The invention relates to a method for treating an implant surface intended for implantation into bone tissue wherein a microroughness comprising pores and peaks having a pore diameter of .ltoreq.1 .mu.m, a pore depth of .ltoreq.500 nm, and a peak width, at half the pore depth, of from 15 to 150% of the pore diameter is provided. The invention also relates to an implant comprising a surface having the above characteristics.