A major mechanical problem with total hip replacement is the loosening of the femoral component. Loss of proximal support, with firm fixation distally, has been thought to be a major caused of fatigue failure of femoral stems. While many causes have been proposed, the most frequently suggested cause of the calcar resorption is the disuse atrophy of the cortex of the calcar due to the stress shielding of the proximal bone by the metal femoral stem. The purpose of this study is to evaluate the new type stem which made a hole through the collar. This stem is thought to be decreased the stress-shielding and made a effective load transfer at the calcar region. Evaluation method was the 3 dimensional finite element method and the cadaveric femur study using strain gauge. Results were as follows: l. In finite element study, the stress concentration around the calcar was 1077.8 u e in case of modified collar stem compared to 477.2 u e in case of common collar stem. 2. In cadaveric femur study, the stress concentration around the calcar was 1265 u e in case of modified collar stem compared to 760 u e in case of common collar stem. 3. In case of modified collar stem, the stress concentration around the calcar was approached to normal phyiologic value. 4. Von missed cement stress around calcar was increased in case of modified collar stem, but it was thought a minor problem. Modified collar stem was very effective method which was applied to cemented femoral component and was thought of be effective also at cementless femoral component.