Table of Contents
ISRN Orthopedics
Volume 2013, Article ID 308753, 6 pages
http://dx.doi.org/10.1155/2013/308753
Research Article

Comparing the In Vitro Stiffness of Straight-DCP, Wave-DCP, and LCP Bone Plates for Femoral Osteosynthesis

Laboratory of Biomaterials in Orthopedics, School of Medical Sciences, University of Campinas (UNICAMP), 126 Rua Tessália Vieira de Camargo, 13083-887 Campinas, SP, Brazil

Received 7 January 2013; Accepted 28 January 2013

Academic Editors: M. Hasegawa, S. Kamineni, and T. Van Raaij

Copyright © 2013 José Ricardo Lenzi Mariolani and William Dias Belangero. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The objective of this study was to compare the Locking Compression Plate (LCP) with the more cost-effective straight-dynamic compression plate (DCP) and wave-DCPs by testing in vitro the effects of plate stiffness on different types of diaphyseal femur fractures (A, B, and C, according to AO classification). The bending structural stiffness of each plate was obtained from four-point bending tests according to ASTM F382-99(2008). The plate systems were tested by applying compression/bending in different osteosynthesis simulation models using wooden rods to simulate the fractured bone fragments. Kruskal-Wallis test showed no significant difference in the bending structural stiffness between the three plate models. Rank-transformed two-way ANOVA showed significant influence of plate type, fracture type, and interaction plate versus fracture on the stiffness of the montages. The straight-DCP produced the most stable model for types B and C fractures, which makes its use advantageous for complex nonosteoporotic fractures that require minimizing focal mobility, whereas no difference was found for type A fracture. Our results indicated that DCPs, in straight or wave form, can provide adequate biomechanical properties for fixing diaphyseal femoral fractures in cases where more modern osteosynthesis systems are cost restrictive.