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 16 of 16 for “"Osteon"”.
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An Exploration of Histological Variation in the Human Rib: Applications for Age Estimation Methods in Applied Anthropology
… with manuscript-specific variables including osteon population density (OPD), intact osteon population density (iOPD), fragmentary osteon population density (fOPD), type II osteon population density (tIIOPD), drifting osteon population density (dOPD), primary osteon population density (pOPD), …
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A comparative microscopic study of human and non-human long bone histology.
… cortical thickness, medullary cavity diameter, osteon count, osteon diameter, osteon area, osteon perimeter, Haversian canal diameter, Haversian canal area, Haversian canal perimeter, and Haversian lamella count per osteon by using image analysis, and viewed under a transmitted light microscope. …
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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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Design, Fabrication, and Characterization of Three Dimensional Complete Scaffolds for Bone Tissue Engineering
… scaffolds that mimic the organization of an osteon, the structural unit of cortical bone. Resulting scaffolds consisted of concentric layers of electrospun gelatin/PLLA nanofibers wrapped around microfiber core with diameters that ranged from 200-600µm. Individual osteon-like scaffolds were …
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Exploring Microstructural Signatures of Physiological Stress through Cross-Sectional Geometry and Cortical Bone Histology
… manually annotate remodeling events (including osteon morphotype) and ImageJ was used to automate osteocyte lacunae counts, allowing for histomorphometrics osteon morphotype and osteocyte lacunae densities to be derived. Cross-sectional properties for each individual were also collected in …
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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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The electromechanical effect in bone
… model for the piezoelectric behavior of an osteon in which an osteon resembles a radially-poled cylinder. There is some evidence that this model is applicable to an osteon, but further experimental work is needed to test the model. We have considered the possibility that trapped charge may …
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Relating cortical bone mechanics to intracortical pore morphology, distribution and remodeling history within the fibula diaphysis
… with the pore of a preexisting remodeling event (osteon) (5.9-fold higher odds). Conclusions: Collectively, these data show that the high SED pores are preferentially enlarged irregular pores positioned closer to the endosteal surface of the cortex, and that these pores tend to be resorptive pores …
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The use of histological methods to distinguish between burned remains of human and non-human bone
… Haversian system and Haversian canals as well as osteon circularity and osteon density. According to the qualitative results, the main structural bone tissue observed in all quadrants and two periosteal regions of unburned animal bone was primary vascular plexiform bone and irregular Haversian …
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Regression Analysis of Fracture Toughness for Secondary Osteons Located in Human Cortical Bone
… was carried out in order to locate and quantify osteon types within a sample of cortical bone taken from a human tibia. This was done using a microscope-camera assembly and the BioQuant computer software. The results of this were correlated with a previous experiment’s results on fracture …
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Characterization of swine femoral cortical bone using the reference point indentation technique
… month age groups. SEM images show no signs of osteon formation in 1 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 …
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Morphometric study of long bones histology
… traditional histomorphometric parameters such as osteon and Haversian canal areas, perimeter, and also diameters were measured. Comparisons of skeletal histomorphometric were established with the purpose of examining effects of histologic variation on an estimation of population origin, sex and …
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Multiscale modeling of elastic moduli and strength of bone
… (single lamella level), microscale (single osteon and interstitial lamella level in cortical bone and single trabecula level in trabecular bone), and mesoscale (cortical bone level and trabecular bone level). Different micromechanics methods, laminated composite materials theories, cellular …
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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
… lamella level), microscale (10 -500μm, single osteon level), and mesoscale (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 …
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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, …