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Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis

Total hip replacement (THR) is considered the most successful orthopedics surgery but eventually there is flaw rise from the effect of post-surgery itself which is stress shielding. Nature behavior of bone is considered a complex biological material due to its heterogeneous and anisotropic propertie...

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Main Author: Mohamad, Faiz
Format: Monograph
Language:English
Published: Universiti Sains Malaysia 2017
Subjects:
T Technology
TJ Mechanical engineering and machinery
Online Access:http://eprints.usm.my/53701/1/Evaluation%20Of%20Load-Transfer%20Pattern%20In%20Implanted%20Femur%20By%20Patient-Specific%20Fe%20Analysis_Faiz%20Mohamad_M4_2017.pdf
http://eprints.usm.my/53701/
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spelling my.usm.eprints.53701 http://eprints.usm.my/53701/ Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis Mohamad, Faiz T Technology TJ Mechanical engineering and machinery Total hip replacement (THR) is considered the most successful orthopedics surgery but eventually there is flaw rise from the effect of post-surgery itself which is stress shielding. Nature behavior of bone is considered a complex biological material due to its heterogeneous and anisotropic properties. The differences in stiffness between bone and the implant which is one of the main factor of occurring shielding stress. Stress shielding occurred in structures combining stiff with more flexible, in which results in bone loss and cortical thinning which lead to joint prosthesis failure. This research aims to explores the shielding stress would become severe when different types of orthopedic implant materials is used in THR. Therefore, 3-D bone model was developed based on CT-data scan by patient-specific and isotropic with heterogeneous material properties was assigned to the femur, whereby Ti-6Al-4V and Co-Cr-Mo were chosen as standard orthopedic implant materials. The maximum load generated during one complete gait cycles in normal walking and climbing upstairs were chosen for FE analysis. The principle elastic strain along the femur, both in intact and implanted femur conditions, were investigated based on Gruen mapping zone. Results show that maximum tension favors on the lateral side at region 4 and maximum compression mostly tends to occur on medial side at region 3 and 4. For both type of activities, there are percentage difference in strain value between femur and implanted femur, where differences is higher in CoCr-alloy implants rather than Ti-alloy implant. The large percentage difference between intact and implanted femur indicates that that gap strain value is high, and this is merely due to effect of stiffness used in implants that eventually shielded the stress from distribute along the femur, which can lead to implant loosening and prosthetic failure. Universiti Sains Malaysia 2017-06-01 Monograph NonPeerReviewed application/pdf en http://eprints.usm.my/53701/1/Evaluation%20Of%20Load-Transfer%20Pattern%20In%20Implanted%20Femur%20By%20Patient-Specific%20Fe%20Analysis_Faiz%20Mohamad_M4_2017.pdf Mohamad, Faiz (2017) Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis. Project Report. Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Mekanik. (Submitted)
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic T Technology
TJ Mechanical engineering and machinery
spellingShingle T Technology
TJ Mechanical engineering and machinery
Mohamad, Faiz
Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
description Total hip replacement (THR) is considered the most successful orthopedics surgery but eventually there is flaw rise from the effect of post-surgery itself which is stress shielding. Nature behavior of bone is considered a complex biological material due to its heterogeneous and anisotropic properties. The differences in stiffness between bone and the implant which is one of the main factor of occurring shielding stress. Stress shielding occurred in structures combining stiff with more flexible, in which results in bone loss and cortical thinning which lead to joint prosthesis failure. This research aims to explores the shielding stress would become severe when different types of orthopedic implant materials is used in THR. Therefore, 3-D bone model was developed based on CT-data scan by patient-specific and isotropic with heterogeneous material properties was assigned to the femur, whereby Ti-6Al-4V and Co-Cr-Mo were chosen as standard orthopedic implant materials. The maximum load generated during one complete gait cycles in normal walking and climbing upstairs were chosen for FE analysis. The principle elastic strain along the femur, both in intact and implanted femur conditions, were investigated based on Gruen mapping zone. Results show that maximum tension favors on the lateral side at region 4 and maximum compression mostly tends to occur on medial side at region 3 and 4. For both type of activities, there are percentage difference in strain value between femur and implanted femur, where differences is higher in CoCr-alloy implants rather than Ti-alloy implant. The large percentage difference between intact and implanted femur indicates that that gap strain value is high, and this is merely due to effect of stiffness used in implants that eventually shielded the stress from distribute along the femur, which can lead to implant loosening and prosthetic failure.
format Monograph
author Mohamad, Faiz
author_facet Mohamad, Faiz
author_sort Mohamad, Faiz
title Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
title_short Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
title_full Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
title_fullStr Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
title_full_unstemmed Evaluation Of Load-Transfer Pattern In Implanted Femur By Patient-Specific Fe Analysis
title_sort evaluation of load-transfer pattern in implanted femur by patient-specific fe analysis
publisher Universiti Sains Malaysia
publishDate 2017
url http://eprints.usm.my/53701/1/Evaluation%20Of%20Load-Transfer%20Pattern%20In%20Implanted%20Femur%20By%20Patient-Specific%20Fe%20Analysis_Faiz%20Mohamad_M4_2017.pdf
http://eprints.usm.my/53701/
_version_ 1739829015030530048
score 13.211869

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