 0,12±0,03 mm pour la Harris-Galante II (p < 0,001). L’usure moyenne a été de 0,13 ± 0,23 mm par an pour la cupule Harris-Galante I et de 0,11 ± 0,10 pour la cupule Harris-Galante II (p = 0,740). La plupart des inserts mécaniques n’ont pas présenté de défauts de stabilité. Ces cupules de deuxième génération ont une usure initiale du polyéthylène inférieure à celle de première génération par contre, l’usure moyenne est identique dans les deux groupes au plus long suivi quel que soit le diamètre de la tête fémorale et l’amélioration du mécanisme de fixation de l’insert PE.

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Authors and Affiliations

  1. Department of Orthopaedics, Hospital La Paz, Madrid, Spain

    E. García-Rey & E. García-Cimbrelo

  2. Calle Costa Brava 5, Portal 1, 2°D, 28034, Madrid, Spain

    E. García-Rey & E. García-Cimbrelo

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  1. E. García-Rey
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  2. E. García-Cimbrelo
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Correspondence to E. García-Rey.

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García-Rey, E., García-Cimbrelo, E. Clinical and radiographic results and wear performance in different generations of a cementless porous-coated acetabular cup. International Orthopaedics (SICO 32, 181–187 (2008). https://doi.org/10.1007/s00264-006-0305-6

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  • DOI: https://doi.org/10.1007/s00264-006-0305-6

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