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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 stressstrain 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 stressstrain curve appearances of brittle and ductile materials.

Brittle materials have linearly perfect stressstrain 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
