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22 Cards in this Set

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  • Back
Where is the center of gravity located at the level of the pelvis in the sagittal plane?
Anterior to the body of S2
What is the principal determinant of the magnitude of the JRF (joint
reaction force)?
Muscle activity around the joint
Define stress and strain
Stress = force/area (measure of internal strain)
Strain = change in length/original length (measure of deformability)
How is strain energy represented on the stress-strain diagram?
Area under the curve
Strain energy is a measure of what material property?
Toughness
What is the definition of toughness?
Ability of a material to absorb energy before it fails
What is the definition of stiffness?
Resistance of a material to deformation from an applied load
Compare the stress-strain curve appearances of brittle and ductile materials.
Brittle materials have linearly perfect stress-strain curves; no plastic deformation
Ductile materials allow for a large amount of plastic deformation
If cortical bone is the midline, working away from the midline in the direction of increasing elastic modulus are what four materials?
Titanium
Stainless steel
Cobalt chrome
Ceramic/alumina
Working away from the midline in the direction of decreasing elastic modulus are what three materials?
Polymethylmethacrylate
Polyethylene
Cancellous bone
What is the definition of fatigue failure?
Failure after many cycles of repetitive submaximal load
Fatigue failure will never occur if what condition is met?
Force is below the endurance limit of the material
As the strain rate increases, viscoelastic materials become more what?
Stiff (higher elastic modulus)
What is the definition of hysteresis?
Hysteresis refers to energy dissipation such that unloading and loading does not follow the same path
Stress relaxation of a liquid is essentially the same as what?
Creep
What formula determines the bending rigidity of a rectangle?
Base * height3
What formula determines the bending rigidity of a cylinder?
Radius4
The area moment of inertia is a measure of what?
Resistance to bending
What is the mass moment of inertia?
Measures resistance to rotation
What is the polar moment of inertia?
Measures resistance to torsion
Pitting and crevice corrosion are most likely with what material?
316L stainless steel is most likely to be associated with pitting and crevice corrosion
There is a classically increased risk of galvanic corrosion between what two metals?
316L stainless steel cobalt chrome