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Die mediale Abstützung bei der Frakturversorgung am proximalen Humerus durch eine retrograde Nagelosteosynthese – biomechanische und klinische Aspekte

Medial support for treatment of fractures of the proximal humerus by retrograde nail osteosynthesis: biomechanical and clinical aspects

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Zusammenfassung

Bei Frakturen des proximalen Humerus stellt eine mediale metaphysäre Trümmerzone ein Problem dar, weil diese Frakturen dazu neigen, trotz Osteosynthese, sekundär in eine Varusfehlstellung abzurutschen. In der Literatur wurde die Bedeutung von inferomedialen Schrauben für die mediale Stabilisierung erkannt. Diese gilt heute als wesentliche Voraussetzung für eine dauerhafte stabile Versorgung. Trotz dieser Abstützung kann es zu einer sekundären Varusfehlstellung kommen. Von verschiedenen Autoren wurden enostale allogene Knochentransplantate, die zusätzlich zu einer winkelstabilen Plattenosteosynthese implantiert wurden, als geeignete Augmentation beschrieben. Dieses Verfahren ist allerdings in der Anwendung deutlich limitiert und scheint für einen flächendeckenden Einsatz nicht geeignet. Ein neu entwickelter, retrograder Nagel erfüllt aus theoretischer Sicht sämtliche Kriterien für eine stabile Osteosynthese proximaler Humerusfrakturen, inkl. der medialen Abstützung.

In der vorliegenden Arbeit werden die Problematik der medialen Instabilität proximaler Humerusfrakturen dargelegt und biomechanische und erste klinische Ergebnisse mit dem retrograden proximalen Humerusnagel beschrieben.

Abstract

In proximal humerus fractures with medially comminuted metaphyses, secondary varus malalignment is one of the major difficulties for the trauma surgeon. Recent studies stressed the importance of inferomedial screws for medial support. These screws were found to be one of the most influencing factors for stable osteosynthesis. Despite proper placement of these screws secondary varus dislocation can still happen. Some authors suggested enostal allografts in addition to locking plates for medial support; however, for many reasons this method is and will remain an exception. A recently developed retrograde nail for the proximal humerus fulfills, from a theoretical point of view, all aspects for a sufficient fixation of proximal humerus fractures, including medial support. This article discusses the need for and difficulties of a sufficient inferomedial support in proximal humerus fractures and discuss the biomechanical findings and first clinical experiences with this new device.

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Der korrespondierende Autor gibt für sich und seine Koautoren an, dass kein Interessenkonflikt besteht.

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Correspondence to S. O. Dietz.

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Dietz SO und Sohlbach D haben gleichberechtigt zur Erstellung des Artikels beigetragen.

Einzelne klinische Fälle sind Bestandteil der Dissertationsarbeit von Sohlbach D. Teile der Ergebnisse wurden bereits publiziert (4).

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Dietz, S., Sohlbach, D., Küchle, R. et al. Die mediale Abstützung bei der Frakturversorgung am proximalen Humerus durch eine retrograde Nagelosteosynthese – biomechanische und klinische Aspekte. Obere Extremität 7, 221–227 (2012). https://doi.org/10.1007/s11678-012-0184-y

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  • DOI: https://doi.org/10.1007/s11678-012-0184-y

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