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Assessment of cortical bone elasticity and strength: Mechanical testing and ultrasound provide complementary data

Grimal, Quentin ; Haupert, Sylvain ; Mitton, David ; Vastel, Laurent ; Laugier, Pascal

Medical engineering & physics, 2009-11, Vol.31 (9), p.1140-1147 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    Assessment of cortical bone elasticity and strength: Mechanical testing and ultrasound provide complementary data
  • Autor: Grimal, Quentin ; Haupert, Sylvain ; Mitton, David ; Vastel, Laurent ; Laugier, Pascal
  • Assuntos: Adult ; Anisotropy ; Biomechanical Phenomena ; Bone Density ; Compressive Strength ; Cortical bone ; Elastic Modulus ; Elasticity ; Equipment Design ; Female ; Femur - anatomy & histology ; Femur - diagnostic imaging ; Femur - pathology ; Humans ; Male ; Middle Aged ; Pressure ; Radiology ; Strength ; Stress, Mechanical ; Tensile Strength ; Ultrasonics ; Ultrasonography ; Ultrasound
  • É parte de: Medical engineering & physics, 2009-11, Vol.31 (9), p.1140-1147
  • Notas: ObjectType-Article-1
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  • Descrição: Abstract Cortical bone is a compact tissue with anisotropic macroscopic mechanical properties determined by a microstructure and the quality of a mineralised collagen matrix. Anisotropic elastic properties and strength are usually measured on different groups of sample which can hardly be pooled; as a consequence little is known on the relationships between strength and elasticity in the different anatomical directions. A method is presented to measure on a same cortical bone sample: (1) Young's modulus and strength ( σmax ) in the longitudinal direction; (2) stiffness ( C11 ) in the transverse direction. Longitudinal and transverse direction are taken along and perpendicular to the diaphysis axis, respectively. Ultrasonic techniques yield Young's modulus ( E a ) and C11 ; three-point bending tests yield Young's modulus ( E ) and σmax . The relationships between strength, elasticity and density and their anatomical distributions were investigated for 36 human femur samples. (i) A marginal negative correlation was obtained for E a and C11 ( R = −0.21; p = 0.08); (ii) σmax was significantly correlated to E and E a ( R ∼ 0.5; p < 0.005) but not to C11 ( p > 0.2); (iii) density was not correlated with E and moderately with strength ( R = 0.38; p < 0.3). Small density variability (±30 kg m−3 ) may partly explain the results. The techniques presented are suited to a systematic characterization of bone samples.
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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