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Three-dimensional microcomputed tomography imaging of basic multicellular unit-related resorption spaces in human
David M L Cooper1, C David L Thomas, John G Clement
1Department of Orthopaedics, Division of Orthopaedic Engineering Research, University of British Columbia, Vancouver, Canada. cooperdv@interchange.ubc.ca
Summary
This study used micro-CT to analyze bone resorption spaces in human femur samples. Resorption space density decreased with age in females, likely due to bone thinning, not reduced remodeling.
Area of Science:
- Orthopedics and Bone Biology
- Biomaterials and Imaging
- Human Anatomy and Physiology
Background:
- Basic multicellular units (BMUs) are fundamental to bone remodeling.
- Understanding age- and sex-related changes in BMU resorption spaces is crucial for bone health.
- Microcomputed tomography (micro-CT) offers high-resolution imaging for bone microstructure analysis.
Purpose of the Study:
- To investigate the relationship between age, sex, and the density and range of BMU-related resorption spaces in human cortical bone.
- To utilize micro-CT as a novel method for visualizing and quantifying these spaces.
- To test hypotheses regarding variations in resorption space density and range with aging and sex.
Main Methods:
- Employed microcomputed tomography (micro-CT) for high-resolution imaging of human anterior femoral midshaft samples (n=82, ages 18-92).
- Quantified the morphology, density, and range (length) of basic multicellular unit (BMU)-related resorption spaces (n=99).
- Performed statistical analyses (Spearman's correlation, t-tests) to assess age and sex effects, including numerical simulation for field-of-view correction.
Main Results:
- Resorption space density showed a negative correlation with age in combined sexes (rho=-0.355) and females (rho=-0.522).
- No significant difference in space density was found between sexes (P=0.735).
- The range of resorption spaces did not significantly correlate with age or differ between sexes, with a corrected mean range of approximately 3,770 microm.
Conclusions:
- The range of BMU-related resorption spaces is not significantly affected by age or sex.
- The observed age-dependent decrease in resorption space density is likely attributed to cortical rarefaction and imaging limitations, rather than reduced bone remodeling activity.
- Micro-CT is a valuable tool for characterizing bone resorption space morphology and density in human cortical bone.