Patent ID: 7901462

Claim:
A chromium containing biomedical implant, comprising: a chromium containing metallic substrate including a textured surface with a plurality of indentations comprising depths in a range up to about 2.4 micrometers, the textured surface comprising a plurality of metallic elements and adhering on a surface of the metallic substrate to form a porous surface, the plurality of indentations being distributed on the plurality of metallic elements and the surface of the metallic substrate, wherein the plurality of indentations is produced by an etching solution comprising: an acid selected from the group consisting of a hydrogen halide acid, and a mixture of a hydrogen halide acid and an oxyacid, wherein the hydrogen halide acid has a concentration in the range of about 1M to 12M, and the oxyacid has a concentration range of about 0.01M to 14M; a chlorine containing compound at a concentration in the range of about 0.01M to 2M; and an oxidant at a concentration in the range of about 0.01M to 10M, the etching solution being free of hydrogen fluoride, the plurality of indentations having diameters in the range of about 200 nanometers to 15 micrometers.