The invention relates to a method for preparing an osteomimetic material from which an endosseous implant for médical or veterinary use is made, said method including the steps of: i . preparing (210) a homogeneous mixture consisting of a biocompatible thermoplastic polymer and beta-tricalcium phosphate (bTOR), ii. Subjecting said mixture to an injection or extrusion molding opération (220) on a screw machine, at an injection température at least equal to the fusion température of said polymer and at a pressure of between 70 MPa and 140 Mpa so as to convert said tricalcium phosphat into a non-stoichiometric calcium apatite 3(Ca3(P04)2)(OH)2Ca similar to that of bone. The invention also relates to a material prepared by such a method and to an endosseous implant made of said material.