This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
All of the following are true about fracture of the atlas vertebra, except - 
Select and explain. 
A. Jefferson fracture is the most common type, B. Quadriplegia is seen in 80% cases, C. Atlantooccipital fusion may sometimes be needed, D. CT scans should be done for diagnosis
B: Quadriplegia is seen in 80% cases
Answer: B: Quadriplegia is seen in 80% cases 
Explanation: It is the most common type offracture of the Atlas.
There is no encroachment on the neural canal and usually no neurological damage.
CT Scan is particularly helpful in defining the fracture.
The treatment is typically conservative :-
Undisplaced stable injuries are managed by semirigid cervical collar or halo-vest until fracture unites.
Unstable injury with transverse ligament rupture (>7 nun displacement of lateral mass) is managed by halo traction followed by halo vest immobilization for a total of 3 - 4 months.
If a late instability or nonunion is present, atlanto - axial (C1 - C2) arthodesis and atlanto - occipital (cervico - occipital) fusion is done.