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[Comparative study on the strength of different mechanisms of operation of multidirectionally angle-stable distal
S Rausch1, K Hoffmeier, B G Gueorguiev
1Klinik für Unfall-, Hand- und Wiederherstellungschirurgie, Klinikum der Friedrich-Schiller-Universität Jena, Erlanger Allee 102, Jena. sascha.rausch@med.uni-jena.de
Introduction:
Polyaxial angle-stable plating is thought to be particularly beneficial in the management of complex intra-articular fractures of the distal radius. The present study was performed to investigate the strength of polyaxial locking interfaces of distal radius plates.
Material And Methods:
We tested the polyaxial interfaces of 3 different distal radius plates (2.4 mm Variable Angle LCP Two-Column Volar Distal Radius Plate, Synthes, Palmar Classic, Königsee Implantate and VariAx Plate Stryker). The strength of 0° and 10° screw locking angle was obtained during static loading.
Results:
The strength of Palmar Classic with a 0° locking angle is significantly the best of all tested systems. With a 10° locking angle there is no significant difference between Palmar Classic, Two column Plate and VariAx Plate.
Conclusion:
The strength of polyaxial interfaces differs between the tested systems. A reduction of ultimate strength is due to increases of screw locking angle. The design of polyaxial locking interfaces should be investigated in human bone models.
