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Corrosion at the interface of cobalt-alloy heads on titanium-alloy stems
J P Collier1, V A Surprenant, R E Jensen
1Dartmouth Biomedical Engineering Center, Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755.
Clinical Orthopaedics and Related Research
|October 1, 1991
Abstract:
The combination of a cobalt-alloy head on a titanium-alloy femoral hip stem is widely accepted for press-fit and biologic fixation applications. Examination of 30 components retrieved at periods of 0.5 to 66.9 months for histologic examination of tissue ingrowth revealed that 56.6% of the tapered connections between head and stem showed evidence of crevice corrosion leading to concerns of metal ion release and the potential failure of head to stem fixation.