Anatomical measurements of the calcar stem hemiarthroplasty side and intact side values. Anatomical measurements were evaluated by calculating the difference between the calcar stem hemiarthroplasty side and intact side values. The femoral neck offset difference is the horizontal distance between the hip rotation center and the femoral shaft anatomical axle difference between the prosthetic side and the intact side (yellow lines: x-x1). The femoral vertical offset difference was measured as the vertical distance between the center of the femoral head and the trochanter minor between the prosthetic side and intact side (pink lines: y-y1). The head-neck angle difference is the difference between the partial prosthesis and the stem (red lines: a-a1). The center edge angle of the Wiberg angle is the perpendicular line drawn to the center of the head and the lateral corner of the acetabulum roof difference between the prosthetic side and the intact side (blue lines: b-b1). The distance between the trochanter major and the lateral corner of the acetabulum roof difference between the prosthetic side and the intact side (green line: z-z1).