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Related Concept Videos

Spongy Bone01:09

Spongy Bone

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...
The Bone Matrix01:18

The Bone Matrix

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 acid or...
Compact Bone01:27

Compact Bone

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...
Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

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— that give the...
Bone Structure01:55

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
Bode Plots Construction01:24

Bode Plots Construction

The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):

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Trabecular Bone Microarchitecture Evaluation in an Osteoporosis Mouse Model
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Effect of human trabecular bone composition on its electrical properties.

J Sierpowska1, M J Lammi, M A Hakulinen

  • 1Department of Physics, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland. Joanna.Sierpowska@uku.fi

Medical Engineering & Physics
|November 14, 2006
PubMed
Summary

Electrical properties of bone, like permittivity, can predict its organic composition, including fat and water content. This research links electrical measurements to bone tissue characteristics for potential clinical applications.

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Area of Science:

  • Biomaterials Science
  • Biophysics
  • Orthopedics

Background:

  • Bone mechanical properties depend on mineral density, structure, and organic composition.
  • Impedance spectroscopy shows promise for assessing bone mineral density and strength.
  • Systematic investigation of electrical properties related to bone's organic composition is lacking.

Purpose of the Study:

  • To investigate the relationships between the organic composition of human trabecular bone and its electrical/dielectric properties.
  • To determine how parameters like fat, water, collagen, and glycosaminoglycan content correlate with impedance spectroscopy measurements.
  • To explore potential clinical applications of these correlations.

Main Methods:

  • Organic composition of 26 human trabecular bone samples was analyzed.
  • Electrical and dielectric properties (relative permittivity, loss factor, conductivity, etc.) were measured across a wide frequency range (50 Hz to 5 MHz).
  • Correlations between organic composition parameters and electrical properties were statistically analyzed.

Main Results:

  • Relative permittivity at 1.2 MHz strongly correlated with trabecular bone fat content (r = -0.85).
  • Relative permittivity at 200 Hz predicted water content (r = 0.83).
  • Phase angle, specific impedance, and conductivity related strongly to dry density and water content (|r| ≥ 0.69).
  • Collagen content showed a moderate correlation with relative permittivity at 1.2 MHz (r = 0.64).
  • Glycosaminoglycan content did not show significant correlations with electrical parameters.

Conclusions:

  • Electrical and dielectric properties are significantly influenced by the organic composition of trabecular bone.
  • Permittivity measurements at specific frequencies can predict bone water and fat content.
  • These findings could aid in calculating current field distribution for applications like electrical stimulation of osteogenesis or intraoperative implant assessment.