The invention relates to a femoral stem (1) for a hip prosthesis comprising a central body (2) having a substantially conical longitudinal profile which is axially inserted in an excavation (7) realized in the straight body of the femoral bone (8) and which is provided with a lateral body (3) supplied of an appendix suited to receive a spherical element which is coupled with a cap placed in the hip. The central body (2) presents a plurality of longitudinal finnings (6) which go along its whole length where said finnings are joined at the base by curved surfaces (61, 62) having a transversal concave profile in order to define a plurality of longitudinal grooves (63) convergent towards the tip (21) of the central body. IMAGE
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