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The effectiveness of the proximal femoral stem centraliser on the stem alignment in total hip replacement

  • Almunir YousefEmail author
  • Angus Wallace
Original Article
  • 93 Downloads

Abstract

We studied a new polymethylmethacrylate proximal femoral centraliser designed for use along with the distal femoral centraliser. Using cadaver femora we conducted an in vitro study to measure the influence of the proximal centraliser on the cement mantle and femoral stem alignment in a total hip replacement (THR). The cadaver femora were randomised into two groups. The Royal National Orthopaedic Hospital (RNOH) femoral stems were inserted to each femur using third-generation cementing technique .The first group was inserted using proximal and distal centralisers. The second group was inserted using distal centralisers only. All the hip specimens were X-rayed using high-tech scanner and computer software. The stem alignment and cement mantle were measured. We concluded that the proximal femoral centraliser improved the cement mantle distribution and femoral stem alignment in THR. This improvement will reflect on the long-term survival of the THR. We also showed an excellent and accurate way of measuring the femoral stem alignment in THR.

Keywords

Total hip replacement Femoral stem Cementing Centraliser 

Efficience du centreur fémoral proximal de la tige des PTH

Résumé

Nous avons étudié un nouveau centreur proximal en polyméthylméthacrilate (PMMA) prévu pour être utilisé avec le centralisateur distal. Grâce à des fémurs de cadavres, nous avons étudié in vitro l’influence du centreur proximal sur le manteau de ciment et sur le positionnement de la tige fémorale des prothèses totales de hanche (PTH). Les fémurs de cadavres ont été randomisés en deux groupes. Des tiges de type « Royal National Orthopaedic Hospital » (RNOH) ont été implantés dans chaque fémur en suivant la technique de cimentage de troisième génération : le premier groupe avec les deux centreurs, proximal et distal ; le second groupe en n’utilisant que le seul centreur distal. Toutes les hanches ont été radiographiées avec un scanner de haute technologie et une gestion par ordinateur. L’alignement des tiges et la qualité du manteau de ciment ont été mesurés. Nous avons pu conclure que l’utilisation du centreur proximal améliore le positionnement de la tige prothétique ainsi que la qualité du manteau de ciment dans les PTH. Cette amélioration se répercutera sur la durée de vie de la PTH. Nous avons également démontré une excellente et fiable façon de mesurer le positionnement de la tige fémorale des PTH.

Mots clés

Prothèse totale de hanche Tige fémorale Cementage Centreur 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Orthopaedic DepartmentKing’s Mill HospitalNottsUK
  2. 2.Orthopaedic DepartmentQueen’s Medical CentreNottinghamUK

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