Bone as a composite material: The role of osteons as barriers to crack growth in compact bone

This article summarises a number of studies in the area of bone microdamage which were carried out in our laboratory over the past 5 years. A technique was developed to label microcracks during mechanical testing. Fluorescent chelating agents were applied at intervals to bone specimens fatigue teste...

Full description

Saved in:
Bibliographic Details
Published in:International journal of fatigue 2007-06, Vol.29 (6), p.1051-1056
Main Authors: O’Brien, Fergal J., Taylor, David, Clive Lee, T.
Format: Article
Language:English
Subjects:
Applied sciences
Bone
Exact sciences and technology
Fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microcrack
Propagation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This article summarises a number of studies in the area of bone microdamage which were carried out in our laboratory over the past 5 years. A technique was developed to label microcracks during mechanical testing. Fluorescent chelating agents were applied at intervals to bone specimens fatigue tested in cyclic compression until failure occurred. Microcrack densities were measured and microcrack length at the time of encountering the cement line surrounding an osteon was also recorded. Microcracks were shown to develop rapidly during the first stage of testing but then further accumulation of cracks did not occur until the period just before failure. The majority of microcracks were found in interstitial bone and did not penetrate cement lines. Only microcracks greater than 300 μm in length were found to be capable of penetrating osteons. This work provides experimental data to support the hypothesis that secondary osteons act as barriers to crack propagation in compact bone.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2006.09.017