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Comparative Study
. 2009 Dec;33(6):1531-6.
doi: 10.1007/s00264-009-0729-x. Epub 2009 Feb 14.

Metal release and corrosion effects of modular neck total hip arthroplasty

J Philippe Kretzer  1 , Eike Jakubowitz, Michael Krachler, Marc Thomsen, Christian Heisel
Affiliations
Comparative Study

Metal release and corrosion effects of modular neck total hip arthroplasty

J Philippe Kretzer et al. Int Orthop. 2009 Dec.

Abstract
in English, French

Modular neck implants are an attractive treatment tool in total hip replacement. Concerns remain about the mechanical stability and metal ion release caused by the modular connection. Five different implant designs were investigated in an experimental set-up. In vivo conditions were simulated and the long-term titanium release was measured. Finally, the modular connections were inspected for corrosion processes and signs of fretting. No mechanical failure or excessive corrosion could be identified for the implants tested. The titanium releases measured were extremely low compared to in vivo and in vitro studies and were not in a critical range.

Dans les prothèses totales de hanche l’utilisation d’implants avec col modulaire est d’une utilisation fréquente et pratique. Néanmoins, cette utilisation laisse persister des doutes sur la stabilité mécanique et sur le relargage des ions métalliques. 5 différents implants ont été étudiés en reproduisant les conditions in vivo, en mesurant le relargage de titane et en évaluant la corrosion et les lésions du col. Ce travail n’a pas permis de mettre en évidence d’échec secondaire à une corrosion excessive, et les taux de titane sont restés extrêmement bas dans les limites de l’acceptable.

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Figures

Fig. 1
Fig. 1
Implant designs investigated. The oval modular taper of the two designs on the right side are female connections
Fig. 2
Fig. 2
Alignment of the stem and modular neck relative to spatial coordinates. The peristaltic pump continuously circulates serum between the fluid reservoir and simulation chamber
Fig. 3
Fig. 3
Titanium release of the five implant designs during the course of simulation
Fig. 4
Fig. 4
Fretting scars run perpendicular to machine lines
See this image and copyright information in PMC

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