Biomechanical behaviour of implant-reinforced subcapital humeral fractures

B. Füchtmeier; J. Hammer; M. Nerlich

doi:10.3139/ijmr-2002-0137

Article

Biomechanical behaviour of implant-reinforced subcapital humeral fractures

B. Füchtmeier , J. Hammer and M. Nerlich

Published/Copyright: January 3, 2021

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From the journal International Journal of Materials Research Volume 93 Issue 8

Abstract

A pair-controlled study was performed to compare the biomechanical behaviour of implant-reinforced fractured humeri under bending and under torsional loading, respectively. Special interest is related to the fixation potential of a prototype version of an intramedullary nail for stabilisation of subcapital humeral fracture. This nail is especially designed in terms of application for less invasive surgery purposes. In this study, two different modifications of this prototype nail are directly compared with respect to the stabilisation potential in direct comparison to conventionally applied implant techniques (wire technique and plate fixing). First results indicate that fixing of subcapital fracture by this intramedullary nail type provides a good compromise concerning the stabilisation under both loading types, bending and torsion, respectively.

Abstract

Das biomechanische Verhalten implantat-verstärkter gebrochener Oberarmknochen wurde unter Biege- und unter Torsionsbelastung untersucht. Von besonderem Interesse war das Stabilisierungspotential eines minimal invasiv implantierbaren Marknagel-Prototyps zur Fixierung subkapitaler Humerusbrüche. Im Rahmen dieser Untersuchung wurden zwei Modifikationen dieses neuen Marknagels hinsichtlich ihrer Stabilisierungsqualität untersucht und direkt mit den Ergebnissen von mit konventioneller Implantattechnik fixierten Brüchen (K-Drähte und T-Platte) verglichen. Erste Ergebnisse belegen, dass dieser neue Marknagel einen sehr guten Kompromiss hinsichtlich der Stabilisierung sub-kapitaler Brüche des Humerus sowohl unter Biege- als auch unter Torsionsbelastung darstellt.

Keywords: Intramedullary nailing; Proximal humeral fractures; Less invasive fixation; Mechanical stability; Biomechanical behaviour

Prof. Dr.-Ing. J. Hammer Fachhochschule Regensburg Galgenbergstr. 30, D-93053 Regensburg Tel.: +49 941 943 5153 Fax: +49 941 943 1428

Dedicated to Professor Dr. Haël Mughrabi on the occasion of his 65th birthday

The authors thank R. Jacobsen for preparing and conducting the mechanical experiments, and as well H.-P. Bräu, F. Rauscher and M. All-meier for technical assistance. Special thanks are due to S. Schrammel for support concerning electronic questions and to E. Steinberger for preparing the figures.

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Received: 2002-02-20

Published Online: 2021-01-03

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Articles in the same Issue

https://doi.org/10.3139/ijmr-2002-0137

Keywords for this article

Intramedullary nailing; Proximal humeral fractures; Less invasive fixation; Mechanical stability; Biomechanical behaviour