Biomedical Engineering Reference
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A. It is necessary to use a lubricant to prevent wear
B. Frictional forces will be very high
C. Wear will be abrasive in character
D. Fatigue wear will likely occur
E. There will be no wear at all
ANSWER:
D
is the best answer.
PROBLEM 11.7
Wear in a metal-polymer total hip prosthesis (true or false)
1. May be easily detected
in vivo
2. May be produced by PMMA and bone fragments
3. Is confined to the acetabular component
4. Is confined to the femoral component
5. Occurs on both femoral and acetabular components, but unequally
ANSWER:
F, T, F, F, T.
PROBLEM 11.8
Hydrodynamic lubrication (select the best phrase[s])
A. Occurs at high loads and low speeds
B. Is desirable because it reduces turbulence
C. Is the lubrication mechanism in THRs
D. Results in a complete separation of the two surfaces
E. Can only occur if the surfaces are very smooth
ANSWER:
D
is the best answer.
PROBLEM 11.9
Wear debris (true or false)
1. Are spherical
2. Differ in size for different materials
3. May be retained between articulating surfaces
4. Are a rare occurrence
5. May produce third-body wear
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