cervical spine fractures
Cervical spine fractures can occur secondary to exaggerated flexion or extension, or because of direct trauma or axial loading.
Males are affected more commonly than females with the median age of injury being 56 years. Falls, motor vehicle collisions, pedestrian accidents, cycling and diving are common causes of injury .
The cervical spine is susceptible to injury because it is highly mobile with relatively small vertebral bodies and supports the head which is both heavy and acts as a lever. C2 (~30%) and C7 (~20%) are the most commonly fractured levels .
There are many types of cervical spine fracture, some of which are unstable; general indicators of instability include:
- increased or reduced intervertebral disc space height
- increased interspinous distance
- facet joint widening
- vertebral compression >25%
- more than one vertebral column involvement
Associated injuries are present in ~67% of patients :
- blunt cerebrovascular injury (BCVI) especially in high cervical fractures, those associated with subluxation and fractures involving the transverse foramen
- rib and/or sternal fractures
- base of skull fractures
- facial fractures
The fulcrum of movement is different in children than adults, C2/3 compared to C5/6, respectively; hence, in children, cervical fractures are more common in upper vertebrae. There are also other anatomical differences of the cervical spine between children and adults which are worth bearing in mind while interpreting pediatric studies. These include more horizontal orientation of the facet joints in children, underdeveloped uncovertebral joints, mild physiological anterior wedging of the vertebral bodies, and incomplete ossification of the odontoid process.
The four major mechanisms are flexion, extension, rotational and shearing, each associated with certain fracture patterns :
- flexion: most common mechanism
- lateral flexion
- unilateral occipital condyle fracture
- lateral mass C1 fracture
- articular pillar fracture
- floating pillar
- axial loading/compression
- complex injuries
- verbreiterter prävertebraler Weichteilschatten
- hangman fracture
- facet dislocation
- unilateral facet dislocation
- chalk-stick cervical spine fracture
- Hyperextensionsfraktur HWS teardrop
- Hyperflexionsfraktur HWS teardrop
- burst (compression) fracture