File:Fielding and Hawkins classification of atlantoaxial rotatory subluxation (Radiopaedia 42320).jpg

Summary:

• Radiopaedia case ID: 42320
• Image ID: 18877460
• Study findings: Fielding and Hawkins classified atlantoaxial rotatory subluxation into 4 types:
• Modality: Diagram
• System: Spine
• Findings: Fielding and Hawkins classified atlantoaxial rotatory subluxation into 4 types:

Type I: Simple rotatory displacement without anterior shift. The transverse ligament is intact and the dens acts as a pivot point. Type II: Rotatory and anterior displacement between 3-5 mm. The transverse ligament is injured and the opposite facet acts as the pivot point. Type III: Rotatory and anterior displacement greater than 5 mm with both lateral atlantoaxial joints anteriorly subluxed. The transverse ligament and facet capsules are injured. Type IV: Posterior subluxation of both lateral atlantoaxial joints. Rare and described in adult patients with rheumatoid arthritis and destruction of the dens.

• Published: 15th Jan 2016
• Source: https://radiopaedia.org/cases/fielding-and-hawkins-classification-of-atlantoaxial-rotatory-subluxation
• Author: Behrang Amini
• Permission: http://creativecommons.org/licenses/by-nc-sa/3.0/

Licensing:

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)

This file is ineligible for copyright and therefore in the public domain, because it is a technical image created as part of a standard medical diagnostic procedure. No creative element rising above the threshold of originality was involved in its production.