Updated: 6/17/2021

# Structural Properties

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• Introduction
• Charateristics of orthopaedic implants depend
• structural properties (this topic)
• material properties
• Structural characteristic differs from strength characteristic
• not only depends on the material, but also the structural configuation of the object (cylinder, rectangle)
• the stuctural properties can also be demonstrated in a stress vs. strain curve
• Bending Rigidity (stiffness)
• Definitions
• defined as the slope of the curve in the elastic range on a structure stress-strain curve
• stress shielding of proximal bone in THA is related to implant stem stiffness
• Solid Cylinder
• proportional to the radius to 4th power for a solid cylinder
• cylinder A has great rigidity than cyliner B on illustration above (and thus has greater radius)
• Hollow Cylinder
• proportional to the radius to the 3rd power for a hollow cylinder
• Rectangular Object
• proportional to the thickness to the 3rd power
• Area Moment of Inertia (I)
• Area moment of inertia
• is a property of shape that is used to predict deflection, bending and stress in beams, and is proportional to Length to the power of four
• is a function of: structure width, thickness, and polar moment of inertia (J)
• measure of the flexural stiffness of a beam (i.e. bending rigidity)
• Polar moment of inertia
• represents an object resistance to torsion
• Moment of inertia
• is a measure of an object's resistance to change in rotation direction
• Deflection
• Deflection is the degree to which a part of a structural element is displaced under a load (because it deforms)
• Proportional to: (applied force/elastic modulus)(area moment of inertia)

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