Prosthetic element including a metal cap having inside an acetabular seating and method to make it. At least part of the cap is a lattice having open and intercommunicating cavities. At least part of the lattice is formed, without a continuity break, by geometric meshes of polygonal shape repeated in space over all or part of the body, having a cellular geometry with elementary cells open and contiguous, to define a plurality of polygons with spatial development delimiting the cavities. Each geometric mesh has a first polygonal part with four sides, each of the sides being an angled segment, and a second part being an angled segment and a third part being an angled segment. Each angled segment has first and second consecutive rectilinear segments forming an angle at an intersection of each pair of its first and the second consecutive segments. The first polygonal part has non co-planar vertexes.