Fig. 5From: Acetabular- and femoral orientation after periacetabular osteotomy as a predictor for outcome and osteoarthritisAlpha Angle. Measurement of the alpha angle in a calculated radial sequence using the femoral head center and the femoral neck bisecting line in coronar and axial plane: a exemplary with description of all 7 alpha angles (9/10/11/12/13/14/15 o’clock) b 9 and 15 o’clock and c 12 o’clockBack to article page