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Updated: May 8, 2025
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Cantilever Bending of Murine Femoral Necks
Published on: January 5, 2022
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Exploring developmental changes in femoral midneck cross-sectional properties.
Julia Muñoz-Guarinos1, Laura Rodríguez1,2, José Miguel Carretero1,3,4
1Laboratorio de Evolución Humana, Universidad de Burgos, Edificio I+D+i/CIBA, Burgos, Spain.
Anatomical Record (Hoboken, N.J. : 2007)
|December 27, 2024
Summary
The human femoral midneck shows a unique growth pattern, with rapid area expansion until adolescence and stable morphology thereafter. Unlike the femoral diaphysis, its development is not significantly impacted by the acquisition of bipedal gait.
Area of Science:
- Human anatomy
- Paleoanthropology
- Biomechanics
Background:
- Previous research explored femoral cross-sectional properties during growth.
- The femoral midneck's ontogenetic changes were not previously detailed.
Purpose of the Study:
- To establish the ontogenetic pattern of cross-sectional properties at the human femoral midneck.
- To compare these patterns with other femoral regions (proximal, midshaft, distal).
Main Methods:
- Analysis of 99 archaeological femora (70 non-adults, 29 adults).
- Computed tomographic scans and ImageJ MomentMacro plugin for property extraction.
- Statistical analysis using LOESS, segmented regressions, and Wilcoxon tests.
Main Results:
- The femoral midneck exhibits a distinct growth pattern: rapid area increase until adolescence, then slower growth into adulthood.
- Relative cortical area remained stable throughout ontogeny.
- Femoral midneck morphology showed stability, with key changes in early adolescence and adulthood.
- Bipedal gait acquisition did not significantly alter midneck morphology, unlike the femoral diaphysis.
Conclusions:
- The human femoral midneck possesses a unique ontogenetic trajectory.
- Its morphology is relatively stable during growth, with significant shifts at adolescence and adulthood.
- Adaptation to bipedalism has a lesser impact on the femoral midneck compared to other femoral regions.
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