- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Faculty Research and Publications /
- Sub-Lamellar Microcracking and Roles of Canaliculi...
Open Collections
UBC Faculty Research and Publications
Sub-Lamellar Microcracking and Roles of Canaliculi in Human Cortical Bone Ebacher, Vincent; Guy, Pierre; Oxland, Thomas R.; Wang, Rizhi
Abstract
Bone is a tough biological material. It is generally accepted that bone’s toughness arises from its unique hierarchical structure, which in turn facilitates distributed microcracking prior to fracture. Yet, there has been limited progress on the detailed roles of the structural elements in the microcracking process. The present study examines the structure - microcracking relations at the lamellar and sub-lamellar levels of human cortical bone subjected to compressive loading. Laser scanning confocal microscopy revealed a clear influence of the local structure and porosity of the Haversian systems’ lamellae on microcrack development. In particular, crack initiation and growth under transverse compression were associated with stress concentration at canaliculi. Later stages of microcracking showed extensive sub-lamellar cracks forming cross-hatched patterns and regularly spaced 0.5 to 1.7 μm apart. The density, size and regularity of the crack patterns suggest enhanced inelastic deformation capacity through cracking control at the level of mineralized collagen fibril bundles. The present study thus improves the current understanding of the nature of inelastic deformation and microcracking in bone and further suggests that bone’s resistance to fracture is achieved through microcrack control at multiple length scales.
Item Metadata
Title |
Sub-Lamellar Microcracking and Roles of Canaliculi in Human Cortical Bone
|
Creator | |
Date Issued |
2012
|
Description |
Bone is a tough biological material. It is generally accepted that bone’s toughness arises from its
unique hierarchical structure, which in turn facilitates distributed microcracking prior to fracture.
Yet, there has been limited progress on the detailed roles of the structural elements in the
microcracking process. The present study examines the structure - microcracking relations at the
lamellar and sub-lamellar levels of human cortical bone subjected to compressive loading. Laser
scanning confocal microscopy revealed a clear influence of the local structure and porosity of the
Haversian systems’ lamellae on microcrack development. In particular, crack initiation and
growth under transverse compression were associated with stress concentration at canaliculi.
Later stages of microcracking showed extensive sub-lamellar cracks forming cross-hatched
patterns and regularly spaced 0.5 to 1.7 μm apart. The density, size and regularity of the crack
patterns suggest enhanced inelastic deformation capacity through cracking control at the level of
mineralized collagen fibril bundles. The present study thus improves the current understanding
of the nature of inelastic deformation and microcracking in bone and further suggests that bone’s
resistance to fracture is achieved through microcrack control at multiple length scales.
|
Subject | |
Genre | |
Type | |
Language |
eng
|
Date Available |
2016-10-08
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
|
DOI |
10.14288/1.0319071
|
URI | |
Affiliation | |
Citation |
Sub-Lamellar Microcracking and the Roles of the Canalicular Network in Human Haversian Bone. by Vincent Ebacher, Pierre Guy, Thomas R. Oxland, Rizhi Wang, Acta Biomaterialia, 8 (2012) 1093-1100.
|
Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty; Graduate
|
Copyright Holder |
Elsevier
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International