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Metallurgy: TKR

- Discussion:
 - femoral component is made of chrome colbalt alloy w/ its proven wear characteristics articulating with high density poly ethylene;
 - tibial & patella components are metal backed w/ titanium alloy;
 - enhance fatigue strength of titanium decreases potential for stress fracture of the metallic tibial tray;
 - in metal back patella component, the use of titanium allows thicker polyethylene to decrease the chance of failure by wearing through of
      polyethylene surface