Section 18: Mechanical Properties of Bone 18-1
From: Vanwanseele 18-2
Load-deformation Relationships 18-3 From: Brown
From: Vanwanseele 18-4
From: Seeley 18-5
Bone Biomechanics Bone Biomechanics • Bone is anisotropic - its modulus is Bone is anisotropic its modulus is dependent upon the direction of loading. • Bone is weakest in shear, then tension, Bone is weakest in shear, then tension, then compression. • Ultimate Stress at Failure Cortical Bone Ultimate Stress at Failure Cortical Bone Compression < 212 N/m 2 < 146 N/m 2 Tension e s o 6 / < 82 N/m 2 Shear 18-6 From: Le
From: Vanwanseele 18-7
Load Deformation Testing 18-8 From: Brown
From: Vanwanseele 18-9
From: Gillet 18-10
From: Gillet 18-11
From: Gillet 18-12
Basic Biomechanics Basic Biomechanics • Anisotropic Anisotropic • Viscoelastic Viscoelastic – Mechanical properties – Stress-Strain dependent upon character dependent direction of loading upon rate of applied strain (time dependent). p ) 18-13 From: Le
From: Gillet 18-14
From: Seeley 18-15
Bone Remodeling • Bone is a dynamic tissue tissue. – What does that mean? • Wolff’s law • Wolff s law holds that bone will grow or remodel in or remodel in response to the forces or demands demands placed on it. Examine this with the bone with the bone on the left. 18-16 From: Imholtz
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