The present invention relates to a hip prosthesis femoral stem (100) comprising (i) a prosthetic femoral neck (110) portion for replacing a resected femoral neck (200) and having a femoral head thereof, and having a femoral head center (115) to be the center of the connection between said femoral neck portion (110) and a femoral head, (ii) and an elongate intramedullary portion (120) for introduction in the medullary cavity (201) of the femur (200), the intramedullary portion (120) having a diaphyseal distal portion (121) and a metaphyseal proximal portion (122), the intramedullary portion (120) and the portion forming a femoral neck (110) being connected by an inclined substantially flat interface area (112), the femoral stem (100) further having a longitudinal plane (P). The intramedullary portion (120) that has been defined above has a normal section (125) to said longitudinal plane of symmetry (P), being at a distance of between 35 and 80 millimeters from the femoral head center (115) in a orthogonal projection, having a substantially isosceles trapezoidal geometry, which comprises a small base (125b), a large base (125a) and two convergent sides (125c-125d) of constant angle (α) with respect to said longitudinal plane (P), and wherein the small base (125b) is in a medial area of the intramedullary portion (120) of the femoral stem (100). La présente invention concerne un tige fémorale (100) pour prothèse de hanche comportant (i) une partie formant un col fémoral (110) prothétique, destinée à remplacer un col de fémur reséqué (200) et à être équipée d'une tête fémorale, et présentant un centre de tête fémorale (115) destiné à être le centre de la liaison entre ladite partie formant un col fémoral (110) et une tête fémorale, (ii) et une partie intramédullaire (120) de forme allongée destinée à être introduite dans la cavité médullaire (201) du fémur (200), la partie intra-médullaire (120) comportant une partie distale diaphysaire (121) et une partie pro
