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Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...

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Collagen morphology in human meniscal attachments: a SEM study.

Diego F Villegas1, Tammy L Haut Donahue

  • 1Department of Mechanical Engineering, Universidad del Turabo, Gurabo, Puerto Rico.

Connective Tissue Research
|April 15, 2010
PubMed
Summary

Scanning electron microscopy revealed distinct collagen fiber morphologies in human meniscal attachments. While crimping angles were uniform, crimp lengths varied between medial and lateral attachments, informing biomechanical models.

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Research
  • Connective Tissue Biology

Background:

  • Meniscal attachments are crucial for knee joint function.
  • Understanding their microstructural properties is key to developing effective treatments for meniscal injuries.

Purpose of the Study:

  • To qualitatively and quantitatively analyze the collagenous microstructure of human meniscal attachments.
  • To investigate morphological differences across zones from meniscus to bone insertion.
  • To determine collagen crimping parameters (angle and length) in these attachments.

Main Methods:

  • Qualitative analysis using scanning electron microscopy (SEM) on human knee meniscal attachments.
  • Quantitative analysis of collagen fiber crimping angle and length.
  • Comparison of morphological features and crimp parameters between different attachment zones and sides (medial/lateral).

Main Results:

  • SEM revealed distinct collagen fiber morphologies and sheath structures in different zones of meniscal attachments.
  • Collagen fiber crimping pattern diminished towards the bony insertion (enthesis).
  • Collagen crimping angles were consistent (~22°), but crimp lengths differed, being shorter in medial and longer in lateral attachments.

Conclusions:

  • SEM is effective for visualizing the microstructure of fibrous connective tissues like meniscal attachments.
  • The identified variations in collagen fiber morphology and crimp length provide essential data for microstructural modeling.
  • This research enhances understanding of the relationship between collagen architecture and the mechanical behavior of meniscal attachments.