A medical device for the treatment of osteoarthritis of the hip joint contributing to the injection of an artificial surface of the hip joint on the natural surface of the hip joint or on a natural surface of the hip joint surgically modified, wherein said medical device comprises a first closure element (84) adapted to be placed in the hip joint to create a hollow space together with the acetabulum, or an artificial replacement thereof, and the head of the femur, or an artificial replacement (45) thereof, wherein said first closing element has an elongated body adapted to close said hollow space confined by the surfaces of the acetabulum, or of an artificial replacement thereof, and of the head of the femur, or of an artificial replacement thereof, in order to receive, within said hollow space, a material (93) for r covering at least one of the acetabulum and the head of the femur, wherein said medical device further comprises a second closure element (86), wherein - said first and second closure elements define a closed hollow space (87) together with the head of the femur, or an artificial replacement thereof, and the acetabulum, or an artificial replacement thereof, and - said first and second closure elements are adapted to make contact with said material when said hollow space receives said material to cover at least one of the surface of the acetabulum and the surface of the head of the femur, and in which the device comprises said material, characterized in that said material is biocompatible and is adapted to be injected such that it is brought into contact with said first closure element, and wherein said biocompatible material is adapted to be transformed from a fluid state to a solid state after said material has been injected into said provisional mold, and wherein said material is adapted to have a surface that tolerates wear and pressure when said material is in said solid state.Un dispositivo médico para el tratamiento de la osteoartritis de la artic
