Archive (2005–2015)

Comparison of double locking plate constructs with single non-locking plate constructs in single cycle to failure in bending and torsion

Journal: Veterinary and Comparative Orthopaedics and Traumatology (VCOT)
ISSN: 0932-0814
DOI: https://doi.org/10.3415/VCOT-14-09-0149
Issue: 2015: Issue 4 2015
Pages: 234-239
Ahead of Print: 2015-06-03

Comparison of double locking plate constructs with single non-locking plate constructs in single cycle to failure in bending and torsion

K. D. Hutcheson (1), J. R. Butler (1), S. E. Elder (2)

(1) College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA; (2) Department of Agricultural & Biological Engineering, Mississippi State University, Mississippi State, MS, USA

Keywords

torsion, implant failure, bending, String-of-Pearls, broad dynamic compression plate

Summary

Objective: To evaluate the biomechanical properties of single 3.5 mm broad dynamic compression plate (DCP) and double 3.5 mm String-of-Pearls (SOP) plate constructs in single-cycle bending and torsion. We hypothesized that the double SOP construct would outperform the broad DCP in both bending and torsional testing. Methods: Broad DCP plates and double 3.5 mm SOP plates were secured to a previously validated bone model in an effort to simulate bridging osteosynthesis. Constructs were tested in both four-point bending and torsional testing. Results: The double SOP constructs had significantly greater bending stiffness, bending strength, bending structural stiffness, and torsional stiffness when compared to the broad DCP constructs. The single broad DCP constructs had significantly higher yield torque and yield angles during torsional testing. Clinical relevance: Although the in vitro mechanical performance of the double SOP construct was significantly greater than the single broad DCP constructs under bending loads, the actual differences were small. Various patient, fracture, and implant factors must be considered when choosing an appropriate implant for fracture fixation.

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