Implantable component with improved anchoring means for ankle prosthesis and ankle prosthesis comprising such a component

An implantable ankle-prosthesis device, comprising:

• a tibial component comprising a main body provided with a bone contact face configured to come in contact with an area of a bone body of an ankle that extends along a median contact plane;
• at least one projection that protrudes from the bone contact face to anchor the tibial component into the bone body;
• the projection comprising two pairs of anchoring wings which each extend in a plane, respectively, orthogonal to the median contact plane of the bone contact face between a first end connected to the bone contact face and an opposite second end;
• wherein the pairs of anchoring wings comprise a first width in an anteroposterior direction of extension that is larger than a second width in a lateromedial extension;
• the respective planes of extension of the pairs of anchoring wings intersecting each other;
• wherein the bone contact face of the tibial component is configured to come in contact with an area of a distal end of a tibia;
• wherein the intersecting planes of extension of the anchoring wings are configured to permit insertion of the tibial component by impaction while preventing translational or rotational movement of the main body relative to the tibia;
• the tibial component comprising a first fastening element that is complementary to a second fastening element carried by an intermediate component;
• wherein the second ends of the pairs of anchoring wings are inscribed in a leading plane that is inclined with respect to the median contact plane along a downslope from an anterior edge to posterior edge of the bone contact face;
• and
• wherein the wings of each of said pairs of wings of the projection are provided with lateral external edges that extend in an inclined, oblique, manner with respect to the median contact plane, along one or more median directions that intersect at intersection points located beyond the median contact plane and the leading plane, such that the lateral external edges of the wings of a same pair of wings are not parallel.