A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study

Previous studies have been done on the performance of different screw designs and configurations. These are based on the pull-out strength of the screws and the best fixation based on load, stiffness and displacement characteristic. However, there is not much study done on the use of finite element...

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Main Author: Lee, Guo Xiang
Other Authors: Chou Siaw Meng
Format: Final Year Project
Language:English
Published: 2016
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Online Access:http://hdl.handle.net/10356/68227
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-682272023-03-04T19:04:58Z A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study Lee, Guo Xiang Chou Siaw Meng School of Mechanical and Aerospace Engineering DRNTU::Engineering Previous studies have been done on the performance of different screw designs and configurations. These are based on the pull-out strength of the screws and the best fixation based on load, stiffness and displacement characteristic. However, there is not much study done on the use of finite element method to investigate the various fixations. In this study, Abaqus was used to compare the results between cannulated screws and non-cannulated screws used in an inferior triangular fixation on Pauwel’s type-2 vertical femoral neck fracture. The model was modelled after a Sawbone femur. Loading of 2000 N were used. The von Mises stresses were analysed and compared with the yield stress. The cortical bone of the cannulated screw fixation stress value is 154.2 MPa while the cortical bone of the non-cannulated screw fixation stress value is 136.8 MPa. The cannulated screw stress value is 1593 MPa while the non-cannulated screw stress value is 1746 MPa. This results suggest that the non-cannulated screws are able to withstand a greater load than cannulated screws. However, the results obtained were unrealistic comparing with the yield stresses. As such, lower loading of 650 N and 1000 N were used to run the simulations. The maximum von Mises stress values for cortical bone, cannulated screws and non-cannulated screws increased with increased loading other than the third cannulated screw which stress value decreases when loading increased from 1000 N to 2000 N. It is likely the screw had failed and this causes a load shift. Bachelor of Engineering (Mechanical Engineering) 2016-05-25T02:21:49Z 2016-05-25T02:21:49Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/68227 en Nanyang Technological University 110 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
Lee, Guo Xiang
A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
description Previous studies have been done on the performance of different screw designs and configurations. These are based on the pull-out strength of the screws and the best fixation based on load, stiffness and displacement characteristic. However, there is not much study done on the use of finite element method to investigate the various fixations. In this study, Abaqus was used to compare the results between cannulated screws and non-cannulated screws used in an inferior triangular fixation on Pauwel’s type-2 vertical femoral neck fracture. The model was modelled after a Sawbone femur. Loading of 2000 N were used. The von Mises stresses were analysed and compared with the yield stress. The cortical bone of the cannulated screw fixation stress value is 154.2 MPa while the cortical bone of the non-cannulated screw fixation stress value is 136.8 MPa. The cannulated screw stress value is 1593 MPa while the non-cannulated screw stress value is 1746 MPa. This results suggest that the non-cannulated screws are able to withstand a greater load than cannulated screws. However, the results obtained were unrealistic comparing with the yield stresses. As such, lower loading of 650 N and 1000 N were used to run the simulations. The maximum von Mises stress values for cortical bone, cannulated screws and non-cannulated screws increased with increased loading other than the third cannulated screw which stress value decreases when loading increased from 1000 N to 2000 N. It is likely the screw had failed and this causes a load shift.
author2 Chou Siaw Meng
author_facet Chou Siaw Meng
Lee, Guo Xiang
format Final Year Project
author Lee, Guo Xiang
author_sort Lee, Guo Xiang
title A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
title_short A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
title_full A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
title_fullStr A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
title_full_unstemmed A comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
title_sort comparison between cannulated and non-cannulated cancellous screws used in the fixation of a simulated femoral neck fracture - a finite element study
publishDate 2016
url http://hdl.handle.net/10356/68227
_version_ 1759853867479072768