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Corrosion behavior of tantalum-coated cobalt-chromium modular necks compared to titanium modular necks in a simulator test.

Corrosion behavior of tantalum-coated cobalt-chromium modular necks compared to titanium modular necks in a simulator test.

The Journal of arthroplasty (2013-10-09)

Ulrich Dorn, Daniel Neumann, Mario Frank

ABSTRACT

This study compared the corrosion behavior of tantalum-coated cobalt-chromium modular necks with that of titanium alloy modular necks at their junction to titanium-alloy femoral stem. Tests were performed in a dry assembly and two wet assemblies, one contaminated with calf serum and the other contaminated with calf serum and bone particles. Whereas the titanium modular neck tested in the dry assembly showed no signs of corrosion, the titanium modular necks tested in both wet assemblies showed marked depositions and corrosive attacks. By contrast, the tantalum-coated cobalt-chromium modular necks showed no traces of corrosion or chemical attack in any of the three assemblies. This study confirms the protective effect of tantalum coating the taper region of cobalt-chromium modular neck components, suggesting that the use of tantalum may reduce the risk of implant failure due to corrosion.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Tantalum, foil, thickness 0.05 mm, ≥99.9% trace metals basis

Sigma-Aldrich

Tantalum, powder, −325 mesh, 99.9% trace metals basis

Sigma-Aldrich

Tantalum, powder, 60-100 mesh, 99.9%

Tantalum, foil, 10mm disks, thickness 0.03mm, as rolled, 99.9%

Tantalum, foil, 10mm disks, thickness 0.0075mm, 99.9%

Tantalum, foil, 10mm disks, thickness 0.0125mm, 99.9%

Tantalum, foil, 10mm disks, thickness 0.015mm, 99.9%

Tantalum, rod, 50mm, diameter 12.7mm, annealed, 99.9%

Tantalum, foil, 4mm disks, thickness 0.75mm, annealed, 99.9%

Tantalum, foil, 6mm disks, thickness 0.009mm, 99.9%

Tantalum, foil, not light tested, 25x25mm, thickness 0.001mm, 99.9%

Tantalum, foil, 8mm disks, thickness 0.25mm, annealed, 99.9%

Tantalum, foil, not light tested, 50x50mm, thickness 0.0015mm, 99.9%

Tantalum, tube, 100mm, outside diameter 0.31mm, inside diameter 0.19mm, wall thickness 0.06mm, as drawn, 99.9%

Tantalum, foil, 6mm disks, thickness 0.0125mm, 99.9%

Tantalum, foil, not light tested, 25x25mm, thickness 0.0015mm, 99.9%

Tantalum, tube, 100mm, outside diameter 3.0mm, inside diameter 2mm, wall thickness 0.5mm, as drawn, 99.9%

Tantalum, foil, not light tested, 82x100mm, thickness 0.006mm, 99.9%

Tantalum, foil, light tested, 25x25mm, thickness 0.006mm, 99.9%

Tantalum, rod, 50mm, diameter 18mm, annealed, 99.9%

Tantalum, foil, light tested, 25x25mm, thickness 0.015mm, 99.9%

Tantalum, foil, 6mm disks, thickness 0.015mm, 99.9%

Tantalum, foil, not light tested, 50x50mm, thickness 0.01mm, 99.9%

Tantalum, foil, light tested, 25x25mm, thickness 0.01mm, 99.9%

Tantalum, foil, 8mm disks, thickness 0.025mm, as rolled, 99.9%

Tantalum, foil, light tested, 100x100mm, thickness 0.034mm, as rolled, 99.9%

Tantalum, rod, 1000mm, diameter 1.0mm, 99.9%

Tantalum, tube, 100mm, outside diameter 3.5mm, inside diameter 3.1mm, wall thickness 0.2mm, as drawn, 99.9%

Tantalum, foil, not light tested, 25x25mm, thickness 0.01mm, 99.9%

Tantalum, foil, not light tested, 100x100mm, thickness 0.003mm, 99.9%