title: The dynamic shear modulus of bone in dependence on the form.
abstract: Torsional testing of fresh cortical bovine bone showed highly divergent shear moduli at various sites in the middle part of the diaphysis of the right metacarpus. Two hundred samples taken from twenty-five bones were investigated with a free oscillating torsional pendulum to determine the dynamic shear modulus. The results clearly demonstrate the mutual dependence between the shape of the metacarpus and the modulus of the material. On the basis of the analysis of forty-eight samples, a positive correlation was found between the amount of Ca2+ and PO4(3)-ions in the bone and the shear modulus. The hypothesis is put forward that in bone, normal adaptation to increasing stress is obtained by a change in the modulus values, Wolff's law only being operative for extreme cases.
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000032:analysis / Q000033:anatomy & histology; D002118:Calcium / Q000032:analysis; D004548:Elasticity; D005260:Female; D000882:Haplorhini; D010710:Phosphates / Q000032:analysis
chemical_list: D010710:Phosphates; D002118:Calcium