Stress analysis of femur and femoral stems for hip arthroplasty

Osteoarthritis is the major reason that causes hip problem. According to Cristofolini (1997), there are more than 800,000 hip replacements being implanted worldwide annually. It is important to know the performance of hip prostheses especially the stability and the longevity. In this project, numeri...

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Main Author:	Wong, King Jye
Format:	Thesis
Language:	English
Published:	2006
Subjects:	RZ Other systems of medicine
Online Access:	http://eprints.utm.my/id/eprint/9673/1/WongKingJyeMFKM2006.pdf
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id	my-utm-ep.9673
record_format	uketd_dc
spelling	my-utm-ep.96732018-09-17T03:35:46Z Stress analysis of femur and femoral stems for hip arthroplasty 2006-05 Wong, King Jye RZ Other systems of medicine Osteoarthritis is the major reason that causes hip problem. According to Cristofolini (1997), there are more than 800,000 hip replacements being implanted worldwide annually. It is important to know the performance of hip prostheses especially the stability and the longevity. In this project, numerical simulation based on finite element method is used to analyze the mechanical behavior of femur-implant system. Finite element analysis is carried out on three-dimensional model of a human femur on both full and half models. This is to investigate the behavior of an intact femur under loading. Then, the analysis is repeated for an Anatomic Medullary Locking (AML) hip prosthesis, which is of one type of cementless hip prosthesis, implanted inside the femur. This is only done on half femur model. Both the stem and the head are made by Cobalt Chromium Molybdenum (CoCrMo). After that, the analysis is carried out on a cemented hip prosthesis. The cement is made by polymethylmethacrylate (PMMA), which is of flexible polymeric cement. The hip prosthesis model used for analysis is of Charnley type. The study on the stem length effect is then done. Lastly, the analysis is repeated for cancellous with different density. The cortical, cancellous, metal and cement are assumed to be linear, elastic, isotropic and homogeneous. Linear elastic analysis is adapted and maximum principal stress/strain and von Mises stress are the criterions that are of concern. Results show that both full and half femur modeling give similar stress distribution. Besides, the treated femur is always understressed at the upper most region of the femur. Cemented type of total hip replacement (THR) gives a better stress distribution on the femur compared to cementless type. In addition, hip prosthesis with shorter stem induces the stresses more evenly on the femur. Also, different cancellous density does not significantly affect the stresses. 2006-05 Thesis http://eprints.utm.my/id/eprint/9673/ http://eprints.utm.my/id/eprint/9673/1/WongKingJyeMFKM2006.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:54837 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	RZ Other systems of medicine
spellingShingle	RZ Other systems of medicine Wong, King Jye Stress analysis of femur and femoral stems for hip arthroplasty
description	Osteoarthritis is the major reason that causes hip problem. According to Cristofolini (1997), there are more than 800,000 hip replacements being implanted worldwide annually. It is important to know the performance of hip prostheses especially the stability and the longevity. In this project, numerical simulation based on finite element method is used to analyze the mechanical behavior of femur-implant system. Finite element analysis is carried out on three-dimensional model of a human femur on both full and half models. This is to investigate the behavior of an intact femur under loading. Then, the analysis is repeated for an Anatomic Medullary Locking (AML) hip prosthesis, which is of one type of cementless hip prosthesis, implanted inside the femur. This is only done on half femur model. Both the stem and the head are made by Cobalt Chromium Molybdenum (CoCrMo). After that, the analysis is carried out on a cemented hip prosthesis. The cement is made by polymethylmethacrylate (PMMA), which is of flexible polymeric cement. The hip prosthesis model used for analysis is of Charnley type. The study on the stem length effect is then done. Lastly, the analysis is repeated for cancellous with different density. The cortical, cancellous, metal and cement are assumed to be linear, elastic, isotropic and homogeneous. Linear elastic analysis is adapted and maximum principal stress/strain and von Mises stress are the criterions that are of concern. Results show that both full and half femur modeling give similar stress distribution. Besides, the treated femur is always understressed at the upper most region of the femur. Cemented type of total hip replacement (THR) gives a better stress distribution on the femur compared to cementless type. In addition, hip prosthesis with shorter stem induces the stresses more evenly on the femur. Also, different cancellous density does not significantly affect the stresses.
format	Thesis
qualification_level	Master's degree
author	Wong, King Jye
author_facet	Wong, King Jye
author_sort	Wong, King Jye
title	Stress analysis of femur and femoral stems for hip arthroplasty
title_short	Stress analysis of femur and femoral stems for hip arthroplasty
title_full	Stress analysis of femur and femoral stems for hip arthroplasty
title_fullStr	Stress analysis of femur and femoral stems for hip arthroplasty
title_full_unstemmed	Stress analysis of femur and femoral stems for hip arthroplasty
title_sort	stress analysis of femur and femoral stems for hip arthroplasty
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2006
url	http://eprints.utm.my/id/eprint/9673/1/WongKingJyeMFKM2006.pdf
_version_	1747814773965193216

Stress analysis of femur and femoral stems for hip arthroplasty

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