Fig. 1From: Automated measurement of alpha angle on 3D-magnetic resonance imaging in femoroacetabular impingement hips: a pilot studyManual alpha angle measurement. ‘hc’ = center of the femoral head. ‘nc’ = center of the femoral neck located at the neck's most narrowed point. ‘A’ = point where the distance from the bone to the center of the femoral head exceeds the radius of the best-fit circle around the femoral headBack to article page