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Title: Screw locking elements: A means to modify the flexibility of osteoporotic fracture fixation with DCPs without compromising system strength or stability
Authors: Yánez, A. 
Cuadrado, A. 
Carta, J. A. 
Garcés, G.
Keywords: Far Cortical Locking
Compression Plate
Mechanical Validation
Locked Plates
Bone Plates, et al
Issue Date: 2012
Publisher: 1350-4533
Journal: Medical Engineering and Physics 
Abstract: This paper analyses whether it is possible to use dynamic compression plates (DCPs) and screw locking elements (SLEs) to vary the flexibility of osteoporotic fracture fixation without compromising the strength and stability of the construct.Compression, torsion and four-point bending static strength tests were conducted. Cyclic load tests of up to 10,000 load cycles were also carried out to determine stiffness performance. Four fixation systems were mounted onto polyurethane bone models. Group 1 consists of the DCP and six cortical screws. Group 2, idem, but with the addition of two SLEs. Group 3, idem, but with the addition of six SLEs. Group 4 used the locking compression plate (LCP) and locking screws.The results indicated no significant difference (p > 0.05) in the strength of groups 2-4. It was also observed that the torsional stiffness of group 3 (0.30 N m/degrees) was higher than that of group 2 (0.23 N m/degrees) and similar to that of group 4(0.28 N m/degrees). Compression stiffness of group 4 (124 N/mm) was higher than that of group 2 (102 N/mm), but lower than that of group 3 (150 N/mm). No notable differences were observed for structural bending stiffness.It is concluded that by using the DCP with SLEs it is possible to modify the stiffness of the fixation construct for the repair of osteoporotic fractures and, in this way, facilitate the conditions suitable on secondary bone healing. (C) 2011 IPEM. Published by Elsevier Ltd. All rights reserved.
ISSN: 1350-4533
DOI: 10.1016/j.medengphy.2011.09.015
Source: Medical Engineering and Physics[ISSN 1350-4533],v. 34, p. 717-724
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