CC BY 4.0 · VCOT Open 2020; 03(02): e119-e128
DOI: 10.1055/s-0040-1716722
Original Article

Effect of Plate Type and Working Length on a Synthetic Compressed Juxta-Articular Fracture Model

Guy Bird
1  College of Veterinary Medicine, Murdoch University, Perth, Australia
,
Mark Glyde
1  College of Veterinary Medicine, Murdoch University, Perth, Australia
,
Giselle Hosgood
1  College of Veterinary Medicine, Murdoch University, Perth, Australia
,
Alex Hayes
2  Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia
,
Rob Day
2  Department of Medical Engineering and Physics, Royal Perth Hospital, Perth, Australia
› Author Affiliations

Abstract

Objective This investigation compared the biomechanical properties of a 2.0 mm locking compression notched head T-plate (NHTP) and 2.0 mm straight locking compression plate (LCP), in a compressed, short, juxta-articular fragment fracture model.

Methods Two different screw configurations were compared for the NHTP and LCP, modelling short (configuration 1) and long working length (configuration 2). Constructs were tested in compression, perpendicular and tension four-point bending and torsion. Plate surface strain was measured at 12 regions of interest using three-dimensional digital image correlation. Stiffness and strain were compared.

Results The LCP was stiffer than the NHTP in all three planes of bending (p < 0.05). The NHTP was stiffer than the LCP in torsion (p < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion (p < 0.0005). The short working length NHTP was stiffer in all three planes of bending and in torsion (p < 0.05) than the longer working length. The short working length LCP was stiffer in compression bending and in torsion (p < 0.05) than the longer working length. The long working length showed greater strain than the short working length at multiple regions of interest.

Conclusion In this experimental model of a compressed transverse fracture with a juxta-articular 9 mm fragment, a 2.0 mm LCP with two hybrid screws in the short fragment was stiffer than a 2.0 mm NHTP with three locking screws in the short fragment in three planes of bending but not torsion. Extending the working length of each construct reduced construct stiffness and increased plate strain.

Authors' Contributions

All the authors conceptualized and designed the study. G.B., M.G., G.S. acquired the data. G.B., M.G., R.D., A.H. acquired the data. G.B., M.G., G.H., R.D. revised the manuscript critically. All the authors interpreted the data.




Publication History

Received: 27 July 2020

Accepted: 10 August 2020

Publication Date:
26 September 2020 (online)

© .

Georg Thieme Verlag KG
Stuttgart · New York