- ADI in Adults:
- in flexion, ADI should be less than 3 mm;
- ADI in Children:
- in flexion, ADI should be less than 3.5 mm;
- Diff Dx of ADI Wideing:
-
Jefferson's Fracture:
-
Atlanto Axial Rotatory Fixation:
-
Atlanto Axial Subluxation:
-
Down's Syndrome:
-
Rheumatoid Arthritis:
-
Transverse Ligament
- an anterior shift of C1 on C2 of more than 3-5 mm implies injury to
transverse ligament;
- shift > 5 mm implies injury transverse & alar ligaments;
