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Case 28 - Unilateral Facet Dislocation, Carotid Dissection

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This is an example of unilateral facet dislocation.

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And we are looking at the right side and the left side.

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So you notice that on the right side,

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the superior facet is dislocated posterior to the inferior facet.

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But on the left side,

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the superior facet is anterior to the inferior facet

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in the normal position. It's a little bit angular,

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quite normal, but it's a unilateral facet dislocation.

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With unilateral facet dislocation,

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the degree of offset of the superior vertebral body to the

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inferior vertebral body is usually less than half or

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less than one-fourth. This is grade 1 offset.

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You notice that there is widening here between the

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spinous processes and the posterior elements.

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This patient had associated injury to the spinal

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cord despite only grade 1 offset.

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The cord here is bright in signal intensity

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and has been damaged.

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You see that the patient has disruption here of the

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ligamentum flavum and the interspinous ligament.

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This is the posterior column, the third column.

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Here we have the posterior longitudinal ligament coming up,

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and then it's flapping in the breeze here.

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So this is the second column injury.

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The anterior column likely infected as well with bright

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signal intensity in the intervertebral disc.

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So injury to the spinal cord, not only that,

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but this patient also showed carotid dissection secondary

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to the trauma. It's usually not secondary to the fracture,

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which would usually affect the vertebral artery,

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but secondary to the trauma, there was a carotid dissection.

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So this is how,

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with the CT scans that show these type of offsets,

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you're going to recommend MRI scan to

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confirm the injuries to the ligaments.

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There are some patients that we just recommend MRI scan because

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the patient continues to have cervical spine

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pain and we're trying to explain it.

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And so you will see cervical spine MRI scan even

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in the face of normal cervical spine CT scans.

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Here's a patient where the alignment is normal.

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The anterior alignment line is normal.

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The posterior alignment line is normal.

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The spinolaminar line shows a normal configuration.

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A little bit of distance here is normal.

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But as we get off midline,

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we see that the patient has a fracture, which is

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going from the pedicle into the facet joint.

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In this case, without dislocation and without malalignment.

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So a unilateral facet fracture.

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Here on axial CT scan,

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you see the fractures going through

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both of the facet joints,

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in this case extending to the pedicle central vertebral body

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fracture, as well as the junction between the lamina with the

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transverse process and then extending

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into the medial aspect of the pedicle.

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I want to emphasize that after looking at the fractures,

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make sure you do spend the time to look at the soft tissue

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windows because this is important to demonstrate that

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this patient has an epidural hematoma associated with the

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fractures, displacing the spinal cord

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anteriorly and to the right side.

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This would either need to be evacuated if the patient is

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symptomatic or the cord is being compromised or serial scans,

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usually MRI scan,

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to see whether that this is expanding

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over the course of time.

Report

Faculty

David M Yousem, MD, MBA

Professor of Radiology, Vice Chairman and Associate Dean

Johns Hopkins University

Tags

Neuroradiology

Head and Neck

Emergency

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