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(A) The alpha angle is measured by applying a circular template to match the diameter of the femur. A line is drawn along the longitudinal axis of the femoral neck. A second line is drawn from the center of the circular template to the point where the femoral head deviates from the circular template. The angle subtended by these lines forms the alpha angle. (B) Example of improved alpha angle after recontouring of the femoral head-neck junction is shown.
