MRI as an adjunct to cervical spine clearance: a utility analysis

Area of Science:

• Traumatology
• Radiology
• Emergency Medicine

Background:

• Cervical spine (CS) injuries affect 1-3% of blunt trauma patients.
• Diagnostic imaging, including computed tomography (CT) and magnetic resonance imaging (MRI), is crucial for identifying CS injuries.
• The utility of MRI as an adjunct to CT in specific patient populations requires further evaluation.

Purpose of the Study:

• To evaluate the role of MRI as an adjunct to CT in blunt trauma patients with normal CT scans.
• To assess MRI's effectiveness in detecting cervical spine injuries in patients with persistent pain or obtundation despite normal CT findings.
• To determine if MRI findings alter clinical management decisions, such as the need for cervical fixation or the continued use of a cervical collar.

Main Methods:

• Retrospective chart review of 389 blunt trauma patients who underwent both CS CT and MRI between 2007 and 2010.
• Analysis of CT findings in 199 patients with abnormal scans.
• Detailed review of MRI results for 190 patients with normal CT scans, categorized by persistent pain, neurologic symptoms, or obtundation.

Main Results:

• In patients with persistent pain and normal CT, MRI revealed ligamentous edema/injury in 12% (not requiring operation).
• In obtunded patients with normal CT, MRI showed ligamentous edema/injury in 20% (no CS instability or operative intervention needed).
• A localizing physical examination combined with a normal CS CT effectively ruled out CS injuries requiring fixation.

Conclusions:

• A normal cervical spine CT and a localizing physical examination are sufficient to rule out CS injuries requiring cervical fixation.
• Magnetic resonance imaging does not significantly add to the decision-making process in these cases.
• Cervical collars can be safely removed when CT and physical examination are normal.