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
[{'content': 'All of the following are true about fracture of the atlas vertebra, except - \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is the most common type offracture of the Atlas.\nThere is no encroachment on the neural canal and usually no neurological damage.\nCT Scan is particularly helpful in defining the fracture.\nThe treatment is typically conservative :-\nUndisplaced stable injuries are managed by semirigid cervical collar or halo-vest until fracture unites.\nUnstable 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.\nIf a late instability or nonunion is present, atlanto - axial (C1 - C2) arthodesis and atlanto - occipital (cervico - occipital) fusion is done.', 'role': 'assistant'}]