Embodiments are directed to moulded article, provided with granules made of a bio-compatible material, which granules have a substantially porous structure and are interconnected, forming a rigid or semi-rigid structure; a mass for forming such a moulded article; and a method for forming a moulded article, comprising the steps of providing a mass comprising at least granules made of a bio-compatible material and having a porous structure, and pressing said mass, especially said granules together, for forming a rigid or semi-rigid structure.