Abstract
Introduction
Static cortical bone histomorphometry utilised in forensic age-at-death estimation generally examines only the anterior femoral mid-shaft, as biomechanical strain at the posterior femur is thought to result in increased bone remodelling, osteon density and adversely affect age-at-death estimates. As osteon density increases there is a corresponding decrease in geometric variables, such as osteon area and Haversian canal diameter. The present study tests whether the inverse relationship between osteon density and osteon geometry is reflected in a modern documented Australian sample, and if this relationship differs between the anterior and posterior femoral mid-shaft.
Materials and methods
The study sample comprises 215 femoral microradiographs (117♂ 98♀) of recorded age (18‒97 years) from the Melbourne Femur Reference Collection (MFRC). The following variables were measured in Image J across six 1 mm2 regions of interest (ROIs) from the anterior and posterior; mean intact and fragmentary secondary osteon count, osteon population density, osteon and Haversian canal area, perimeter, and diameter.
Results
Osteon area was positively correlated with Haversian canal size and shape metrics, and negatively correlated with osteon density. Chronological age was significantly correlated with most variables. There were significant between-group effects between the youngest (18‒34 years) and all other age groups (35‒49, 50–74 and 75 + years) for both regions.
Conclusion
Our findings support an increased rate of remodelling associated with decreases in osteon geometry in the anterior and posterior femur. Future studies should examine static osteon histomorphometry using anterior and posterior measurements in larger samples of documented age and sex.
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Data availability
The data (microradiographs) that support the findings of this study are available from the Melbourne Femur Research Collection. Restrictions apply to the availability of these data, which were used under permission for this study. They are not publicly available due to privacy or ethical restrictions, requests for access can be made to: https://dental.unimelb.edu.au/research/melbourne-femur-research-collection#about.
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Acknowledgements
The authors thank Dr Rita Hardiman (Melbourne Dental School, The University of Melbourne) for facilitating access to the Melbourne Femur Reference Collection as well as everyone involved in the donation and preparation of the microradiographs used in this study. The authors would also like to thank the anonymous reviewers for their comments. This research was supported by an Australian Government Research Training Program (RTP) Scholarship.
Funding
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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AM: conceptualization (lead); data curation (lead); formal analysis (lead); methodology (lead); validation (lead); visualization (lead); writing-original draft (lead); writing-review and editing (equal). df: conceptualization (supporting); methodology (supporting); supervision (lead); writing-original draft (supporting); writing-review and editing (equal).
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774_2021_1204_MOESM1_ESM.png
Supplementary file1 Supplementary Fig.1: Scattergrams illustrating the distribution of data from anterior measurements in age group categories. Each scattergram shows five regression lines; one per age group and one representing the entire dataset (thicker black line) (PNG 136 KB)
774_2021_1204_MOESM2_ESM.png
Supplementary file2 Supplementary Fig. 2: Scattergrams illustrating the distribution of data from posterior measurements in age group categories. Each scattergram shows five regression lines; one per age group and one representing the entire dataset (thicker black line) (PNG 136 KB)
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Maggio, A., Franklin, D. An examination of histomorphometric relationships in the anterior and posterior human femoral cortex. J Bone Miner Metab 39, 649–660 (2021). https://doi.org/10.1007/s00774-021-01204-7
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DOI: https://doi.org/10.1007/s00774-021-01204-7