The invention relates to a hip prosthesis comprising a joint part (6) and an anchoring part (5) to be implanted in the neck (2) of the femur (1). According to the invention, the anchoring part (5) can be deformed in a manner that corresponds with load-associated deformations of the femur (1) in the area of the neck (2). The anchoring part is preferably formed from a number of parts consisting of parts (9, 10), which can move relative to one another and which are positively interconnected in a direction perpendicular to the longitudinal axis (4) of the femoral neck.