Testing the biomechanical optimality of the wall thickness of limb bones in the red fox (Vulpes vulpes)
| Autor: | Balázs Bernáth, Gábor Csorba, Gábor Horváth, Bence Suhai, Balázs Gerics, Mihály Gasparik |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Tubular bone
Hungary Yield (engineering) Materials science biology Vulpes Rehabilitation Biomedical Engineering Biophysics Foxes Anatomy In Vitro Techniques biology.organism_classification Biomechanical Phenomena Radiography Limb bones Bone Density Bone Marrow Image Processing Computer-Assisted Relative mass Animals Orthopedics and Sports Medicine Femur Bone mechanics Wall thickness |
| Zdroj: | Journal of Biomechanics. 37:1561-1572 |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/j.jbiomech.2004.01.008 |
| Popis: | The optimum for the ratio K of the internal to external diameter of a marrow-filled tubular bone with minimum mass designed to withstand a given type of strength (yield/fatigue, stiffness, fracture or impact) depends on Q ¼ rm=rb only, where rm and rb are the densities of marrow and bone. With computer-assisted evaluation of radiographs of 62 femurs in the red fox (Vulpes vulpes )w e measured the values of K: The mean and standard deviation of K are 0.68 and 0.036, and K changes in the rather wide range from 0.59 to 0.74. Accepting the assumption of earlier authors that Q ¼ 0:50 or 0.44, our data would support the hypothesis that the fox femurs are optimized to withstand yield, fatigue or stiffness strengths. However, since the Q-values are unknown, the possibility cannot be excluded that anystudied fox bone with an appropriatelyselected Q-value is optimized for anystrength type. Assuming Q ¼ 0:50 or 0.44, the relative mass increments m of the investigated fox bones are smaller than 5% under all four mechanical conditions. The evolutionaryrelevance of such tiny m-values is questionable. r 2004 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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