the invention relates to implants , for use in human and in veterinary medicine . the novel implants form , after implantation , an integral structure with the surrounding tissues . the implants consist of a rigid core which is coated with a well adhering matrix , in which there are embedded collagen fibers , part of which protrude from the surface of said matrix . a wide variety of solid physiologically acceptable materials can be used . the matrix may optionally contain additives , such as fibronectin , platelet derived growth factor , bone morphogenic proteins , growth factors , vitamin d or hormones , or a combination of any of these .