What is facet dislocation?
Facet dislocation refers to the anterior displacement of one vertebral body on another. Without a fracture, the only way anterior displacement can occur is by dislocation of the facets. Facet dislocation can occur to varying degrees: subluxed facets. perched facets.
What is a unilateral dislocation?
Unilateral facet dislocation occurs when flexion, along with rotation, forces one inferior articular facet of an upper vertebra to pass superior and anterior to the superior articular facet of a lower vertebra, coming to rest in the intervertebral foramen (see the image below). Unilateral facet dislocation.
What is bilateral facet dislocation?
Bilateral facet dislocation occurs when a vertebra’s inferior facet dislocates anteriorly over the lower vertebra’s superior facet, locking in the intervertebral foramens, creating a severely unstable fracture. 2,3. CT has a higher sensitivity for C-spine injury and is the preferred imaging modality.
What is facet joint subluxation?
Subluxation. The facets of a vertebra are mildly displaced in a forward position, over the facet surface of the vertebra below. This condition results in a mild anterior (forward) displacement of one vertebral body over the other.
What is occipital dislocation?
Atlanto-occipital dislocation, orthopedic decapitation, or internal decapitation describes ligamentous separation of the spinal column from the skull base. It is possible for a human to survive such an injury; however, 70% of cases result in immediate death.
At which level is a unilateral facet dislocation most likely to occur?
The inferior articular facet of vertebral above moves over the superior facet of the vertebral below and becomes locked. It usually affects C4-C5 or C5-C6 levels.
How can I reduce cervical facet dislocation?
Ventral decompression, reduction, and stabilization of cervical facet dislocations eliminates the risk of extruded disc fragments encroaching the spinal cord, provides an effective method of reducing cervical facet dislocations, and provides a method for stabilizing a single motion segment.
What is a facet dislocation?
Facet dislocation. Facet dislocation refers to anterior displacement of one vertebral body on another. Without a fracture, the only way anterior displacement can occur is by dislocation of the facets. The injury usually results from forced flexion of the cervical spine.
What causes cervical spine facet fracture-dislocation?
The injury usually results from forced flexion of the cervical spine. However, where there is a degree of rotation, the facet dislocation may only occur to one facet joint: 1. Gomes S, Rudkin S, Tsai F et-al. Bilateral cervical spine facet fracture-dislocation.
Which CT scan shows a right sided C6/7 facet dislocation?
A CT scan of the cervical spine is obtained and shows a right sided C6/7 facet dislocation. Which of the following images is most representative of this injury?
