Surgical technique and instrumentation for minimal incision hip arthroplasty surgery

An instrument (100, 200) of a device for changing the shape of a proximal femur of a patient for installation of a stem of a femoral component of a prosthetic hip during surgery hip replacement, comprising: a handle ( 100, 200) including an elongated shaft (102A, 202A) extending downward approximately in a z-direction; characterized in that the device comprises a first offset (104, 204) extending from a bottom of the elongated shaft approximately in a direction and; one second offset (105, 205) extending from the first offset approximately in an x-direction; and a shaping member (101, 201) elongated downward from the second offset approximately in the z direction.