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

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

692824

Sigma-Aldrich

Tantalum, powder, 60-100 mesh, 99.9%

GF97180870

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

GF86342485

Tantalum, foil, 100x100mm, thickness 0.20mm, annealed, 99.9%

GF03595305

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

GF69076839

Tantalum, foil, light tested, 50x50mm, thickness 0.034mm, as rolled, 99.9%

GF04828765

Tantalum, foil, 8mm disks, thickness 0.0075mm, 99.9%

GF42443984

Tantalum, foil, not light tested, 100x100mm, thickness 0.01mm, 99.9%

GF27272167

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

GF66499891

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

GF83507238

Tantalum, foil, light tested, 100x100mm, thickness 0.03mm, as rolled, 99.9%

GF42889517

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

GF38737929

Tantalum, pellets, 20g, max. size 10mm, 99.9%

GF52742099

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

GF55545149

Tantalum, foil, light tested, 25x25mm, thickness 0.02mm, 99.9%

GF84918381

Tantalum, foil, 50mm disks, thickness 0.034mm, as rolled, 99.9%

GF33704142

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

GF84327510

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

GF19254472

Tantalum, foil, not light tested, 25x25mm, thickness 0.0005mm, 99.9%

GF18330780

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

GF40838632

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

GF01901539

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

GF93289090

Tantalum, foil, light tested, 25x25mm, thickness 0.004mm, 99.9%

GF48352798

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

GF02019956

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

GF26536057

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

GF45711806

Tantalum, tube, 1000mm, outside diameter 2.1mm, inside diameter 1.6mm, wall thickness 0.25mm, as drawn, 99.9%

GF53850371

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

GF64866202

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