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The fixation of porous-coated femoral stems

A radiographic study of 113 cases with a 4 to 8 year follow up

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Summary

Changes occurring in the fixation of 113 porous-coated PCA uncemented femoral stems were studied in 90 patients who were operated on between 1984 and 1988. The average follow up was 5 years. Fixation was classified in radiographs as osteointegration, stable fibrous fixation or unstable. Four femoral components were revised. Metaphyseal osteoporosis was associated with those with a stem diameter greater than 13 mm. After 2 years, osteointegration was present in 73% and instability in 24% which was not related to the position of the stem. At the end of the follow up period, 20% of the stems showing osteointegration had changed and become unstable.

Résumé

Nous avons étudié les modifications dans le temps de la fixation de la pièce fémorale sur une série consécutive de 113 prothèses PCA (Howmedica) non cimentées, réalisées chez 90 patients de 1984 à 1988. Le recul moyen était de 5 ans. La fixation a été classée radiologiquement on rois catégories: ostéointégration, fixation fibreuse stable et fixation instable. Quatre malades ont été réopérés. L'ostéoporose proximale a été trouvée en relation avec un diamètre de la tige fémorale supérieur à 13 mm (p<0.001). Après 2 ans il y avait ostéointégration dans 73% des cas et instabilité dans 24%, sans aucun rapport avec la position de la prothèse. En fin de surveillance 20% des pièces ostéointégrées étaient devenues instables.

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Authors and Affiliations

  1. Department of Orthopaedics, Hospital “La Paz”, Universidad Autónoma de Madrid, Spain

    L. Munuera, E. Garcia-Cimbrelo & J. Cordero

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  1. L. Munuera
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  2. E. Garcia-Cimbrelo
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  3. J. Cordero
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Munuera, L., Garcia-Cimbrelo, E. & Cordero, J. The fixation of porous-coated femoral stems. International Orthopaedics 19, 212–216 (1995). https://doi.org/10.1007/BF00185224

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