Finite Element and Experimental Investigation of Human Femur Cortical Bone Microdamage during Radial Fretting

2012 ◽  
Vol 486 ◽  
pp. 313-320
Author(s):  
Juan Liu ◽  
Huo Ming Shen ◽  
Yi Ren Yang ◽  
Zhen Bing Cai
Keyword(s):  
Cortical Bone ◽  
Load Condition ◽  
Fem Analysis ◽  
Surface Damage ◽  
Compact Bone ◽  
Bone Fragility ◽  
Haversian Canal ◽  
Modeling And Analysis ◽  
Human Femur ◽  
Bone Microdamage

Accumulation of microdamage can result in increased bone fragility and osteoporotic fracture in human bone.Microcracks in bone have been implicated in the development of stress fractures.The goal of this study was to investigate the human femur cortical bone microdamage during radial fretting and its stress and strain distribution. Modeling and analysis were taken for Haversian system using FEM soft. Analytical results indicated that stress concentration which occurred in the haversian canal and around circumferential lamellas and through the circumferential lamellas and the interstitial tissues could lead to microcrack initiation of multi-areas. In addition, microcrack could occur as a result of a rather large plastic area which crossed interstitial bone and connected adjacent osteon under high load condition. In the meantime, radial fretting behaviors of the fresh human axial femur compact bone were investigated under a flat-on-ball configuration in high accuracy hydraulic servo fretting experimental machine. The kinetics behaviors of the compact bone were revealed by the F-D curves. The surface damage was analyzed combined with the examinations by laser confocal scanning microscopy (LCSM) and scanning electron microscopy (SEM) . The morphologies showed that the microcracks were the primary damage form.The results showed that three typical types of cracks-radial microcrackannular microcrack and linking microcrack were observed. The test results and the FEM analysis results were of good consistency, and brought forth that most of microcracks run between the surrounding interstitial bone and the cement line.

Radial fretting damage behavior of human femur cortical bone and fem analysis

2008 ◽  
Vol 136 ◽  
pp. S410
Author(s):  
Zhenbing Cai ◽  
Minhao Zhu ◽  
Haiyang Yu ◽  
Huoming Shen ◽  
Qian Huang ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Fem Analysis ◽  
Damage Behavior ◽  
Human Femur ◽  
Fretting Damage

Mechanical Anisotropy of Individual Osteons in Bone Tissue at High Spatial Resolutions

2009 ◽  
Author(s):  
Davide Carnelli ◽  
Haimin Yao ◽  
Ming Dao ◽  
Pasquale Vena ◽  
Roberto Contro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cortical Bone ◽  
Mechanical Anisotropy ◽  
Haversian Canal ◽  
Maximum Penetration ◽  
Fundamental Units ◽  
Anisotropy Of Mechanical Properties ◽  
Penetration Depths ◽  
Secondary Osteons ◽  
Mineralized Collagen

Secondary osteons, the fundamental units of cortical bone, consist of cylindrical lamellar composites composed of mineralized collagen fibrils. Due to its lamellar structure, a multiscale knowledge of the mechanical properties of cortical bone is required to understand the biomechanical function of the tissue. In this light, nanoindentation tests were performed along the axial and transverse directions following a radial path from the Haversian canal to the osteonal edges. Different length scales are explored by means of indentations at different maximum penetration depths. Indentation moduli and hardness data were then interpreted in the context of the known microstructure. Results suggest that secondary osteons hierarchical structure is responsible for an observed length scale effect, homogenization phenomena and anisotropy of mechanical properties.

scholarly journals Fracture process in cortical bone: X-FEM analysis of microstructured models

2014 ◽  
pp. 43-55
Author(s):  
Simin Li ◽  
Adel Abdel-Wahab ◽  
Emrah Demirci ◽  
Vadim V. Silberschmidt
Keyword(s):  
Cortical Bone ◽  
Fracture Process ◽  
Fem Analysis

scholarly journals In Vivo Assessment of Cortical Bone Fragility

2020 ◽  
Vol 18 (1) ◽  
pp. 13-22
Author(s):  
Lyn Bowman ◽  
Anne B. Loucks
Keyword(s):  
Cortical Bone ◽  
Bone Fragility ◽  
In Vivo Assessment

scholarly journals FEM analysis of a new miniplate: stress distribution on the plate, screws and the bone

