About this item:

316 Views | 954 Downloads

Author Notes:

Correspondence: angela.lin@gatech.edu.

AL was responsible for the experimental design, test performance, test data analysis and compilation, result interpretation, and manuscript writing and editing.

CF was responsible for the test performance, test data analysis, and manuscript editing.

MM was responsible for the experimental design, plate contouring, result interpretation, and manuscript editing.

FW was responsible for the experimental design, assistance with the preliminary test setup, and manuscript editing.

TM was responsible for the experimental design, result interpretation, and manuscript editing.

RG was responsible for the experimental design, result discussions and interpretation, and manuscript editing.

We thank Michel Vallotton and Claudia Beimel from Stryker for their expertise in the experimental protocol development and statistical analysis, respectively, and John Heflin, MD, from the Department of Orthopaedics, University of Utah, for the advice during the experimental concept development.

Competing interests: FW is an employee of Stryker Trauma AG. The other authors declare that they have no competing interests.

The full datasets generated and analyzed in the present work are available from the corresponding author on reasonable request.

Subjects:

Research Funding:

Stryker Trauma AG provided the funding and materials for this study but had no role in the collection, analysis, or interpretation of the data.

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Orthopedics
  • Bone plates
  • Bone fractures
  • Fracture fixation
  • MM LOCKING
  • GAP MODEL
  • STIFFNESS
  • SURGERY
  • DESIGN

The effect of contouring on fatigue resistance of three types of fracture fixation plates

Tools:

Journal Title:

Journal of Orthopaedic Surgery and Research

Volume:

Volume 11, Number 1

Publisher:

, Pages 107-107

Type of Work:

Article | Final Publisher PDF

Abstract:

Background: Metallic reconstruction plates used for fracture stabilization typically require intraoperative contouring for patient-specific anatomical fit. Despite this, characterization of plate mechanical properties after contouring has previously been limited. The objective of this study was to assess whether contouring affects fatigue resistance for three types of Stryker seven-hole stainless steel (SS) 316LVM fracture fixation plates. The hypothesis was that for each plate type, more contouring repetitions would result in lower fatigue resistance. Methods: Plates were contoured using a bench-top plate bender to ±20° either 0×, 3×, 6×, or 9× (n = 5 per group) and tested in the straight configuration. Cyclic four-point bending was applied in an incremental stepwise staircase approach (one step = 100,000 cycles, 10 Hz) until failure (defined as brittle fracture or plastic deformation of 10° permanent bend). Moment-cycle product (MCP) was computed as the summation of maximum moment × number of cycles and used as the primary measure of fatigue resistance. Results: No significant differences in fatigue resistance were detected between contouring groups for Basic Fragment Set (BFS) Reconstruction Plates. Significantly lower fatigue resistance was measured for 9× contoured Matta Pelvic System (MPS) Straight Plates compared to 0× contoured plates (p = 0.023). MPS Flex Plates contoured 3× had greater fatigue resistance than 0× contoured (p = 0.031) and 9× contoured plates (p = 0.032). Conclusions: This work provides fatigue resistance-based evidence that clinicians should avoid high repetitions of contouring for MPS Straight Plates. Meanwhile, BFS Reconstruction Plates and MPS Flex Plates are not negatively affected by contouring. These results allow for improved intraoperative decisions about using or discarding plates after multiple contouring repetitions.

Copyright information:

© 2016 The Author(s). The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

This is an Open Access work distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).
Export to EndNote