<prompt> Regarding Hangmans fracture true is:High post-admission mortalityMost common axis fractureSurgical treatment is necessaryUnion almost always occurs  <response>: d Union almost always occurs- Successful healing of C2 traumatic spondylolisthesis is reported to approach 95. This is most commonly achieved with non-operative measures, even in the presence of displacement of pars inter-articularis. 