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The bone density, mineral content and average shear stress in bending at failure were measured in vitro in 33 femoral necks of women and men of different ages. The correlations between these three parameters as well as their correlation with the Singh index were carefully analyzed and found to show that the Singh index is of no clinical value. The best correlation exists between bone density and shear stress at failure. Practically no correlation is found between the breaking stress and Singh index. The breaking stress decreases with age much faster than the bone density or bone mineral content. The correlation between the work to fracture and the bone density or its mineral content is only moderate. The bone density is best indicator for the compressive bone strength. The changes of bone strength are apparently influenced by factors other than the bone density and mineral content, although the possibility that small changes in bone density or mineral content cause large changes in bone strength cannot be excluded.
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