AI Article Synopsis
- The study investigates how different types of osteons behave when twisted (torque applied) around their axis.
- Two types of osteons are examined: fully calcified 'longitudinal' osteons with fibers arranged in a spiral for strength and 'alternate' osteons with fibers arranged differently that show less resistance.
- Results reveal that longitudinal osteons are more resistant to twisting forces, and the study discusses why alternate osteons, with their unique fiber arrangement, are weaker under such stress.
Article Abstract
The aim of the present investigation is to determine the mechanical behavior of single selected osteons loaded by torsion along their axis. Two osteon types were chosen: (a) fully calcified 'longitudinal' osteons, whose fibers (and, consequently, crystallites) have a marked longitudinal spiral course in successive lamellae, (b) fully calcified 'alternate' osteons, whose fibers (and, consequently, crystallites) have a marked longitudinal spiral course in one lamella, and an apparently transverse or circular course in the next. The osteon samples, which were cylindrically shaped, and whose extremities fitted into two rectangular lugs, were prepared on a microturning lathe. The principle of the specially manufactured torsional device was that of a pendulum set oscillating around a very sharp wedge so as to reduce friction to negligible levels. The results indicate that longitudinal osteons are those most resistant to torsional loading. The low resistance to torsional loading of the lamellae whose fibers apparently have an almost transversal course is discussed with reference to recent views on the microstructure of this type of lamella.
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| http://dx.doi.org/10.1016/0021-9290(94)90260-7 | DOI Listing |
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