01/20/2026
Basion Dens Interval (BDI)
Basion-Dens Interval (BDI) and the Basion-Axis Interval (BAI)—two radiological metrics that, when interpreted together with clinical findings and additional imaging, offer greater insight into craniocervical stability. Understanding Basion-Dens Interval (BDI) The Basion-Dens Interval (BDI) is an important radiological measurement used to assess vertical instability or cranial settling at the craniocervical junction (CCJ). BDI quantifies the vertical separation between the Basion and the odontoid tip....
Basion-Dens Interval (BDI) and the Basion-Axis Interval (BAI)—two radiological metrics that, when interpreted together with clinical findings and additional imaging, offer greater insight into cran…