type 2 hangman fracture
C2-C3 traumatic spondylolisthesis (hangman's fracture) - Levine-Edwards classification. Type I: Minimal translation (<3mm) without C2-C3 angulation; stable. Type II: Significant C2-C3 angulation and translation (>3mm); disc disruption, unstable. Type IIA: More angulation than type 2, without translation; unstable due to flexion-distraction injury. Type III : Severe C2-C3 angulation and translation; sometimes uni-/bilateral facet dislocation; unstable.