Hangman fracture (also known as traumatic spondylolisthesis of axis) is a fracture which involves the pars interarticularis of C2 on both sides, and is a result of hyperextension and distraction. bilateral lamina and pedicle fracture at C2 usually associated with anterolisthesis of C2 on C3 http://radiopaedia.org/articles/hangman-fracture
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