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The femoral cement mantle in three total hip replacements

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Abstract

We measured the size and volume of the femoral broaches and stems supplied with three commercial total hip replacement (THR) systems (JRI Furlong, Biomet Stanmore, and Howmedica Exeter). Using an in vitro method, we created cement mantles that could be directly measured. The broaches supplied with the Biomet Stanmore and the Howmedica Exeter systems allowed the creation of significantly thicker cement mantles than the JRI broaches and stems (Stanmore mean thickness = 1.7 mm, defects at 3% of measurement sites; Exeter mean thickness = 2.0 mm, no defects; JRI mantles mean thickness = 0.9 mm, cement defects at 29% of measurement sites). We conclude that, in vivo, the broaches supplied with the Stanmore and Exeter systems are significantly larger than the corresponding stems, and will excavate a cavity large enough to accommodate the appropriate femoral stem surrounded by an intact cement mantle.

Résumé

Nous avons mesuré la dimension et le volume des alésoirs fémoraux et des tiges fournis avec trois systèmes commerciaux de PTH (Furlong JRI, Biomet Stanmore, Howmedica Exeter). Utilisant une méthode in vitro, nous avons créé des manteaux de ciment qui pouvaient être mesurées directement. Les alésoirs des systèmes Biomet Stanmore et Howmedica Exeter ont autorisé la création de manteaux de ciment considérablement plus épais que dans le système JRI (Stanmore épaisseur moyenne = 1.7 mm, défauts sur 3% d’emplacements de la mesure; Exeter épaisseur moyenne = 2.0 mm, aucuns défauts; JRI épaisseur moyenne = 0.9 mm, défauts du ciment à 29% d’emplacements de la mesure). Nous concluons que, in vivo, les alésoirs fournis avec les systèmes Stanmore et Exeter sont nettement plus grands que les tiges correspondantes, et font une cavité assez grande pour recevoir la tige fémorale appropriée entourée par d’une manteau de ciment intact.

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Acknowledgement

We would like to thank Mr. D. Hitchin at The University of Sussex, and Mr. R. Newson at King’s College, London, for statistical advice. We are also indebted to Joint Replacement Instrumentation Ltd., Biomet, and Stryker Howmedica for providing femoral stems and broaches.

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Correspondence to S. J. Mellor.

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This research was supported in part by a grant from The Sprint Fund. No benefits of any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

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Mellor, S.J., Ripley, L.G. & Ricketts, D.M. The femoral cement mantle in three total hip replacements. International Orthopaedics (SICOT) 28, 40–43 (2004). https://doi.org/10.1007/s00264-003-0509-y

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