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Ovariectomized rat model and shape variation in the bony labyrinth.

Devin L Ward1, Lauren Schroeder2, Alexander Tinius3

  • 1Department of Anthropology, University of Toronto, Toronto, Ontario, Canada.

Anatomical Record (Hoboken, N.J. : 2007)
|February 1, 2022
PubMed
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This summary is machine-generated.

Postmenopausal osteoporosis does not significantly alter inner ear semicircular canal shape or volume in rats. However, osteoporosis may contribute to subtle variations within species, warranting further microstructural investigation.

Area of Science:

  • Otolaryngology
  • Paleoanthropology
  • Bone Biology

Background:

  • Postmenopausal osteoporosis is a prevalent condition in aging populations.
  • The otic capsule (bony labyrinth) is generally considered to have limited remodeling post-development.
  • Osteoporosis-induced bone remodeling's effect on otic capsule shape is largely unexplored.

Purpose of the Study:

  • To investigate if postmenopausal osteoporosis alters the shape and volume of the semicircular canals.
  • To test the hypothesis that the otic capsule's shape and volume resist changes despite systemic bone remodeling.

Main Methods:

  • Utilized three-dimensional geometric morphometric shape analysis.
  • Analyzed microcomputed tomographic data from ovariectomized (OVX) and sham-controlled rat models.
Keywords:
agingbone QCT/μCTmorphologyosteoporosisremodeling

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  • Performed Procrustes ANOVA and morphological disparity testing.

    • Main Results:

    • No statistically significant differences in semicircular canal shape or volume were found between OVX and sham groups.
    • While the OVX group showed greater variation, it did not reach statistical significance.
    • Labyrinthine shape appears robust against osteoporosis-induced remodeling in this model.

    Conclusions:

    • Semicircular canal shape remains a reliable indicator for phylogenetic and functional assessments in fossils.
    • Osteoporosis might contribute to intraspecific variation in bony labyrinth shape.
    • Further microstructural research is needed to explore osteoporosis's subtle effects on the bony labyrinth.