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Related Experiment Videos

Human bone microstructure studied by collagenase etching.

I G Mackie1, M Green, H Clarke

  • 1Department of Traumatic and Orthopaedic Surgery, UWCM, Cardiff Royal Infirmary, Wales.

The Journal of Bone and Joint Surgery. British Volume
|May 1, 1989
PubMed
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Bone

Area of Science:

  • Biomineralization and Bone Structure

Background:

  • Bone's mineral component, hydroxyapatite, is crucial for skeletal integrity.
  • Understanding hydroxyapatite's nanoscale organization is key to bone health.

Purpose of the Study:

  • To investigate the microstructural organization of bone mineral (hydroxyapatite).
  • To visualize the arrangement of hydroxyapatite units within the bone matrix.

Main Methods:

  • Iliac crest bone samples from healthy individuals were used.
  • Collagen was removed using collagenase to isolate the mineral phase.
  • Scanning electron microscopy (SEM) was employed for high-resolution imaging of polished and unpolished surfaces.

Main Results:

  • Bone mineral is composed of ~10 nm rounded units that aggregate into ~100 nm spheroids.

Related Experiment Videos

  • These spheroids form interconnected columns, creating a continuous mineral phase.
  • SEM revealed voids left by collagen removal, indicating its structural role.

    • Conclusions:

    • Bone mineral hydroxyapatite exhibits a hierarchical structure from nanoscale spheroids to larger columns.
    • This organization contributes to bone's overall mechanical properties and structural integrity.