Self-test - Orthopaedic Biomaterials in Research and Practice - page 420

14. The physical process most likely producing the early localized
pain is: (select best answer[s])

A. Fretting ___

B. Failure of boundary lubrication ___

C. General corrosion ___

D. Galvanic corrosion ___

E. Crevice corrosion ___

(5)

15. The plate fracture is due to (select the best answer[s])

A. Stress relaxation ___

B. Creep ___

C. Corrosion ___

D. Fatigue ___

E. Hysteresis ___

(5)

16. The plate fragments can be almost perfectly fitted together. Mark
the following statements true or false :

The plate broke because stainless steel is too weak to be used
in internal fixation hardware.

___

The plate failure was a brittle fracture. ___

The plate failure was a high-stress, low-cycle failure. ___

The plate was probably damaged during insertion. ___

“Contouring” the plate might have contributed to its failure. ___

(10)

17. Corrosion products from implants ( true or false )

Produce elevated metal concentrations in plasma and urine ___

Are trapped in the implant site ___

May produce remote site immune responses ___

May be the result of manufacturing errors ___

Are bacteriostatic ___

(5)

18. Dynamic coefficients of friction (select the phrase that best com-
pletes the sentence)

A. Are predictive of wear rates ___

B. Are larger than static coefficients ___

C. Are larger for prosthetic joints than for natural ones ___

(3)