2012 ◽  
Vol 06 (01) ◽  
pp. 009-015 ◽  
Author(s):  
Didem Nalbantgil ◽  
Murat Tozlu ◽  
Fulya Ozdemir ◽  
Mehmet Oguz Oztoprak ◽  
Tulin Arun
Keyword(s):  
Finite Element ◽  
Cortical Bone ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Force Distribution ◽  
Bone Surface ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

ABSTRACTObjectives: Non-homogeneous force distribution along the miniplates and the screws is an unsolved question for skeletal anchorage in orthodontics. To overcome this issue, a miniplate structure was designed featuring spikes placed on the surface facing the cortical bone. The aim of this study was to examine and compare the force distribution of the newly designed plate-screw systems with the conventional one.Methods: A model of bone surface with 1.5 mm cortical thickness, along with the two newly designed miniplates and a standard miniplate-screw were simulated on the three-dimensional model. 200 g experimental force was applied to the tip of the miniplates and the consequential effects on the screws and cortical bone was evaluated using three-dimensional finite element method.Results: As a result of this finite element study, remarkably lower stresses were observed on the screws and the cortical bone around the screws with the newly designed miniplate when compared with the conventional one.Conclusion: The newly designed miniplate that has spikes was found effective in reducing the stress on and around the screws and the force was distributed more equivalently. (Eur J Dent 2012;6:9-15)

scholarly journals Histomorphometric variance of haversian canal in cortical bone of Malaysian ethnic groups

2018 ◽  
Vol 1019 ◽  
pp. 012009
Author(s):  
Hadi Abdullah ◽  
Muhammad Mahadi Abdul Jamil ◽  
Faridah Mohd Nor
Keyword(s):  
Cortical Bone ◽  
Ethnic Groups ◽  
Haversian Canal

scholarly journals 3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hemanth Tumkur Lakshmikantha ◽  
Naresh Kumar Ravichandran ◽  
Mansik Jeon ◽  
Jeehyun Kim ◽  
Hyo-Sang Park
Keyword(s):  
Optical Coherence Tomography ◽  
Cortical Bone ◽  
Optical Coherence ◽  
3 Dimensional ◽  
Bone Microdamage

scholarly journals Orientation and size-dependent mechanical modulation within individual secondary osteons in cortical bone tissue

2013 ◽  
Vol 10 (81) ◽  
pp. 20120953 ◽  
Author(s):  
Davide Carnelli ◽  
Pasquale Vena ◽  
Ming Dao ◽  
Christine Ortiz ◽  
Roberto Contro
Keyword(s):  
Mechanical Properties ◽  
Cortical Bone ◽  
Mechanical Behaviour ◽  
Long Bone ◽  
Periodic Pattern ◽  
Haversian Canal ◽  
Length Scale ◽  
Lamellar Bone ◽  
Mechanical Modulation ◽  
Secondary Osteons

Anisotropy is one of the most peculiar aspects of cortical bone mechanics; however, its anisotropic mechanical behaviour should be treated only with strict relationship to the length scale of investigation. In this study, we focus on quantifying the orientation and size dependence of the spatial mechanical modulation in individual secondary osteons of bovine cortical bone using nanoindentation. Tests were performed on the same osteonal structure in the axial (along the long bone axis) and transverse (normal to the long bone axis) directions along arrays going radially out from the Haversian canal at four different maximum depths on three secondary osteons. Results clearly show a periodic pattern of stiffness with spatial distance across the osteon. The effect of length scale on lamellar bone anisotropy and the critical length at which homogenization of the mechanical properties occurs were determined. Further, a laminate-composite-based analytical model was applied to the stiffness trends obtained at the highest spatial resolution to evaluate the elastic constants for a sub-layer of mineralized collagen fibrils within an osteonal lamella on the basis of the spatial arrangement of the fibrils. The hierarchical arrangement of lamellar bone is found to be a major determinant for modulation of mechanical properties and anisotropic mechanical behaviour of the tissue.

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