Cervical Spine Trauma: How to clear the C-Spine Filmeradiology.bidmc.harvard.edu/LearningLab/musculo/Powell.pdfCervical Spine Trauma: ... Clinical Procedure involving Pts with suspected

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Cervical Spine Trauma: Interpretation of the C-Spine Film

Anthony Powell, Harvard Medical School- Year IIIGillian Lieberman, MD

Gerlock AJ, Heller RM, Kaye JJ, Kirchner SG: The Cervical Spine in Trauma. Advanced Exercises in Diagnostic Radiology, vol 11. W.B. Saunders, 1978

November 2000Anthony PowellGillian Lieberman, MD

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Common Mechanisms of Injury

• Hyperflexion- MVA, car comes to sudden stop• Hyperextension- MVA, car struck from behind• Compression- Head first dive in shallow water

Anthony PowellGillian Lieberman, MD

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Clinical Procedure involving Pts with suspected spine injury

• Pt kept in cervical collar and immobilized on spine board

• “ABCDEF” ER protocol followed (airway, breathing, circulation, disability/drugs, exposure, Foley catheter)

• History and physical (pt handled as though serious injury present)

• Decide if imaging is necessary


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Vandermark “risk-tailored” approach in assessing need for neck imaging

• No Risk- no hx or physical findings suggestive of neck injury

• Low Risk- pt has hx for a mechanism of injury unlikely to have exceeded physiologic range of cervical motion

• Medium Risk- pt has hx for mechanism of injury sufficient to have exceeded physiologic cervical ROM

• High Risk- pt has hx for mechanism of injury very likely to have exceeded physiologic ROM


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High Risk Factors for cervical vertebral injury

• High-velocity blunt trauma• Multiple, severe long bone fractures• Direct cervical region injury• Altered mental status• Fall from greater than 10 feet• Drowning / head first diving accident• Significant head or facial injury• Neck pain, tenderness, or deformity• Abnormal neurological examination• Thoracic or lumbar vertebral fracture• Hx of pre-existing vertebral disease


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Imaging Must Assess for Spinal Cord Stability

• Critical assessment which determines pt’s management and handling

• Unstable- spinal canal is no longer protected by its ligament and bony supports

• Any movement of neck could result in permanent cord damage


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Menu of Imaging Options

• Cervical Spine Plain Films-standard first line imaging modality in assessing cervical vertebral injury

• Cervical CT-to evaluate extent of injury with any definitive finding on plain film-delineating equivocal/uncertain findings on plain film

• Cervical MRI-pt with c-spine trauma who exhibits neurological signs andsymptoms suggestive of cord injury


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In order to recognize the abnormal, we need to know the

normal appearance

Let’s review some c-spine anatomy:


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Atlanto-axial joint

C2, Axis C1, Atlas

Odontoid

Anterior arch

Posterior arch

Superior articulating surface

Lateral mass

Cervical spine

Images: Netter, FH: Atlas of Human Anatomy, 2nd

ed. Novartis, 1997


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Occipito-Atlanto-Axial Joint


C1

C2

Occipital condyle

Odontiod

Lateral mass C1

Lateral Mass C2

C2


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Cervical Vertebrae

C7

Spinous process

Lamina

Vertebral bodyPedicle

Facet


Netter, FH: Atlas of Human Anatomy, 2nd

ed. Novartis, 1997


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Radiograph Correlations

Apophyseal / facet joints

Rotation effect on lateral view



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Ligaments

Ant Longitudinal lig

Post Longitudinal lig

Supraspinous lig

Ligamenta Flava


Netter, FH: Atlas of Human Anatomy, 2nd ed. Novartis, 1997


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C-Spine Plain Films

Standard 5 view series:• Cross table lateral• AP of lower cervical column• Atlanto-axial AP (open mouth, odontiod)• Bilateral supine trauma oblique views


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Normal C-spine 5 view series

Gerlock AJ, Heller RM, Kaye JJ, Kirchner SG: The Cervical Spine in Trauma. Advanced Exercises in Diagnostic Radiology, vol 11. W.B. Saunders, 1978 ; BIDMC

Lateral AP Odontoid

Right Oblique Left Oblique


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C-spine Film Interpretation 7 step process

1. Count Vertebrae (lateral)-C1 through C7-If T1 not seen get a swimmer’s view

2. Assess Curvature (frontal and lateral)3. Assess Vertebral Alignment (on lateral: 4 lines)

-ant vertebral line-post vertebral line-spinolaminar line-post spinal line


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The 4 Contour Lines



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C-spine Film Interpretation 7 step process

