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A cemented, cast CoCr alloy, Omnifit Plus femoral stem was retrieved following mid-stem fracture after 24 years in vivo. The patient was an active 55-year-old male with a high body mass index (31.3) and no traumatic incidents before stem fracture. Fractographic and fatigue-based failure analyses were performed to illuminate the etiology of fracture and retrospectively predict the device lifetime. The fracture surfaces show evidence of a coarse grain microstructure, intergranular fracture, and regions of porosity. The failure analysis suggests that stems with similar metallurgical characteristics, biomechanical environments, and in vivo durations may be abutting their functioning lifetimes, raising the possibility of an increased revision burden.

Scanning electron microscopy (SEM) and electron back-scattered diffraction patterns (EBSP) have been employed to investigate the changes in the microstructure and texture of 90 % cold-rolled nickel when subjected to directional recrystallization. The effects of annealing temperature, hot zone velocity, and temperature gradient ahead of the hot zone on the microstructure were investigated.

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