Abstract
Between January 1986 and December 1988, we implanted 220 conical-shaped Zweymueller threaded cups in 202 patients whose average age was 65 (33–83) years. The average thickness of the polyethylene (PE) insert was 8.0 (5.4–11.9) mm. In 142 cases, the corresponding femoral head was a 32 mm Al2O3 head. We followed 157 patients for a mean of 9.2 (1–16) years. Nine cups were revised and ten PE inserts replaced after an average of 11.9 (10–13.3) years. With cup revision alone considered as failure, the survival rate after 13 years was 89%. When both cup and insert revisions were considered failures, the survival rate decreased to 72% after 13 years. Patients younger than 60 years had a significantly higher rate of insert revision. Cup size 55 showed significantly more revisions in comparison to larger sizes. Using Cox regression model, neither gender, body mass index, nor material were risks factors leading to cup revision.
Résumé
Entre janvier 1986 et décembre 1988 nous avons implanté 220 cupules acétabulaire coniques et filetées de Zweymueller chez 202 malades avec un âge moyen de 65 (33–83) années. L’épaisseur moyenne de l’insert de polyéthylène était 8.0 (5.4–11.9) mm. Dans 142 cas la tête fémorale correspondante était une tête de 32 mm en Al2O3. 157 malades ont été suivis pendant une moyenne de 9.2 (1–16) années. Neuf cupules ont été révisées et dix inserts de polyéthylène ont été remplacé après une moyenne de 11.9 (10–13.3) années. Avec la révision de la cupule seule considérée comme échec le taux de la survie après 13 années était 89% .Avec la révision de cupule et d’insert considérés comme échecs, le taux de la survie a diminué à 72% après 13 années. Les malades âgés de moins de 60 ans avaient un plus haut taux de révision de l’insert. Les cupule de 55 mm avaient plus de révisions que les cupules de plus grandes dimensions. En utilisant le modèle de Cox, ni le sexe, ni l’index de masse corporelle ni le matériau n’était des facteurs de risque menant à la révision de la cupule.
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Acknowledgments
The authors would like to thank Elmar Kißlinger, MD, Bad Abbach, Germany for his statistical analysis. The study was supported by a grant from the Austrian National Bank (Grant 8662) and by the Association for the Promotion of Research and Continuing Education in the Field of Orthopaedics in Salzburg.
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