Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"osteons"”.
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Regression Analysis of Fracture Toughness for Secondary Osteons Located in Human Cortical Bone
… region, porosity, volume fraction of lightfield osteons, volume fraction of hooped osteons, volume fraction of dark osteons, volume fraction of alternating osteons, volume fraction total, density, average diameter total, average diameter of hooped osteons, average diameter of lightfield osteons, …
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The use of histological examination methods to distinguish between the burnt remains of human and non-human bones
… across species and temperature. A total of 523 osteons in unburned bone and 147 in the burned bone samples were analysed. ANOVA testing found overall significance (p < 0.0001) for all parameters measured, which suggests that temperature does affect the size of microstructures. Most parameter …
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An experimental investigation, into the effects of thermal alteration on microstructures in mammalian long bones.
… commonly used method involves counting intact osteons and measuring their diameter. The current project presents the results of experiments in which animal proxies for human remains were subject to varying conditions of burning; the intention of which was to establish the extent of changes …
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Multiscale characterization of mechanical and fracture properties of cortical bone specimens
… lamellar structure at the microscale, osteons at the mesoscale to a whole bone at the macroscale. Several fracture testing methods are available including the three-point bending test, the compact tension test and the double cantilever test. However, these methods are confined to the …
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Microstructural and Mechanical Properties of Human Ribs
The direction of osteons in cortical bone has been shown to be well correlated with the strongest loading direction of the bone as a whole. Therefore, determining the orientation of osteons in the rib cage is an important step in understanding the behavior of the rib cage under mechanical load. A …
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Effects of Ovariectomy and Anatomical Position on the Compact Bone As Seen in Three Month Summer Ovine Model
… line per square mm of bone tissue and material, osteons per field, and the mean osteon area. Densitometry analysis was also performed using the microradiographs using image analysis and the use of an aluminum step wedge on each microradiograph as a key. Once all of the data was collected a 2-way …
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Multi-scale characterization of swine femoral cortical bone and long bone defect repair by regeneration
… (1–10 cm, involving a random arrangement of osteons, lamellar bone and/or woven bone, representing cortical bone). Macroscale level represents a whole bone level which includes both cortical and trabecular bones. Samples prepared from swine femoral cortical bones from three age groups …
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Characterization of swine femoral cortical bone using the reference point indentation technique
… month bone samples, while comparable amounts of osteons are observed in 6, 14.5, and 24 month age groups. We conclude that by inducing microcracks onto the bone surface, the RPI technique can provide useful information about fracture properties of cortical bone.
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A New Quantitative Method for the Taxonomic Identification of Tetrapods
… of primary vasculature, secondary osteons, Haversian canals, primary lacunae, and secondary lacunae. No single microstructure or measurement is sufficient to account for taxonomic variation. Rather, size, shape, and orientation of various microstructural features, in combination, …
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Non-invasive characterization of bone tissue and modeling of bone at micron and sub-micron levels
… response. At micron level, bone consists of osteons and interstitial lamella which are made of lamellae. We propose using classical laminate theory, namely Sun & Li’s three dimensional laminate model to model bone at micron level. The outputs are compared with nanoindentation results, …
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Comparison of the long bone microstructure of two southern African marine birds, the Cape gannet (Morus capensis) and the African penguin (Spheniscus demersus) with respect to their aquatic adaptations
… bones are thin walled, less compact with primary osteons dominating the mid-cortex, and a large vacant medullary cavity is present. The gannet fore- and hind limb bones do not differ in terms of bone compactness. Ontogenetic differences in the penguin long bones show that the hatchling bears an …
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Early Osteoarthritis: A multi-scale structural and mechanical investigation
… spicules resemble the structure of developing osteons in bone remodelling and become more bony and less vascular with disease progression. However, their frequency and morphology do not otherwise change with early degeneration. This thesis provides, for the first time, a deeper understanding of …
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Simulations of deformations and fracture of biological materials
… is represented by several randomly arranged osteons. The accuracy of results is investigated by comparing a linear elastic fracture mechanics approach with a cohesive segment approach and varying the finite element model mesh density, element type, damage evolution, and boundary conditions. …
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Functional anatomy, osteogenesis and bone microstructure of the appendicular system of African mole-rats (Rodentia: Ctenohystrica: Bathyergidae)
… remodeling (i.e. development of secondary osteons) and they do not ever develop Haversian bone tissues. This thesis concludes that the combination of social strategy and type of excavation had an impact on the evolution of the bathyergid appendicular system. On one hand, it was evidenced …
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Investigation of age related changes to porcine cortical bone using nanoindentation and ash content
This thesis focuses on the characterization of porcine cortical bone during its development stage. The goal of this research is to gain a further understanding of cortical bone, and to obtain data that can be used for inputs and validation of a computational model of cortical bone and individual …