Neurosurgery

Fig. 22.10. Illustration of three types of fracture dislocation. These fractures are characterized by failure of all three columns as a result of compression, rotation and extension; shear forces or tension with a resulting displacement of one vertebral body with respect to the other. The type A fracture-dislocation is due to a flexion-rotation injury and is seen usually the result of a fall or a motor vehicle accident. The type B injury, which occurs as a result of shear vectors directed from the posterior to the anterior portion of the spine, results in anterolisthesis of the superior body and retrolisthesis of the inferior body, although the opposite can also occur. These are unstable injuries, since they affect all three columns and spinal cord injury is frequently seen. A third type of injury pattern, characterized by bilateral facet dislocation, is known as the type C injury. The flexion-distraction force injures the anterior column disrupting the anterior annulus and stripping the anterior longitudinal ligament.

Fig. 22.10. Illustration of three types of fracture dislocation. These fractures are characterized by failure of all three columns as a result of compression, rotation and extension; shear forces or tension with a resulting displacement of one vertebral body with respect to the other. The type A fracture-dislocation is due to a flexion-rotation injury and is seen usually the result of a fall or a motor vehicle accident. The type B injury, which occurs as a result of shear vectors directed from the posterior to the anterior portion of the spine, results in anterolisthesis of the superior body and retrolisthesis of the inferior body, although the opposite can also occur. These are unstable injuries, since they affect all three columns and spinal cord injury is frequently seen. A third type of injury pattern, characterized by bilateral facet dislocation, is known as the type C injury. The flexion-distraction force injures the anterior column disrupting the anterior annulus and stripping the anterior longitudinal ligament.

can be seen with the use of spinal instrumentation in an attempt to effectively treat these injuries.

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