New instruments for the removal of an artificial hip joint from the shaft

Two new instruments for the removal of intact of broken stems of artificial hip joints are described. The instruments and their application are illustrated in the figures 1-4. They produce a force along the longitudinal direction of the femur which breaks the metal to bone-cement bond. The use of these instruments reduces problems which may arise from fracture of the cortical bone of the femoral shaft or from an impairment of sterility.