Interruption of the spinolaminar line at C6 and C7: a normal variant

Abstract

Objective: To describe a normal variant of the lower cervical spine manifested as interruption of the spinolaminar line. Although disruption of this line is a useful sign of significant cervical spine injury, it is important to note that this finding may represent a normal variation. Conclusion: Interruption of the spinolaminar line at C6 and C7 does not necessarily represent cervical spine dislocation and/or fracture and may be a normal anatomic variant. Knowledge of this fact may prevent false diagnosis and avoid unnecessary investigation. We propose that an alteration in facet joint orientation at C6 and C7 may represent the etiology of this normal variant.