To propose a custom-made stem having the shape which displays high Fit and Fill by reflecting a personal figure characteristic of the femur on the computer calculation. A model is made from the femur to take surgical treatment, which does not need much time to calculate in spite of the fact that it complies with the characteristic of shape of the femur, particularly with the personal difference in the curvature thereof, which usually complicates the calculation. The several models are made which can be implanted in a deep hollow by calculating in the reverse course that the stem is pulled out of the deep hollow, to show some reliable models of these to a surgeon. With figuring out the movement peculiar to the stem for of the patient, an improved stem is made in a short time which meets demands of the surgeon. The stem, which is custom-made, can be confirmed beforehand that it agrees with the femur of the patient.
