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Implant wear and osteolysis with a hydroxylapatite-coated screw cup

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Abstract

Radiographs of 72 uncemented hip implants with a mean follow-up of 6.5 years were analysed to measure wear of the implant. The wear rate was measured using the modified technique of Livermore and was found to be 0.13 mm per year (CI 95% 0.080–0.18). There was no statistical correlation between wear and age, gender and cup angle, but there was a correlation between wear and the number and size of cysts. This has not been previously published. In view of the risk of loosening and of a dramatic increase in the rate of wear when the femoral head articulates with the metal backing, it is important to plan revision of these cups in good time and to ensure regular radiographic surveillance of these patients.

Résumé

Nous avons étudié les radiographies de 72 prothèses de la hanche non-cimentées (Landos, France) pour mesurer l'usure de l'insert acétabulaire. Le suivi moyen était 6,5 années. L'usure a été mesuré avec la technique modifiée de Livermore, comme décrit par Rokkum et Reigstad. L'usure par an était 0,13 mm (CI 95% 0,080–0,18). Aucune corrélation statistique n'a été trouvée entre usure et âge, genre et angle de la cupule. Cependant une corrélation significative a été trouvée entre l'usure et la quantité de kystes acétabulaires. Le haut taux d'usure a déjà été publié avec une tête fémorale différente mais la corrélation statistique entre taux d'usure et formation de kystes ne l'a pas été. À cause du risque de descellement et d'usure quand le col fémoral entre en contact avec la cage de métal, il est important de suivre ces malades régulièrement et de prévoir une révision dans le temps.

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Correspondence to I. C. Heyligers.

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van Haaren, E.H., Heyligers, I.C. Implant wear and osteolysis with a hydroxylapatite-coated screw cup. International Orthopaedics (SICOT) 27, 282–285 (2003). https://doi.org/10.1007/s00264-003-0479-0

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  • DOI: https://doi.org/10.1007/s00264-003-0479-0

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