An implant to be fastened to a tissue, a tool and a kit. The implant (1) has a first end (5), a second end (6) and an elongated shank (8) made at least partly of a first polymer material. The implant (1) comprises a contact surface for receiving external mechanical energy for deforming the shape of the implant (1) such that the shape of the implant (1) can be deformed and locked in the tissue by the effect of said mechanical energy.