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Posterior atlantoaxial dislocation without associated fracture.

S Sud¹, S Chaturvedi, T B S Buxi

¹Department of CT & MRI, Sir Ganga Ram Hospital, Old Rajender Nagar, New Delhi--110060, India. northmriscan@now-india.net.in

Skeletal Radiology

|August 27, 2002

Summary

A 38-year-old man experienced posterior displacement of the atlas after trauma. Imaging confirmed atlas displacement without fracture or neurological deficit, highlighting a rare upper cervical spine injury.

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Area of Science:

Orthopedics
Neurosurgery
Radiology

Background:

Upper cervical spine injuries, particularly involving the atlas (C1) and axis (C2), require careful diagnosis.
Traumatic atlantoaxial instability can result from various mechanisms, necessitating detailed imaging for accurate assessment.

Observation:

A 38-year-old male presented with posterior displacement of the atlas following trauma.
Clinical examination revealed no neurological deficits.
Radiographic evaluation, including CT and MRI, was performed.

Findings:

Imaging demonstrated posterior displacement of the atlas relative to the axis.
The odontoid peg was positioned anterior and to the right of the anterior atlas arch.
No associated fractures of the atlas or axis were identified.

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Implications:

This case underscores the possibility of significant upper cervical spine displacement without associated fractures or neurological compromise.
Accurate radiological assessment is crucial for identifying subtle yet potentially unstable injuries.
Understanding such injuries aids in appropriate management strategies for atlantoaxial instability.