Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model

Intertrochanteric femoral fractures are serious traumas among elderly patients. In these patients, external fixator is a preferable method for the fixation of fractures. Therefore, this study was planned to compare the parallel and convergent proximal schanz screw placement of pertrochanteric fi...

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Main Authors: A. Gok, S. Inal, F. Taspinar, E. Gulbandilar, K. Gok
Format: Article
Language:English
Published: Copernicus Publications 2017-08-01
Series:Mechanical Sciences
Online Access:https://www.mech-sci.net/8/259/2017/ms-8-259-2017.pdf
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spelling doaj-6fa6b3e5fba44c9a92bbfd484b2ca4f62020-11-24T21:18:17ZengCopernicus PublicationsMechanical Sciences2191-91512191-916X2017-08-01825926610.5194/ms-8-259-2017Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture modelA. Gok0S. Inal1F. Taspinar2E. Gulbandilar3K. Gok4Amasya University, Technology Faculty, Mechanical Engineering, 05000 Amasya, TurkeyDumlupinar University, School of Medicine, Department of Orthopaedics and Traumatology, Campus of Evliya Celebi, 43100 Kutahya, TurkeyDumlupinar University, School of Health Science, Department of Physiotherapy and Rehabilitation, 43100 Kutahya, TurkeyEskisehir Osmangazi University, Faculty of Engineering & Architecture, Department of Computer Engineering, Meselik Campus, 26480 Eskisehir, TurkeyManisa Celal Bayar University, Hasan Ferdi Turgutlu Teknoloji Fakültesi, Mechanical and Manufacturing Engineering, 45400 Manisa, TurkeyIntertrochanteric femoral fractures are serious traumas among elderly patients. In these patients, external fixator is a preferable method for the fixation of fractures. Therefore, this study was planned to compare the parallel and convergent proximal schanz screw placement of pertrochanteric fixator in the intertrochanteric femoral fractures with respect to biomechanical forces that stabilize the fracture line and to present their clinical importance. A commercial finite element based program, AnsysWorkbench was used to investigate the biomechanical parameters of the femoral intertrochanteric fractures and different placement of implants. The von Mises stress, von Mises strain and shear stress on the proximal and distal surface of the fracture line were lower in the convergent pertrochanteric fixator. Proximal schanz screws in convergent configuration pertrochanteric fixator had greater stress and strain values than proximal schanz screws in parallel configuration pertrochanteric fixator. The distance between the proximal schanz screws on the fracture line was measured as 12 mm in convergent configuration pertrochanteric fixator, and as 3.5 mm in parallel configuration pertrochanteric fixator. The angle between the proximal schanz screws in the convergent configuration was measured as 12.88°. The effect of convergent and parallel configuration pertrochanteric fixators on axial loading demonstrated that convergent configuration pertrochanteric fixator was safer in this respect.https://www.mech-sci.net/8/259/2017/ms-8-259-2017.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. Gok
S. Inal
F. Taspinar
E. Gulbandilar
K. Gok
spellingShingle A. Gok
S. Inal
F. Taspinar
E. Gulbandilar
K. Gok
Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
Mechanical Sciences
author_facet A. Gok
S. Inal
F. Taspinar
E. Gulbandilar
K. Gok
author_sort A. Gok
title Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
title_short Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
title_full Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
title_fullStr Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
title_full_unstemmed Comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
title_sort comparison of parallel or convergent proximal schanz screw placement of pertrochanteric fixator in intertrochanteric fracture model
publisher Copernicus Publications
series Mechanical Sciences
issn 2191-9151
2191-916X
publishDate 2017-08-01
description Intertrochanteric femoral fractures are serious traumas among elderly patients. In these patients, external fixator is a preferable method for the fixation of fractures. Therefore, this study was planned to compare the parallel and convergent proximal schanz screw placement of pertrochanteric fixator in the intertrochanteric femoral fractures with respect to biomechanical forces that stabilize the fracture line and to present their clinical importance. A commercial finite element based program, AnsysWorkbench was used to investigate the biomechanical parameters of the femoral intertrochanteric fractures and different placement of implants. The von Mises stress, von Mises strain and shear stress on the proximal and distal surface of the fracture line were lower in the convergent pertrochanteric fixator. Proximal schanz screws in convergent configuration pertrochanteric fixator had greater stress and strain values than proximal schanz screws in parallel configuration pertrochanteric fixator. The distance between the proximal schanz screws on the fracture line was measured as 12 mm in convergent configuration pertrochanteric fixator, and as 3.5 mm in parallel configuration pertrochanteric fixator. The angle between the proximal schanz screws in the convergent configuration was measured as 12.88°. The effect of convergent and parallel configuration pertrochanteric fixators on axial loading demonstrated that convergent configuration pertrochanteric fixator was safer in this respect.
url https://www.mech-sci.net/8/259/2017/ms-8-259-2017.pdf
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