Fig. 18
From: MDCT of acute subaxial cervical spine trauma: a mechanism-based approach
Hyperextension compression with traumatic spondylolisthesis. a Mid-sagittal CT image shows anterior listhesis of C7 over D1 (white arrow). This could result from hyperflexion distraction or, rarely, hyperextension injury. The spinolaminar line is continuous at the level of anterior translation, which suggests a hyperextension injury vector. b Left parasagittal image from the facet joint shows a vertically oriented fracture through the left pars interarticularis of C7 (black arrow) with impaction of the tip of the inferior articular process of C6 in the fracture gap—highly suggestive of hyperextension injury. Similar pars interarticularis fracture was also seen on the right side of C7 (not shown)