A blade-like stem of a hip joint prosthesis for anchoring in the femur, including a portion comprising a prosthesis neck on the one hand and a femur-anchoring portion tapering towards a distal end on the other hand, the lateral narrow side of which comprises a distal straight portion and a proximal arcuate portion, the straight portion extending over a length of from 60% to 75% of the total length of the stem.
