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Intermediate
A knee polyethylene insert contact model predicts peak pressure just below the published yield stress. The contact patch is very small and moves during gait. Which concern should the PE treat as most important?
No concern remains because static yield is never exceeded
Only bulk compression matters; contact pressure is irrelevant
The insert should be evaluated using brittle fracture criteria only
Wear and fatigue damage may still control even if peak pressure is below static yield
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