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The femoral head is spherically fitted, and the center of the sphere is used as the center of the femoral head. The plane in which the center of the lesser trochanter is located is used as the osteotomy plane, and the proximal femoral varus is performed according to preoperative planning. The distance from the center of the femoral head to the osteotomy plane is the distance of the proximal femur after osteotomy
