Review
Copyright ©2013 Baishideng Publishing Group Co.
World J Orthop. Apr 18, 2013; 4(2): 32-41
Published online Apr 18, 2013. doi: 10.5312/wjo.v4.i2.32
Table 1 The Graf classification[11]
Graf typeAngles
All type IAlpha angle > 60 degrees (normal)
Type IaBeta angle < 55 degrees
Type IbBeta angle > 55 degrees
All type II
Type IIaAlpha angle 50-59 degrees
Type IIbAlpha angle 50-59 degrees
Type IIcAlpha angle 43-49 degrees
Beta angle < 77 degrees
Type D ("about to decenter")Alpha angle 43-49 degrees
Beta angle > 77 degrees
Type IIIAlpha angle < 43 degrees
Type IIIa and IIIb distinguished on the grounds of structural alteration of the cartilaginous roof
Type IV (dislocated with labrum interposed between femoral head and acetabulum)Alpha angle < 43 degrees