Term
| Occipital condyles are dislocated off the atlas, injury is usually fatal |
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Definition
| Atlanto-Occipital Dislocation |
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Term
| This fracture is a bursting fracture of the Atlas ring with fractures through the anterior and posterior arches. The mechanism of injury is due to compressive forces on the vertex of the skull that are transmitted through the occipital condyles (diving into shallow water). |
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Definition
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Term
| This is the most common fracture of the atlas and accounts for 50% of all Atlas fractures. This fracture is typically a bilateral vertical fracture through the neural arch. The mechanism of injury is the result of the posterior arch of atlas being compressed between the occiput and the posterior arch of axis during severe hyperextension |
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Definition
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Term
| Bilateral disruption through the pedicles of the axis best seen on the lateral view just anterior to the inferior facet and usually in association with anterior displacement of C2 on C3. Prevertebral hemorrhage is common, so the retropharyngeal interspace will be increased. An avulsion fracture of the anteroinferior corner of the vertebral body often can be seen. |
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Definition
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Term
| an avulsion of the odontoid tip. |
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Definition
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Term
| This fracture is caused by a vertical compressive for to the vertex of the skull. In this fracture nucleus pulpose is propelled through the endplate of the vertebral body, and vertebra is fractured vertically causing a comminution of the vertebral body. |
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Definition
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Term
| a. Is when a triangular-shaped piece of bone is separated from the anteroinferior corner of a vertebral body, due to hyperflexion |
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Definition
| Flexion Teardrop Fracture |
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Term
| Is when a triangular-shaped piece of bone is separated from the anteroinferior corner of a vertebral body, due to hyperextension |
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Definition
| Extension Teardrop Fracture |
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Term
| “jumped facet”. the lateral view displays forward displacement of the vertebral body. The combination of the anteriorly displaced articular pillar with its former opposing pillar produces the BOW TIE SIGN. Frontal radiographs display upward rotation of the spinous process of the dislocated segment. |
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Definition
| Unilateral Facet Dislocation |
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Term
| The superior facets are seen to lie fully anterior to the inferior facets and appear to be locked, body of the dislocated segment is usually displaced anteriorly a distance greater than one half the AP diameter of the body below. Chip fractures from the tip of the articulating processes are often found with this condition |
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Definition
| Bilateral Facet Dislocation |
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Term
| avulsive injury to the spinous process, with the distal portion of the spinous process often being displaced caudally. The frontal view often depicts a double spinous sign on a single vertebra. |
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Definition
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Term
| Acceleration/Deceleration injury, Finding: Widened retropharyngeal space, widened retrotracheal space, displaced prevertebral fat stripe, tracheal deviation, loss of lordosis, acute kyphotic angulation, widened interspinous space, Vacuum phenomenon widening of z-joint |
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Definition
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Term
| fracture at the junction of the odontoid process and the body of C2 (Most common) |
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Definition
| Odontoid Fracture type II |
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Term
| a fracture found deep within the vertebral body below the base of the odontoid process |
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Definition
| Odontoid Fracture type IIII |
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