<prompt> Hangmans fracture is ?Subluxation of C5 over C6Fracture dislocation of C2Fracture dislocation of ankle jointFracture of odontoid  <response>: Ans. is b i.e., Fracture dislocation of C2 Hangmans fracture Hangmans fracture is bilateral fracture of the pars interaicularis of axis C2 with traumatic spondylolisthesis of axis C2 over C3 veebrae. Thus Hangmans fracture is not simply a fracture, but fracture dislocation of axis C2. The mechanism of injury is extension with distraction in true, judicial hangmans fracture and hyper-extension, axial compression . flexion in civilian injuries, which are now more common. It is second most common type of Axis C2 fracture, second only to odontoid fractures. Fatalaties are common, However, neurological deficit is unusual as the fracture of posterior arch decompress the spinal cord. Most of the fatalities occur at the scene of injury, acute post admission moality is low. Successful healing of C2 traumatic spondylolishesis is repoed to approach 95. This is most commonly achieved with non-operative measures, even in the presence of displacement of pars inter-aicularis. Undisplaced fractures are treated in a semi-rigid ohosis, and displaced fracture are closed reduced treated with halo-vest. Occasionally, the hangmans fracture is associated with a C23 facet dislocation. This is a severely unstable injury; open reduction and stabilization is required. 