Mixing of head-stem components in total hip arthroplasty

• Verfasst von: Müller, Ulrike [VerfasserIn]
• Verfasst von: Panzram, Benjamin [VerfasserIn]
• Verfasst von: Braun, Steffen [VerfasserIn]
• Verfasst von: Sonntag, Robert [VerfasserIn]
• Verfasst von: Kretzer, Jan Philippe [VerfasserIn]
• Titel: Mixing of head-stem components in total hip arthroplasty
• Verf.angabe: Ulrike Mueller, Benjamin Panzram, Steffen Braun, Robert Sonntag, J. Philippe Kretzer
• Jahr: 2018
• Jahr des Originals: 2017
• Umfang: 7 S.
• Fussnoten: Available online 1 November 2017 ; Gesehen am 15.08.2018
• Titel Quelle: Enthalten in: The journal of arthroplasty
• Ort Quelle: Orlando, Fla. : Churchill Livingstone, 1986
• Jahr Quelle: 2018
• Band/Heft Quelle: 33(2018), 3, Seite 945-951
• ISSN Quelle: 1532-8406
• DOI: doi:10.1016/j.arth.2017.10.047
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: head-stem connection
• Sach-SW: mix and match
• Sach-SW: modularity
• Sach-SW: Morse taper
• Sach-SW: torque-off moments
• Sach-SW: total hip replacement
• K10plus-PPN: 1580060307

Abstract

Background: Implant manufacturers proclaim that the tapers of modular total hip arthroplasty are not standardized and can vary from manufacturer to manufacturer. That is why the combination of various components from different manufacturers (“Mix and Match”) is not permitted. In this study, different taper combinations were investigated experimentally to assess the effect of “Mix and Match” regarding the taper connection strength. Methods: Torque-off tests using hip stems and metal femoral heads from 6 different implant manufacturers were performed. First the components were tested as intended and afterwards the stems were combined with metal heads from other manufacturers. Results: There was no significant difference in taper connection strength when stems from the manufacturers Link, Smith & Nephew, and Zimmer were combined with heads from other manufacturers. The Biomet stems showed a significantly reduced taper connection strength if femoral heads of Aesculap, DePuy, or Smith & Nephew were used. On the contrary, the DePuy stems in combination with the originally intended femoral heads showed a significantly lower taper connection strength compared to the use of heads from Link, Biomet, and Zimmer. The same was observed for the Aesculap stems in combination with Zimmer heads. Conclusion: The results of this study suggest that mixing components from different manufacturers may affect the taper connection strength and could reduce the stability. As safety should be a high priority in patient treatment, any potential risks should be avoided. Therefore, mixing and matching of heads and femoral stems from different manufacturers cannot be recommended.