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Related Concept Videos

Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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The Bone Matrix01:18

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Osteoclasts in Bone Remodeling01:31

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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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X-ray Diffraction of Biological Samples01:10

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Updated: Mar 17, 2026

A Sectioning, Coring, and Image Processing Guide for High-Throughput Cortical Bone Sample Procurement and Analysis for Synchrotron Micro-CT
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Characterizing microcrack orientation distribution functions in osteonal bone samples.

U Wolfram1,2, J J Schwiedrzik2,3, M J Mirzaali2

  • 1School of Engineering and Physical Science, Institute for Mechanical, Process and Energy Engineering, Heriot-Watt University, United Kingdom.

Journal of Microscopy
|July 16, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to analyze 3D microcrack distributions in bone. This technique reveals distinct microcrack patterns under different loads, improving our understanding of bone strength and failure related to age and disease.

Keywords:
Cortical boneX-ray phase micro-tomographymicrocrack segmentationmicrodamageorientation distribution functionsynchrotron radiation

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Area of Science:

  • Biomaterials Science
  • Biomechanics
  • Materials Science

Background:

  • Prefailure microdamage significantly impacts bone strength and toughness, particularly with aging and disease.
  • Understanding the 3D distribution and morphology of microcracks is crucial for assessing bone mechanics.
  • Current histological and stereological methods are insufficient for characterizing 3D microcrack networks.

Purpose of the Study:

  • To develop a novel methodology for characterizing three-dimensional microcrack distributions in bulk bone samples.
  • To analyze the influence of different loading conditions (tension, compression, torsion) on microcrack morphology and orientation.
  • To establish a quantitative approach for microdamage assessment in bone.

Main Methods:

  • Human cortical bone specimens were subjected to tensile, compressive, or torsional loading beyond yield.
  • Synchrotron radiation micro-computed tomography (SRμCT) was employed for high-resolution imaging of microcracks.
  • A custom microcrack segmentation algorithm was developed to determine microcrack orientation distribution functions.

Main Results:

  • Distinct microcrack families and orientation distribution functions were identified for each loading condition.
  • Median microcrack areas varied significantly: 4.7 μm² (tension), 33.3 μm² (compression), and 64.0 μm² (torsion).
  • The segmentation algorithm demonstrated good accuracy against manual segmentation, and scale-dependent effects were observed.

Conclusions:

  • The proposed methodology enables detailed 3D analysis of microcrack distributions in overloaded bone.
  • The findings highlight scale separation between tensile, compressive, and torsional microcracks.
  • This approach offers improved insights into bone microdamage, its impact on failure, and its relation to aging and disease.