Abstract: An endoprosthesis of the hip joint, comprising a head (1) insertable into the cotyloid cavity, and a pin (2) insertable into the medullary canal of the femoral bone. The pin (2) has in its top portion a through hole (3) for a U-clamp (4) to pass through, which U-clamp is secured in the hole (3) by means of a stud (5), both of the abovementioned U-clamp and stud being made of a biologically destructible polymer material. The middle portion of the pin (2) has at least two longitudinal slots (6), wherein combined movable inserts (7) are fitted, while the portion of the inserts that adjoins the bone surface is made of a biologically destructible polymer material. The bottom portion of the pin (2) is provided with a cap (8) made of a biologically indifferent polymer material.