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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, Sports Medicine & Rehabilitation
Emergency Medicine & Critical Care
Emergency Medicine & Critical Care
General Surgery & Anesthesiology
Neurology, Psychiatry, Ophthalmology & 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."

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