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

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Tantalum, foil, light tested, 50x50mm, thickness 0.01mm, 99.9%

GF76534500

Tantalum, foil, 100x100mm, thickness 0.100mm, annealed, 99.9%

692824

Sigma-Aldrich

Tantalum, powder, 60-100 mesh, 99.9%

357243

Sigma-Aldrich

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

262846

Sigma-Aldrich

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

GF77910082

Tantalum, foil, light tested, 100x100mm, thickness 0.015mm, 99.9%

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Tantalum, foil, 50mm disks, thickness 0.0075mm, 99.9%

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Tantalum, foil, light tested, 50x50mm, thickness 0.006mm, 99.9%

GF66499891

Tantalum, foil, 6mm disks, thickness 0.02mm, 99.9%

GF27272167

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

GF01901539

Tantalum, foil, not light tested, 50x50mm, thickness 0.002mm, 99.9%

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Tantalum, foil, not light tested, 100x100mm, thickness 0.005mm, 99.9%

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Tantalum, rod, 50mm, diameter 6.35mm, annealed, 99.9%

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Tantalum, tube, 100mm, outside diameter 1.02mm, inside diameter 0.86mm, wall thickness 0.08mm, as drawn, 99.9%

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Tantalum, foil, not light tested, 25x25mm, thickness 0.004mm, 99.9%

GF02019956

Tantalum, mesh, 40x40mm, nominal aperture 0.43mm, wire diameter 0.075mm, 50x50 wires/inch, open area 72%, plain weave mesh

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Tantalum, foil, 8mm disks, thickness 0.006mm, 99.9%

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Tantalum, foil, 6mm disks, thickness 0.0075mm, 99.9%

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Tantalum, foil, 4mm disks, thickness 0.5mm, annealed, 99.9%

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Tantalum, foil, light tested, 150x300mm, thickness 0.075mm, annealed, 99.9%

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Tantalum, foil, 8mm disks, thickness 0.25mm, annealed, 99.99%

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Tantalum, foil, 6mm disks, thickness 0.5mm, annealed, 99.9%

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Tantalum, foil, light tested, 150x150mm, thickness 0.03mm, as rolled, 99.9%

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Tantalum, tube, 1000mm, outside diameter 3.0mm, inside diameter 2mm, wall thickness 0.5mm, as drawn, 99.9%

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Tantalum, foil, light tested, 25x25mm, thickness 0.003mm, 99.9%

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Tantalum, rod, 500mm, diameter 2.0mm, annealed, 99.9%

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Tantalum, rod, 200mm, diameter 1.5mm, annealed, 99.9%

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Tantalum, foil, not light tested, 100x100mm, thickness 0.009mm, 99.9%