Normal Cervical Spine X-ray
Cervical spine is the part of the spine that is present in neck region. It is formed by first 7 vertebrae of the spine numbered from C1 to C7.
The spine begins with C1 vertebra which is also called Atlas. Next vertebrae is Axis.
Seventh cervical vertebra or C7 is also called vertebra prominens.
It must be noted that normal cervical spine xrays do not exclude significant injury.
The lateral view is often the most informative image. In a lateral view first thing to look for is if the cervical spine is adequately covered in the view. Next, alignment of the vertebrae is looked for. Normal cervical spine xray would reveal a smooth lordotic curve and any loss of lordosis indicates spasm.
Vertebrae are studied for smooth cortical outline and height. Disc spaces are looked for any reduction of space. Prevertebral shadow is studied for any increase in width.
A normal cervical spine x-ray – Lateral View
All vertebrae are visible should be visible from skull base to the top of T1 is considered adequate.
If T1 is not visible then a repeat image with the patient’s shoulders lowered. Otherwise, a swimmer’s view may be acquired.
Anterior line or the line of the anterior longitudinal ligament [line formed by connecting anterior margins of cervical vertebral body], the posterior line the line of the posterior longitudinal ligament formed by connecting posterior margins of cervical vertebrae] and the spinolaminar line or the line formed by the anterior edge of the spinous processes are checked for continuity.
Cortical outline of all the bones should be checked for fractures.
The vertebral bodies are spaced apart by the intervertebral discs – not directly visible with X-rays. These spaces should be approximately equal in height increase as we come lower down.
Prevertebral soft tissue
Some fractures cause widening of the prevertebral soft tissue due to prevertebral haematoma. The width is measured between anterior line and anterior margin of soft tissue visible on the xray.
– Normal prevertebral soft tissue is narrow down to C4 and wider below
– Above C4 -1/3rd vertebral body width
– Below C4 – 100% vertebral body width
This xray shows a normal cervical spine. The present xray shows vertebra from C1 to C7.
The view in present picture is lateral view.
As you can view it, normal cervical spine appears lordotic. That means the anterior part of the spine appears convex and posterior concave.
Normal Cervical Spine Xray – AP View
The AP view should cover the whole cervical spine and the upper thoracic spine.
The lateral edges of the cervical spine are aligned.
Check for bony integrity to rule out fractures
The spinous processes are in a straight line and spaced approximately evenly.
In diseases or spasm of cervical spine, this lordosis of normal cervical spine is lost.
Most common of these causes a change in curvature is cervical spondylosis.
For examination of cervical spine, both anteroposterior and lateral views are required. Though both the views are important, lateral view is more informative.
Special view radiographs may be required in many cases for proper diagnosis of the disease.
Cervical spine xray can be taken in standing position or lying down on the table.
First method is done routinely on ambulatory patients in outpatient department. Lying down method is done in cases of injury or patients who cannot stand.
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