Distal Radius

Volar Fixed-Angle Plating of Extra-Articular Distal Radius Fractures—A Biomechanical Analysis Comparing Threaded Screws and Smooth Pegs

Weninger P, Dall’Ara E, Leixnering M, et al (Lorenz Boehler Trauma Hosp, Vienna, Austria; Vienna Univ of Technology, Austria; et al) J Trauma 69:E46-E55, 2010^§

Abstract

Background

Distal radius fractures represent the most common fractures in adult individuals. Volar fixed-angle plating has become a popular modality for treating unstable distal radius fractures. Most of the plates allow insertion of either threaded locking screws or smooth locking pegs. To date, no biomechanical studies compare locking screws and pegs under axial and torsional loading.

Methods

Ten Sawbones radii were used to simulate an AO/OTA A3 fracture. Volar fixed-angle plates (Aptus Radius 2.5, Medartis, Switzerland) with threaded locking screws (n = 5) or smooth locking pegs (n = 5) were used to fix the distal metaphyseal fragment. Each specimen was tested under axial compression and under torsional load with a servohydraulic testing machine. Qualitative parameters were recorded as well as axial and torsional stiffness, torsion strength, energy absorbed during monotonic loading and energy absorbed in one cycle.

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