"The fracture will not be seen as well as with CT. However, localised soft-tissue injury will be apparent. Pre-vertebral haemorrhage or oedema will identify injury at the level of C1/2. A ligamentous injury will also be demonstrated. A fat-sat T2 sequence is useful in the trauma setting to help distinguish abnormal soft-tissue injury from normal fat."
"pseudo-Jefferson fracture, or pseudospread of the atlas on the axis"
"The classification is named after Sir Geoffrey Jefferson (1886-1961) 16, a British neurosurgeon who first described the anatomic sites of fracture in a case series and literature review in 1919 4."
"AO Spine classification of upper cervical injuries"
"In cases where the ligament is thought to be disrupted, the injury is considered unstable and more aggressive management is usually required 7. This includes halo immobilisation, posterior C1-C2 lateral mass internal fixation or transoral internal fixation."
Expected headings
"Mechanism"
"Associations"
"CT demonstrates the fracture line which usually involves both the anterior and posterior arches. If there is an injury to the transverse atlantal ligament, the atlantodental interval (ADI) increases. The normal ADI in the adult population is less than 3 mm; in paediatric populations, the normal distance is less than 5 mm."