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Related Experiment Videos

Bone microstructure by collagenase etching.

M Green, D H Isaac, G M Jenkins

    Biomaterials
    |May 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    A new method reveals bone's mineral and collagen structure using scanning electron microscopy. This technique offers a clearer view of in vivo microstructures, detailing mineral particle aggregation and collagen fiber organization within osteons.

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    Area of Science:

    • Biomaterials Science
    • Skeletal Biology
    • Microscopy Techniques

    Background:

    • The spatial organization of mineral and collagen fibers in bone is crucial for its mechanical properties.
    • Previous preparative techniques for bone microstructural studies have led to diverse and sometimes conflicting observations.
    • Understanding the in vivo microarchitecture of bone is essential for diagnosing and treating skeletal diseases.

    Purpose of the Study:

    • To develop and present a novel technique for microstructural analysis of bone using scanning electron microscopy (SEM).
    • To investigate the detailed morphology of the mineral component in bone.
    • To elucidate the arrangement of collagen fibers within the osteons of compact bone.

    Main Methods:

    • A novel SEM-based technique involving collagenase treatment of cut and polished bone surfaces.

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  • Selective removal of the organic matrix (collagen) to expose the mineral component.
  • High-resolution imaging to reveal microstructural details of mineral aggregates and collagen fiber organization.

    • Main Results:

    • The mineral component of bone is revealed to be composed of 'crystallites' (approx. 20 nm) aggregating into 'spheroidal particles' (approx. 100 nm), which further form 'granules' (approx. 500 nm).
    • The collagenase treatment clearly delineated regions of collagen removal, showing alternating lamellae within osteons with distinct collagen fiber orientations.
    • Collagen fibers were observed to be oriented circumferentially and parallel to the Haversian canal in alternating lamellae.

    Conclusions:

    • The developed collagenase-SEM technique provides a more accurate representation of in vivo bone microstructures compared to previous methods.
    • This technique offers unprecedented detail on the hierarchical organization of bone mineral.
    • The study clarifies the complex arrangement of collagen fibers within osteons, contributing to a better understanding of bone structural biology.