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

357251

Sigma-Aldrich

Tantalum, foil, thickness 0.5 mm, ≥99.9% trace metals basis

545007

Sigma-Aldrich

Tantalum, powder, 99.99% trace metals basis

262919

Sigma-Aldrich

Tantalum, foil, thickness 0.025 mm, ≥99.9% trace metals basis

262889

Sigma-Aldrich

Tantalum, foil, thickness 1.0 mm, ≥99.9% trace metals basis

262862

Sigma-Aldrich

Tantalum, wire, diam. 1.0 mm, ≥99.9% trace metals basis

262897

Sigma-Aldrich

Tantalum, foil, thickness 0.25 mm, ≥99.9% trace metals basis

GF44780823

Tantalum, foil, not light tested, 50x50mm, thickness 0.004mm, 99.9%

GF48485470

Tantalum, foil, not light tested, 100x100mm, thickness 0.0025mm, 99.9%

GF80500441

Tantalum, foil, light tested, 50x50mm, thickness 0.009mm, 99.9%

GF80569233

Tantalum, foil, light tested, 25x25mm, thickness 0.005mm, 99.9%

GF60826417

Tantalum, foil, 10mm disks, thickness 0.02mm, 99.9%

GF14575596

Tantalum, foil, 10m coil, thickness 0.04mm, coil width 0.7mm, annealed, 99.9%

GF66145260

Tantalum, foil, 100x100mm, thickness 0.5mm, annealed, polished on both sides, 99.9%

GF59916673

Tantalum, foil, 10m coil, thickness 0.04mm, coil width 1mm, annealed, 99.9%

GF91348308

Tantalum, foil, 10mm disks, thickness 0.006mm, 99.9%

GF37205546

Tantalum, foil, 10mm disks, thickness 0.034mm, as rolled, 99.9%

GF54849055

Tantalum, wire reel, 20m, diameter 0.025mm, as drawn, 99.9%

GF65395031

Tantalum, tube, 100mm, outside diameter 2.0mm, inside diameter 1mm, wall thickness 0.5mm, as drawn, 99.9%

GF31333137

Tantalum, sphere, 100pcs, diameter 1.0mm, precision sphere grade, 99.9%

GF51294168

Tantalum, tube, 1000mm, outside diameter 0.51mm, inside diameter 0.21mm, wall thickness 0.15mm, as drawn, 99.9%

GF55895158

Tantalum, wire reel, 50m, diameter 0.125mm, annealed, 99.9%

GF53967257

Tantalum, wire reel, 10m, diameter 0.5mm, annealed, 99.9%

GF33986087

Tantalum, wire reel, 0.5m, diameter 0.8mm, annealed, 99.9%

GF89000119

Tantalum, tube, 200mm, outside diameter 2.0mm, inside diameter 1.4mm, wall thickness 0.3mm, as drawn, 99.9%

GF33605681

Tantalum, tube, 100mm, outside diameter 6.35mm, inside diameter 4.35mm, wall thickness 1mm, as drawn, 99.9%

GF19351289

Tantalum, foil, not light tested, 25x25mm, thickness 0.005mm, 99.9%

GF25014888

Tantalum, tube, 500mm, outside diameter 2.0mm, inside diameter 1.4mm, wall thickness 0.3mm, as drawn, 99.9%

GF82893695

Tantalum, wire reel, 50m, diameter 0.25mm, annealed, 99.9%

GF61599998

Tantalum, rod, 1000mm, diameter 2.0mm, annealed, 99.9%

GF04010847

Tantalum, rod, 100mm, diameter 18mm, annealed, 99.9%