Trabecular Bone Contributes to Strength of the Proximal Femur Under Mediolateral Impact in the Avian

[+] Author and Article Information
N. Passi, A. Gefen

Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel

J Biomech Eng 127(1), 198-203 (Mar 08, 2005) (6 pages) doi:10.1115/1.1835366 History: Received December 09, 2003; Revised August 18, 2004; Online March 08, 2005
Copyright © 2005 by ASME
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Grahic Jump Location
Longitudinal cross sections through proximal femora of (a) poultry (with the limb skeleton shown on the left) and (b) human. Cross sections are scaled to similar size to allow comparisons of proportional thickness of the cortex and the trabecular architecture. Architecture of the avian femur was depicted based on anatomical observations by the authors. Dominant stresses on the human femoral cortex are marked with bold arrows (tension ←→; compression (→←).
Grahic Jump Location
The experimental setup: (a) The low impact pendulum testing machine (LIPTM); (b) illustrations of specimen preparation showing removal of core trabecular tissue (upper right) and the proximal femur specimen fixed prior to impact testing (left). The Charpy hammer (design shown on bottom right) strikes under the femoral head.
Grahic Jump Location
Results of impact testing: (a) distribution of outcomes of impact testing of control specimens (N=35) depending on the impact energy Ep, and (b) outcomes of fracture tests with noncontrol specimens (N=95) plotted as function of the amount of core trabecular tissue that was extracted from the epiphysis in each trial (absolute weight W and weight fraction in %). A region of “no-break” outcomes (shaded) and a “break” threshold (dashed line) are marked. NB=no break,P=partial break,C=complete break.



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