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Postnatal morpho-functional development of a dog's meniscus.

Silvia Clotilde Modina1, Lucia Aidos1, Valentina Rafaela Herrera Millar2

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Summary

Canine meniscus development shows significant morpho-functional changes from birth to adulthood. This study tracks knee joint development, revealing key changes in collagen and glycosaminoglycans during growth.

Keywords:
Collagen fibersDevelopmentDogGAGsMeniscus morphology

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Area of Science:

  • Veterinary Anatomy
  • Developmental Biology
  • Orthopedics

Background:

  • Menisci are crucial for knee joint function, yet their developmental processes, especially in canine models, are poorly understood.
  • Understanding canine meniscal morphogenesis provides insights into knee joint health and potential injury mechanisms.

Purpose of the Study:

  • To investigate the morpho-functional development of canine menisci from neonatal to adult stages.
  • To characterize changes in collagen composition, glycosaminoglycan content, and biomechanical properties during meniscal growth.

Main Methods:

  • Scanning Electron Microscopy (SEM) for structural analysis.
  • Histochemistry (Safranin O, Picro Sirius Red) and immunofluorescence for collagen typing (Type I, II, III).
  • Biomechanical compression testing and biochemical assays for glycosaminoglycans (GAGs) and DNA content.

Main Results:

  • Menisci flatten and smooth out during postnatal development, with glycosaminoglycan deposition beginning around 30 days.
  • Collagen composition shifts from predominantly Type I in neonates to increased regionalization and crimping in adults, with Type III collagen appearing later.
  • Biomechanical properties and cellularity decrease with age, indicating a maturation process linked to functional load.

Conclusions:

  • Canine meniscal development involves significant structural and compositional changes, correlating with locomotor maturation.
  • Postnatal development, influenced by movement and load, is critical for the meniscus to acquire its mature functional capacity.
  • This study provides a foundational understanding of canine meniscal morphogenesis relevant to veterinary orthopedics.