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Comparative Study
. 2009 Aug;33(4):939-43.
doi: 10.1007/s00264-008-0607-y. Epub 2008 Jul 4.

Ten different hip resurfacing systems: biomechanical analysis of design and material properties

Christian Heisel  1 , Jennifer A Kleinhans, Michael Menge, Jan Philippe Kretzer
Affiliations
Comparative Study

Ten different hip resurfacing systems: biomechanical analysis of design and material properties

Christian Heisel et al. Int Orthop. 2009 Aug.

Abstract
in English, French

This study gives an overview of the main macro- and microstructural differences of ten commercially available total hip resurfacing implants. The heads and cups of resurfacing hip implants from ten different manufacturers were analysed. The components were measured in a coordinate measuring machine. The microstructure of the heads and cups was inspected by scanning electron microscopy. The mean radial clearance was 84.86 microm (range: 49.47-120.93 microm). The implants were classified into three groups (low, medium and high clearance). All implants showed a deviation of roundness of less than 10 microm. It was shown that all implants differ from each other and a final conclusion about the ideal design and material combination cannot be given based on biomechanical data. Widespread use of specific designs can only be recommended if clinical long-term follow-up studies are performed and analysed for each design.

Le but de ce travail est d’évaluer les différences observées de 10 implants différents de resurfaçage de la hanche. Matériel et méthode: les têtes et les cupules de différents fabricants ont été analysées. Les différents composants ont été mesurés dans une machine particulière. La micro-structure des têtes et des cupules a été également analysée par microscopie électronique. Résultats: la clearance radiale moyenne a été de 84,86 μm (de 49,47 μm à 120,93 μm). Les implants ont été classés en trois groupes (basse, moyenne et haute clearance). Tous les implants montrent un écart de sphéricité de 10 μm. En conclusion: il est clair que tous les implants diffèrent l’un de l’autre et que le design idéal se situe entre les différentes combinaisons d’implants et ne peuvent être basés sur les données biomécaniques. Une diffusion des designs les plus répandus peut seulement être recommandée après un suivi à long terme analysé pour chaque type d’implant.

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Figures

Fig. 1
Fig. 1
Scanning electron microscopy of a wrought compared to an as cast and a heat-treated casted implant surface (left to right)
See this image and copyright information in PMC

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