Unilateral facet lock
Motorbike accident. Neck pain.
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The vertebral body of C6 is anteriorly displaced relative to C7. The C6/7 facet joints are abnormally aligned, with out dislocated anteriorly (locked), and the other almost perched.
A radiograph was performed at a rural center before the patient was transferred to a tertiary trauma, where a CT confirmed the diagnosis (scan not available).
Classically as one of the facets is still normally aligned, the amount of anterolisthesis is limited to less that 25 - 50%. Both facets would need to be dislocated to achieve greater anterolisthesis.