Abstract

Recently evidence has been given that as a rule the lamellar appearance of osteons is due to the presence of layers of parallely oriented collagen bundles, with the orientation of the bundles changing through about 90° in successive layers (4,6,9). On the other hand, Ascenzi and co-workers by micro-mechanical investigations showed that, in agreement with Gebhardt’s theory, lamellae whose fiber bundles and crystallites have a longitudinal course withstand loading by tension, whereas those whose fiber bundles and crystallites have a transversal course withstand loading by compression (2,3,5).

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