- 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
Intraobserver reproducibility and interobserver reliability of cervical spine measurements.