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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Spongy Bone01:09

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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The Bone Matrix01:18

The Bone Matrix

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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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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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Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts—...
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Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
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Fragility Assessment of Bovine Cortical Bone Using Scratch Tests

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Bone Material Properties and Skeletal Fragility.

David P Fyhrie1, Blaine A Christiansen

  • 1Department of Orthopaedic Surgery, University of California-Davis Medical Center, 4635 2nd Ave, Suite 2000, Sacramento, CA, 95817, USA, dpfyhrie@ucdavis.edu.

Calcified Tissue International
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PubMed
Summary
This summary is machine-generated.

Osteoporosis causes bone fractures from normal stress by affecting bone

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Materials Science

Background:

  • Osteoporosis leads to vertebral deformation and long bone fractures under normal loading.
  • Current imaging (QCT, MRI) assesses bone geometry and mineral content but not mechanical properties or repair capacity.
  • Predicting fractures requires understanding the mechanical properties of bone tissue and its damage repair mechanisms.

Purpose of the Study:

  • To identify essential material properties for predicting unexpected bone failure in osteoporosis.
  • To present methods for measuring these mechanical properties and discuss their limitations.
  • To focus on characterizing reduced bone toughness due to fatigue, drugs, and matrix damage.

Main Methods:

  • Review of current literature on bone mechanical properties and fracture prediction.
  • Discussion of quantitative computed tomography (QCT) and magnetic resonance imaging (MRI) capabilities.
  • Analysis of techniques for measuring bone tissue's mechanical properties, including toughness and fatigue resistance.

Main Results:

  • Bone geometry and mineral content are insufficient for predicting osteoporosis-related fractures.
  • Mechanical properties of hard tissue and bone's capacity for damage repair are critical.
  • Methods exist to measure these properties, but each has drawbacks.

Conclusions:

  • Accurate fracture prediction in osteoporosis necessitates measuring specific material properties beyond geometry and mineral content.
  • Understanding bone toughness loss from fatigue, drugs, and matrix damage is key.
  • Further research and refined measurement techniques are needed to improve fracture risk assessment.