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%

GF91998253

Tantalum, foil, light tested, 100x100mm, thickness 0.025mm, as rolled, 99.9%

GF72299829

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

GF97782452

Tantalum, rod, 100mm, diameter 2.0mm, annealed, 99.9%

GF84004231

Tantalum, tube, 100mm, outside diameter 7.0mm, inside diameter 6.7mm, wall thickness 0.15mm, as drawn, 99.9%

GF93289090

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

GF69076839

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

GF66426431

Tantalum, tube, 100mm, outside diameter 12.7mm, inside diameter 11.7mm, wall thickness 0.5mm, annealed, 99.9%

GF73528296

Tantalum, tube, 1000mm, outside diameter 3.5mm, inside diameter 3.1mm, wall thickness 0.2mm, as drawn, 99.9%

GF99532592

Tantalum, tube, 100mm, outside diameter 8.7mm, inside diameter 8.34mm, wall thickness 0.18mm, as drawn, 99.9%

GF92754490

Tantalum, tube, 500mm, outside diameter 1.05mm, inside diameter 0.65mm, wall thickness 0.2mm, as drawn, 99.9%

GF87514421

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

GF74379684

Tantalum, tube, 200mm, outside diameter 2.0mm, inside diameter 1mm, wall thickness 0.5mm, as drawn, 99.9%

GF93583378

Tantalum, rod, 25mm, diameter 18mm, annealed, 99.9%

GF84233976

Tantalum, wire reel, 10m, diameter 0.125mm, annealed, 99.9%

GF72208975

Tantalum, wire reel, 2m, diameter 0.8mm, annealed, 99.9%

GF71338990

Tantalum, tube, 200mm, outside diameter 1.02mm, inside diameter 0.86mm, wall thickness 0.08mm, as drawn, 99.9%

GF99542368

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

GF96511091

Tantalum, foil, 25x25mm, thickness 0.15mm, annealed, 99.9%

GF84642206

Tantalum, foil, 50x50mm, thickness 0.125mm, annealed, 99.9%

GF98838444

Tantalum, foil, 100x100mm, thickness 1.5mm, annealed, 99.9%

GF69110759

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

GF86342485

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

GF66812564

Tantalum, foil, 150x150mm, thickness 0.100mm, annealed, 99.9%

GF84482387

Tantalum, foil, 50x50mm, thickness 0.25mm, annealed, 99.9%

GF76534500

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

GF86596677

Tantalum, foil, 0.5m coil, thickness 0.1mm, coil width .62mm, as rolled, 99.9%