The invention relates to a resorptive intramedullaryimplant between two bones or two bone fragments. Theimplant includes a single-piece body (1) having a generallyelongate shape and having, at each end, areas for anchoringto the bone portions in question, characterized in that oneof said areas (A1) has a cylindrical cross-section whilethe other area (A2) has a flat cross-section.