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 (base x height) to the 3rd power
  • Area Moment of Inertia (I)
    • Closely related to bending rigidity
      • area moment of inertia is a function of: structure width, thickness, and polar moment of inertia (J)
        • polar moment of inertia represents an object resistance to torsion
  • Deflection
    • Proportional to: (applied force/elastic modulus)(area moment of inertia)

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