A greater anterior atlantodental interval (AADI), however, requires damage to the alar and apical ligaments, potentially combined with changes of the bony shape of the dens axis (Figure 1) .
Previous investigations declared that the posterior atlantodental interval (PADI), depicting the distance between the posterior surface of the odontoid and the anterior margin of the posterior ring of the atlas, which regularly measures 19-27 mm, is diagnostically more conclusive regarding the risk of spinal cord compression and resulting neurological disorders [4,16, 17].
Anterior Atlantodental Interval. The AADI in intact specimen measured 1.62 mm [+ or -] 0.62 on average.
Posterior Atlantodental Interval. The extent of the PADI in intact specimen ranged from 17.57 mm minimally to 20.86 mm maximally in neutral position of the cervical spine, averaging 18.85 mm [+ or -] 1.25.