Reverse Oblique End Screws in Nonlocking Plates Decrease Construct Strength in Synthetic Osteoporotic Bone Medium

Document Type

Article

Publication Date

6-1-2015

Publication Title

Journal of Surgical Orthopaedic Advances

Abstract

Fracture stability can be challenging for osteoporotic individuals. The end screw of nonlocked plates is subjected to the greatest loading and is typically the site of construct failure. To enhance fixation, the end screw can be angled away from the fracture. The current study biomechanically evaluated screws angled the other direction: toward the fracture using 3.5-mm dynamic compression plates in an osteoporotic bone model. Three different plate lengths (6-, 8-, 12-hole) were tested in three-point bending with an oblique, perpendicular, or reverse oblique end screw. The peak load for loss of screw fixation for the reverse oblique end screw constructs was significantly less than the other screw orientations for all plate lengths. The 12-hole peak load, energy, and displacement magnitudes for all three screw orientations were significantly greater than all 6- and 8-hole constructs. The use of a reverse oblique end screw is inferior to both perpendicular and oblique end screws.

Volume

24

Issue

2

First Page

130

Last Page

136

ISSN

Print ISSN: 1548-825X, Online ISSN: 2158-3811

Rights

© 2015 JSOA Online

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