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Age-related histological changes in rat tibia.

Q Ni1, H Chen1, Y Tan1

  • 1Department of Orthopaedic Surgery, Zhongnan Hospital of Wuhan University, Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan, China.

Folia Morphologica
|November 10, 2020
PubMed
Summary
This summary is machine-generated.

This study dynamically tracked osteochondral development in Wistar rats from embryo to adult, revealing key morphological changes and the role of cartilage canals in ossification. These findings provide crucial data for understanding bone and cartilage tissue development.

Keywords:
cartilage anlagecartilage canalosteochondroplasiaprimary ossification centresecondary ossification centre

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Area of Science:

  • Developmental Biology
  • Orthopedics
  • Histology

Background:

  • Current osteochondral morphogenesis studies lack dynamic, longitudinal observation from initiation to maturity.
  • Existing research often relies on static snapshots or pattern diagrams, limiting comprehensive understanding.
  • Dynamic tracking is essential for enriching knowledge of bone and cartilage tissue structure development.

Purpose of the Study:

  • To dynamically observe skeletal morphology and structure changes in Wistar rats from embryonic stages to adulthood.
  • To provide foundational research data for the field of osteochondral development.
  • To specifically investigate the role of cartilage canals in secondary ossification center formation.

Main Methods:

  • Intrauterine and postnatal experiments utilizing Wistar rats at various gestational days (GD) and postnatal weeks (PW).
  • Tibia samples were collected, processed into paraffin-embedded sections, and stained with Safranin-O-fast-green and haematoxylin.
  • Morphological development was observed using light microscopy to track changes in cartilage and bone structures.

Main Results:

  • Joint space formation and chondrocyte hypertrophy were observed from GD17.
  • Primary ossification centers and epiphysis growth plate structures were evident by GD20.
  • Secondary ossification centers formed by postnatal day 14, with articular cartilage stratification and tidemark development observed by PW12.
  • Growth plates were visible throughout, with abnormal morphology noted by PW28.

Conclusions:

  • This study provides the first dynamic observation of osteochondral morphological changes during critical developmental periods.
  • The research highlights the process of cartilage canal involvement in the formation of the secondary ossification center.
  • The findings contribute valuable data for understanding the complete timeline of osteochondral development from embryo to adult.