The Open Orthopaedics Journal




ISSN: 1874-3250 ― Volume 13, 2019
RESEARCH ARTICLE

Biomechanical Analysis of the Fixation Strength of a Novel Plate for Greater Tuberosity Fractures



Aristotelis Kaisidis1, Panagiotis G. Pantos1, *, Dimitrios Bochlos1, Horst Lindner2
1 Shoulder Department, Klinik Maingau, Rotes Kreuz, Frankfurt am Main, Germany
2 Königsee Implantate GmbH, Aschau, Germany

Abstract

Background:

The incidence of isolated greater tuberosity fractures has been estimated to be 20% of all proximal humeral fractures. It is generally accepted that displaced (>5 mm) fractures should be treated surgically but the optimal surgical fixation of greater tuberosity fractures remains unclear.

Objective:

The goal of this study was to simulate the environment of application of a new plate system (Kaisidis plate, Fa Königsee) for fractures of greater tuberosity, and to demonstrate the stability of the plate.

Methods:

A Finite Element Method (FEM) simulation analysis was performed on a Kaisidis plate fixed with nine screws, in a greater tuberosity fracture model. Solid Works 2015 simulation software was used for the analysis. The Kaisidis plate is a bone plate intended for greater tuberosity fractures. It is a low profile plate with nine holes for 2,4 mm diameter locking screws, eight suture holes and additional K-wire holes for temporary fixation of the fragment.

The supraspinatus tendon has the greatest effect on the fracture zone, and as such, was the primary focus for this study. For this study, we performed only linear calculations.

Results:

The calculations were performed in a way so that the total applied force resulted in a maximum stress of 816 N/mm2. The findings indicated that the most critical points of the Kaisidis system are the screws that are connected to the bone. The maximal force generated by the supraspinatus tendon was 784 N, which is higher than the minimal acceptable force.

The results of the FEM analysis showed that the maximal supraspinatus force was 11.6% higher than the minimal acceptable force. As such, the load would exceed twice the amount of maximal force required to tear the supraspinatus tendon, before the screw or the plate would show first signs of plastic deformation.

Conclusion:

Based on the results of this analysis and the fulfilment of our acceptance criterion, the FEM model indicated that the strength of the Kaisidis plate exceeded that of the proposed maximum loads under non-cycli loading conditions.

Keywords: Biomechanical analysis, Greater tuberosity fractures, Kaisidis plate, Supraspinatus tendon, Solidworks 2015, Finite Element Method.


Article Information


Identifiers and Pagination:

Year: 2018
Volume: 12
First Page: 218
Last Page: 228
Publisher Id: TOORTHJ-12-218
DOI: 10.2174/1874325001812010218

Article History:

Received Date: 25/03/2018
Revision Received Date: 08/06/2018
Acceptance Date: 8/6/2018
Electronic publication date: 29/06/2018
Collection year: 2018

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© 2018 Kaisidis et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Shoulder Department, Klinik Maingau, Rotes Kreuz, Schoeffelstrasse 2-14, 60318, Frankfurt am Main, Germany; Tel: +49694033890; Fax: +494033892; E-mail: ppados@yahoo.com



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