An implantable device for repairing or replacing a knee meniscus of a human or animal patient in need thereof, comprising: a biocompatible non-resorbable three-dimensional body, comprising: a central body having a substantially crescent shape and comprising a top surface and a bottom surface integrally connected, separated, and reinforced by a first plurality of vertical elements, and a minor arc and a major arc defined by the first plurality of vertical elements and the top surface and the bottom surface; a second structure having a substantially crescent shape conforming to and proximal to the minor arc of the central body, the second structure comprising a first surface and a second surface integrally connected, separated, and reinforced by a second plurality of vertical elements, and the first surface and the second surface form an inner edge distal from the minor arc of the central body; and a third structure conforming to and proximal to the major arc of the central body, substantially circumferentially surrounding the central body, further comprising a first extension and a second extension adapted to attach the implantable device in the human or animal patient; characterised by a surface coating comprising a lubricious substance covering at least a portion of the three-dimensional body, wherein the surface coating comprises a reinforced lubricious coating comprising a fiber-reinforced matrix. a biocompatible non-resorbable three-dimensional body, comprising: a central body having a substantially crescent shape and comprising a top surface and a bottom surface integrally connected, separated, and reinforced by a first plurality of vertical elements, and a minor arc and a major arc defined by the first plurality of vertical elements and the top surface and the bottom surface; a second structure having a substantially crescent shape conforming to and proximal to the minor arc of the central body, the second structure comprising a first surface and a second surface integrally connected, separated, and reinforced by a second plurality of vertical elements, and the first surface and the second surface form an inner edge distal from the minor arc of the central body; and a third structure conforming to and proximal to the major arc of the central body, substantially circumferentially surrounding the central body, further comprising a first extension and a second extension adapted to attach the implantable device in the human or animal patient; characterised by a central body having a substantially crescent shape and comprising a top surface and a bottom surface integrally connected, separated, and reinforced by a first plurality of vertical elements, and a minor arc and a major arc defined by the first plurality of vertical elements and the top surface and the bottom surface; a second structure having a substantially crescent shape conforming to and proximal to the minor arc of the central body, the second structure comprising a first surface and a second surface integrally connected, separated, and reinforced by a second plurality of vertical elements, and the first surface and the second surface form an inner edge distal from the minor arc of the central body; and a third structure conforming to and proximal to the major arc of the central body, substantially circumferentially surrounding the central body, further comprising a first extension and a second extension adapted to attach the implantable device in the human or animal patient; characterised by a surface coating comprising a lubricious substance covering at least a portion of the three-dimensional body, wherein the surface coating comprises a reinforced lubricious coating comprising a fiber-reinforced matrix.