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Journal of Orthopaedic Surgery and Research
Published in: Journal of Orthopaedic Surgery and Research 1/2018

Open Access 01-12-2018 | Research article

Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures

Authors: Jiantao Li, Menglin Wang, Lianting Li, Hao Zhang, Ming Hao, Chen Li, Lin Han, Jianfeng Zhou, Kun Wang

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2018

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Abstract

Background

In the present study, we evaluated the mechanical outcome of different configurations formed by fully threaded screws and partially threaded screws in the treatment of unstable femoral neck fracture.

Methods

The Pauwels type III unstable femoral fracture and the models of the fully threaded screw and partially threaded screw were constructed in 3-matic software and UG-NX software respectively. We then assembled the different screw configurations to the fracture model separately to form the fixation models. After meshing the models’ elements, we used Abaqus software to perform the finite element analysis. Parameters of von Mises stress distribution on the screws, peak stress, displacement between fracture fragments, and model principal strains in cancellous bone were reported.

Results

Our results indicated that the peak von Mises stresses of screws was concentrated in the middle surface of the screw near the fracture line in each group. Peak stress value of the implants was highest in the model of triangle with posterior single screw. And the lowest stress values were observed in the triangular model. Fully threaded screw in each group underwent the most stress while partially threaded screw underwent a little bit of stress. Lowest displacement was observed in the triangular model. The volume of bone susceptible to yielding in the femoral neck region was the lowest for triangular configuration.

Conclusions

For unstable femoral neck fractures, superior results were obtained by stabilizing the fracture with triangular configuration formed by one superior partially threaded screw and two inferior fully threaded screws. This study will require clinical confirmation as to its practicality in the management of unstable femoral fractures.
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Metadata
Title
Finite element analysis of different configurations of fully threaded cannulated screw in the treatment of unstable femoral neck fractures
Authors
Jiantao Li
Menglin Wang
Lianting Li
Hao Zhang
Ming Hao
Chen Li
Lin Han
Jianfeng Zhou
Kun Wang
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of Orthopaedic Surgery and Research / Issue 1/2018
Electronic ISSN: 1749-799X
DOI
https://doi.org/10.1186/s13018-018-0970-3

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