1. Count Vertebrae-C1 through C7-If T1 not seen Swimmer’s view

2. Assess Curvature3. Assess Vertebral Alignment (4 lines)

-ant vertebral line-post vertebral line-spinolaminal line-post spinal line

4. Assess Bony Integrity5. Assess Intervertebral Disk Spaces6. Assess OAA joint7. Soft Tissues


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Patient

• 91 y.o. female who presents to ED with a laceration and contusion to her right eye, suffered when she fell out of her bed at the assisted living facility. Fall was not witnessed. Pt is also complaining of neck pain. Pt reports no loc, n/v, visual changes, headache, numbness or weakness. Exam reveals no focal or gross neurological deficits. Pt is secured in a hard cervical collar.

• Pt sent for plain films


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Our patient’s lateral c-spine

•Farrell, Susan MD. Teaching Files. BIDMC dept of Emergency Medicine, 2000

Film findings:

1. C2 fracture through base of odontoid process

2. Approx 4mmposterior displace-ment of C1 on C2


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Our patient’s course

• An MRI confirmed the dens fx with no compromise of the spinal canal.

• Treatment: Due to pt’s age and medical conditions, she was treated conservatively with hard collar immobilization. Interval x-rays were ordered to assess for odontoid mobility.


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Let’s review some other patients whose c-spine plain films

demonstrate common cervical fractures


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Hangman’s Fracture

• Bilateral pedicle fractures of C2 (axis)• Anterolisthesis of C2 on C3• Unstable fracture• Hyperextension injury

-fracture is identical to those occurring upon hanging

-elderly may slip and strike chin on basin or counter-MVA in which chin strikes steering wheel


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Hangman’s Fracture



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Teardrop Fracture

• Avulsion fracture of anterior margin of vertebral body• Anterior longitudinal lig instability (rupture, avulsion)• Hyperextension injury• Unstable injury• Lamina may jam together causing ligamenta flava to

buckle inward and compress/contuse the spinal cord


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Teardrop Fracture



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Compression Fracture

• Variable severity, from minimal anterior wedging to complete disruption of vertebral body (burst)

• Look for loss of vertical height of vertebral body• Due to long axis compression or hyperflexion

-diving into shallow pool• Stable unstable


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Compression Fracture



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Jefferson Fracture

• Compression/bursting fracture of C1 ring• Due to long axis compression forces• Results in uni or bilateral displacement of C1 lateral

masses with respect to C2 sup articulating facets• Best seen on odontoid (open mouth) view• Unstable if transverse ligament is disrupted, resulting

in C1 anterolisthesis• May be stable


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Jefferson Fracture



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Clay Shoveler’s Fracture

• Avulsion fracture of spinous process by supraspinous ligament

• Usually occurring from C6-T2• Hyperflexion; direct trauma; downward force via

thoracoscapular muscle (as in shoveling motion)• Stable


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Clay Shoveler’s Fracture



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Dens Fracture

• Fracture of the base of the dens (odontoid) of C2• Anterior or posterior displacement of the dens• Can occur at various levels on the dens• Via hyperflexion or hyperextension of head on neck• Unstable if displacement occurs


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Dens Fracture



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References• Daffner RH: Evaluation of cervical vertebral injuries. Seminars in

Roentgenology 24:239-253, 1992• Gerlock AJ, Heller RM, Kaye JJ, Kirchner SG: The Cervical Spine in

Trauma. Advanced Exercises in Diagnostic Radiology, vol 11. W.B. Saunders, 1978

• Vandermark RM: Radiology of the cervical spine in trauma patients: Practice pitfalls and recommendations for improving efficiency and communication. AJR 155:465-472, 1990

• Novelline, RA: Squire’s Fundamentals of Radiology, ed 5. Harvard University Press, 1997

• Farrell, Susan MD. Teaching Files. BIDMC dept of Emergency Medicine, 2000

• Netter, FH: Atlas of Human Anatomy, 2nd ed. Novartis, 1997• Gunderman, RB: Essential Radiology, clinical presentation,

pathophysiology, imaging. Thieme, 1998


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Acknowledgements

• Beverlee Turner for her support and PowerPoint expertise.• Susan Farrell MD


Documents

Cervical Spine Trauma: How to clear the C-Spine Filmeradiology.bidmc.harvard.edu/LearningLab/musculo/Powell.pdfCervical Spine Trauma: ... Clinical Procedure involving Pts with suspected