The (anterior) atlantodental interval is defined as the distance between the anterior margin of the dens of the axis and the nearest point of the anterior arch of the atlas on a lateral X-ray of the cervical spine1.
Imaging
Normal values
| Patient population | ADI2 |
|---|---|
| Adult men | ≤ 3 mm |
| Adult women | ≤ 2,5 mm |
| Pediatric (≤ 15 years) | ≤ 4mm |
Clinical relevance
A pathologically widened atlantodental interval may be an indirect indication of rupture of the Ligamentum transversum atlantis.
References