Utility of supine oblique radiographs in detecting cervical spine injury

What is the added sensitivity of non-lateral cervical spine radiographs in the evaluation of acute cervical spine trauma?

PURPOSE

Plain radiography of the cervical spine is used as a screening test for trauma patients. We evaluated the diagnostic yield of performing anteroposterior (AP), odontoid, and oblique views in addition to the lateral view in the current era when radiographs are performed only on low-risk patients.

METHODS

All imaging reports from cervical spine radiography studies on patients aged 18 years and older in the emergency room of a major academic medical center between November 22, 2003, and January 17, 2012, were retrospectively reviewed. For the clinical workflow employed at the time of study acquisition, radiologists prospectively reviewed the lateral projection and subsequently reviewed the entirety of the images obtained. Exam reports and, when necessary, images were reviewed to determine which patients had fractures and on which projection the fractures were identified.

RESULTS

Six fractures were detected in 7218 exams. Three of these fractures were identified on the lateral radiograph, and three of these fractures were visualized on the additional projections (two on oblique and one on odontoid views). The yield of the additional projections is one fracture per 9713 radiographic projections (90% confidence interval of one fracture per 1245-47,946 examinations). For two of the patients with fractures identified on the lateral projection, an additional fracture was seen when CT was then performed.

CONCLUSIONS

Performing additional radiographs of the cervical spine including AP, odontoid, and bilateral oblique projections in trauma patients with low pretest probability of fracture augments the diagnostic yield of lateral radiographs. Considering the potential for devastating neurological outcomes from missed cervical fractures, addition of AP, odontoid, and oblique projections continues to detect fractures at a low rate.

Absent cervical spine pedicle and associated congenital spinal abnormalities - a diagnostic trap in a setting of acute trauma: case report

Background

Congenital spinal abnormalities can easily be misdiagnosed on plain radiographs. Additional imaging is warranted in doubtful cases, especially in a setting of acute trauma.

Case Presentation

This patient presented at the emergency unit of our university hospital after a motor vehicle accident and was sent to our radiology department for imaging of the cervical spine. Initial clinical examination and plain radiographs of the cervical spine were performed but not conclusive. Additional CT of the neck helped establish the right diagnosis.

Conclusion

CT as a three-dimensional imaging modality with the possibility of multiplanar reconstructions allows for the exact diagnosis and exclusion of acute traumatic lesions of the cervical spine, especially in cases of doubtful plain radiographs and when congenital spinal abnormalities like absent cervical spine pedicle with associated spina bifida may insinuate severe trauma.

[Imaging of acute spinal injury]

The mechanism location and type of injury varies according to patient age and severity of trauma. The imaging work-up with radiographs, CT and MRI must be adapted to each individual case. In the setting of minor trauma, standard radiographs are obtained when clinically indicated. In all other cases of high energy trauma, spinal trauma with neurological deficit or incomplete or difficult standard radiographic evaluation, CT will be indicated for osseous injuries while MRI will provide optimal evaluation of soft tissues. Dislocations require immediate treatment. The imaging work-up should by no means delay management. Significant sprains are rare. Several diagnostic pitfalls occur at both extremities of life.

`Clearing' the cervical spine in conscious trauma patients

This is a systematic review of published evidence regarding management of the cervical spine in conscious and co-operative trauma patients. We examine the literature in the following sections: clinical evaluation of the cervical spine; use of plain radiography; use of additional radiographic views; use of computed tomography; use of magnetic resonance imaging. Finally we consider the elderly and paediatric populations, particularly where there are significant differences compared to the general adult population. This paper also reviews the literature regarding non-medical assessment of the cervical spine. We conclude that there are well-validated decision rules available to guide the clinician, and that each imaging strategy has distinct advantages and disadvantages. Familiarity with these issues provides a sound basis for safe and effective decision-making.

[How to read radiography of the traumatic spine?]

In this paper, the imaging features of traumatic injuries of the spine in an emergency department will be reviewed. Three themes are discussed. 1) Review of current indications for additional imaging work-up. Conventional radiographs are not always mandatory, especially at the cervical level since validated criteria are available from the literature. The low sensitivity of conventional radiographs often requires additional imaging by CT (bone lesions) or MRI (disk and ligamentous lesions). The degree of urgency in scheduling these different examinations will be defined by the clinical setting and risk level (low/intermediate/high) of the injury. 2) Review of imaging features associated with stable and unstable lesions. The analysis of conventional radiographs is based on biomechanical concepts. The features of the main lesions will be illustrated by clinical cases and diagrams. 3) Review of key points that must urgently be transmitted to clinicians. The preliminary radiology report is an essential document for the management of patients with traumatic injury to the spine. It will have an impact on the type of immediate management (medical, orthopedic or surgical). A final report validating the initial interpretation should, of course, soon follow.