Posttraumatic Atlantoaxial Rotatory Dislocation in a Healthy Adult Patient: A Case Report and Review of the Literature

Table 1

Classification of AARD by Fielding and Hawkins [6].

Type	Injury of transverse ligament	ADI
Type I	None	<3 mm
Type II	Mild	3–5 mm
Type III	Deficiency both of the transverse and alar ligaments	>5 mm
Type IV	Deficiency both of the transverse and alar ligaments	Posterior shift of the atlas

*Adapted by Kim et al., 2007 [34].