Subscribe

Basion-Dental Interval (BDI) and Basion-Posterior Axial Line Interval (BAI) of Harris for Evaluating a Patient with a High Cervical Spine Injury (Rule of Twelves)

Specialty:

Orthopedic Surgery
Emergency Medicine
Critical Care
General Surgery
Otolaryngology

Objective:

ICD-10:

Description:

Harris et al identified 2 measurements from a lateral cervical spine radiograph which can help determine if the patient has an occipitocervical (occipitoatlantal) dissociation. Because 12 mm is used as the upper limit of normal, these are termed the "rule of twelves."

To read more or access our algorithms and calculators, please log in or register.

RECENT TWEETS

medal descover
medal iphone