The stem for an artificial hip joint according to the present invention has a structure in which the distance between the inner wall portion and the outer wall portion decreases as the inner wall portion and the outer wall portion are separated from the opening in a sectional view including the inner wall portion and the outer wall portion in parallel with the stem central axis, In a cross-sectional view parallel to the stem central axis and including the front wall portion and the rear wall portion, both the front wall portion and the rear wall portion have a flat region. The stem inserter of the present invention has a disk-shaped tip portion. An artificial hip joint system including these artificial hip joint stem and stem inserter and an artificial hip joint comprising a stem for artificial hip joint are provided.本発明の人工股関節用ステムは、ステム中心軸に平行であり内壁部および外壁部を含む断面視において、内壁部および外壁部が、開口部から離れるにつれて互いの間の距離が小さくなっており、ステム中心軸に平行であり前壁部および後壁部を含む断面視において、前壁部および後壁部がいずれも、平坦状の領域を有する。本発明のステムインサーターは、円盤状の先端部を備える。これら人工股関節用ステムおよびステムインサーターを備える人工股関節システムと、人工股関節用ステムを備える人工股関節とを提供する。
