Method for surface treatment of a bio-compatible metal material and implant treated by said method

A biocompatible metal implant comprising:

• at least one treated surface, said treated surface subject to abrasive mechanical treatment of the surface of said material by means of abrasive grains based on calcium phosphate;
• said treated surface subject to acid treatment by soaking, at a temperature above 40° C., said material in a bath comprising sulfuric acid and hydrochloric acid, followed by at least one rinse with demineralized water;
• and
• said treated surface subject to sodium treatment by soaking, at a temperature above 40° C., said material in a sodium hydroxide-based bath having only sodium hydroxide, followed by at least one rinse with demineralized water and by hot air drying,
• wherein said biocampatible metal implant treated surface has a macroporosity in the form of cells having dimensions of the order of 50 μm to 250 μm, said cells comprising pores of from 1 μm to 50 μm, and pores with a size of less than a micrometer, homogeneously over the whole of the treated surface, said treated surface having a surface roughness Ra of greater than or equal to 1.90 μm.