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Evaluation of calcium and phosphorus elements in the developing human fetal long bone at different trimesters of

Kumar Megur Ramakrishna Bhat1, Vishwanath Managuli2, Lokadolalu Chandrachar Prasanna1

  • 1Department of Anatomy, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, India.

Anatomy & Cell Biology
|July 8, 2026
PubMed

Insights

This study quantifies fetal bone mineral composition, finding calcium levels vary significantly during pregnancy while phosphorus remains constant. This research offers insights into the fetal origins of adult bone diseases.

Area of Science:

  • Orthopedics
  • Developmental Biology
  • Biomineralization

Background:

  • Bone mineral composition and peak bone mass are crucial for preventing adult bone diseases.
  • Impairment during fetal development is linked to later-life bone disorders.
  • Quantitative data on fetal bone composition variations during growth is lacking.

Purpose of the Study:

  • To quantitatively analyze the mineral composition of developing human fetal humerus bone.
  • To investigate variations in calcium and phosphorus levels across different gestational periods.
  • To establish a foundation for understanding the fetal origins of adult bone diseases.

Main Methods:

  • Analysis of human fetal humerus bone specimens (10-36 weeks gestation).
  • Mineral composition analysis using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
  • Assessment of calcium (Ca) and phosphorus (P) levels and their ratio in cortical bone.

Main Results:

  • Calcium levels showed significant variation between 10-20 weeks and 24-36 weeks gestation.
  • Mean phosphorus levels remained relatively constant throughout the 12-36 week gestational period.
  • The calcium to phosphate ratio exhibited significant differences across various gestational weeks.

Conclusions:

  • This study provides preliminary quantitative data on fetal cortical bone mineral composition.
  • Observed variations in calcium and phosphorus highlight critical developmental periods.
  • Findings serve as a basis for future research on broader anatomical regions and functional correlations.

Keywords:
Bone developmentBone growthHumerusMineralTrimesters

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