A self-supporting prosthesis, in particular for plastic and reconstructive surgery, comprising a body (100) provided with a main portion (101) suitable to reshape or fill the area of the body of the patient in which the prosthesis is intended to be implanted. The self-supporting prosthesis is characterised in that the body (100) comprises a fixing portion (120) suitable to allow fixing directly on the muscle tissue of the area of implantation.
