An acetabular cup for use in a hip arthroplasty, the cup comprising: a first wall (12) having an external surface (16), an internal surface (18) and an edge (20) that couples the two surfaces, and a second wall (14) extending from the external surface of the first wall, the second wall having an external surface (22), an internal surface (24) and an edge (26) that couples the two surfaces, the endowment being provided second wall of a plurality of flanges (30) extending outwardly arranged around the first wall, in which adjacent flanges are separated by grooves (32) that are cut in the second wall and extend from the edge (26) of the second wall aligned with the longitudinal axis of the cup, in which the edge of the second wall is separated outwardly from the edge of the first wall and each of the tabs of the second wall is separated from the first wall by med io of a recess (28), allowing the recesses and the grooves to flex the tabs of the second wall when the cup is inserted in a prepared acetabulum, characterized in that the edge of the second wall is separated outwardly from the edge of the First wall around the entire periphery of the first wall.Una copa acetabular para ser utilizada en una artroplastia de cadera, comprendiendo la copa: una primera pared (12) que tiene una superficie externa (16), una superficie interna (18) y un borde (20) que acopla las dos superficies, y una segunda pared (14) que se extiende desde la superficie externa de la primera pared, teniendo la segunda pared una superficie externa (22), una superficie interna (24) y un borde (26) que acopla las dos superficies, estando dotada la segunda pared de una pluralidad de pestañas (30) que se extienden hacia fuera que están dispuestas en torno a la primera pared, en la que las pestañas adyacentes están separadas por ranuras (32) que están cortadas en la segunda pared y se extienden desde el borde (26) de la segunda pared alineada con el eje longitudinal de la copa, en la que el borde de la s
