The present invention relates to an implant consisting of a surface layer consisting of fibres and a matrix, having a first surface and a second surface opposite each other, and having a thickness that is at most 5% of the largest dimension of said surface layer； a porous biodegradable part having a first surface and a second surface opposite each other, wherein its first surface is attached to the second surface of the surface layer and having a thickness of 1-8 mm； and a membrane layer made of collage having a first surface and a second surface opposite each other, wherein its first surface is attached to the second surface of the porous part without covering the edges of the porous part； wherein its first surface is attached to the second surface of the porous part wherein the porous part comprises material selected from the group consisting of bioactive glass, bioactive ceramic, hydroxyapatite, tricalciumphosphate and mixtures thereof.
