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The femoral axis and coordinate axis used for measurement are shown. In the mediolateral view of the femur, the anterior border of the greater trochanter parallel to the proximal femoral axis was defined as the Y-axis and its perpendicular axis at the saddle level was defined as the X-axis. (A) An AP view of the right femur is shown on the left and a mediolateral view is shown on the right. (B) The coordinate axis for measurement of tendon attachment is shown.
