Abstract: The invention relates to a cement-free hip endoprosthesis for the femur (1), comprising a shaft (2) which can be inserted into the femur (1) and has a curvature, and comprising at least approximately parallel or concentric grooves (3) or ribs (4) along the shaft surface, the proximal end (5) of the shaft (2) being formed without a collar, and the groove base in the proximal region (6) running out in a shoulder-shape for at least a part of the groove (3b), resulting in a good seat in combination with a short design length.