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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Related Experiment Video

Updated: Jun 4, 2026

Semiautomated Longitudinal Microcomputed Tomography-based Quantitative Structural Analysis of a Nude Rat Osteoporosis-related Vertebral Fracture Model
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Recent progress in bone imaging for osteoporosis research.

Masako Ito1

  • 1Department of Radiology, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki, 852-8501, Japan. masako@nagasaki-u.ac.jp

Journal of Bone and Mineral Metabolism
|February 9, 2011
PubMed
Summary

Advanced bone imaging techniques like DXA and CT enable detailed analysis of bone structure from macro to nano levels. These methods aid in understanding aging, therapeutic effects, and bone strength for clinical applications.

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Area of Science:

  • Orthopedics and Radiology
  • Biomedical Engineering
  • Skeletal Biology

Background:

  • Bone imaging technologies have evolved significantly, offering macro-, micro-, and nano-level structural analysis.
  • Quantitative assessment tools include dual X-ray absorptiometry (DXA), quantitative computed tomography (QCT), high-resolution CT (HR-CT), and high-resolution magnetic resonance (HR-MR).
  • Micro-CT (μCT) and synchrotron μCT (SR-CT) provide higher resolution for in vitro and nano-level analysis, respectively.

Purpose of the Study:

  • To review current bone imaging techniques for assessing bone structure and biomechanical properties.
  • To highlight the advantages and limitations of various imaging modalities, including radiation dose and resolution.
  • To discuss the application of these techniques in understanding skeletal aging, therapeutic interventions, and hip geometry.

Main Methods:

  • Quantitative assessment of bone macrostructure using DXA and QCT (including vQCT).
  • In vivo assessment of trabecular bone microstructure via HR-CT and HR-MR.
  • In vitro and nano-level analysis using micro-CT (μCT) and synchrotron μCT (SR-CT).
  • Hip structure analysis (HSA) using both DXA (2D) and CT (3D) for biomechanical property assessment.

Main Results:

  • CT-based techniques offer high spatial resolution for axial skeleton visualization but involve radiation exposure.
  • μCT and SR-CT enable detailed elucidation of aging-related skeletal changes and therapeutic effects at micro and nano levels.
  • DXA-based HSA provides convenient 2D analysis of hip geometry and biomechanical properties, while CT-based HSA offers robust 3D analysis.

Conclusions:

  • Bone imaging technology continues to advance, offering new insights into bone structure-strength relationships.
  • These techniques are crucial for understanding physiological changes, evaluating treatments, and assessing fracture risk.
  • Future developments promise enhanced clinical utility for analyzing bone structural properties in daily practice.