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Scientific Articles   |    
Assessment of the Posterior Ligamentous Complex Following Acute Cervical Spine Trauma
Jeffrey A. Rihn, MD1; Charles Fisher, MD, MHSc(Epi), FRCSC2; James Harrop, MD3; William Morrison, MD4; Nuo Yang, PhD1; Alexander R. Vaccaro, MD, PhD1
1 The Rothman Institute, Thomas Jefferson University Hospital, 925 Chestnut Street, 5th Floor, Philadelphia, PA 19107
2 Vancouver General Hospital, University of British Columbia, 604-2733 Heather Street, D6-HP, Vancouver, V5Z 3J5 BC, Canada
3 Department of Neurosurgery, Thomas Jefferson University Hospital, 909 Walnut Street, 2nd Floor, Philadelphia, PA 19107
4 Department of Radiology, Thomas Jefferson University Hospital, Suite 3390, 111 South 11th Street, Philadelphia, PA 19107
View Disclosures and Other Information
Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any one year, outside funding or grants in excess of $10,000 from Medtronic, Inc., in conjunction with the Spine Trauma Study Group. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, and Vancouver General Hospital, Vancouver, British Columbia, Canada

Copyright ©2010 American Society for Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2010 Mar 01;92(3):583-589. doi: 10.2106/JBJS.H.01596
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Abstract

Background: 

Magnetic resonance imaging is commonly used to assess the integrity of the posterior ligamentous complex following cervical trauma, but its accuracy and reliability have not been documented, to our knowledge. The purpose of this study was to determine the diagnostic accuracy of magnetic resonance imaging in detecting injury to specific components of the posterior ligamentous complex of the cervical spine.

Methods: 

Patients with an acute cervical spine injury that required posterior surgical treatment were prospectively studied. The six components of the posterior ligamentous complex were characterized as intact, incompletely disrupted, or disrupted on preoperative magnetic resonance imaging studies by a radiologist and intraoperatively by two surgeons. Correlation between the magnetic resonance imaging and intraoperative findings was determined. The percent agreement, sensitivity, specificity, negative predictive value, and positive predictive value of magnetic resonance imaging as a tool for characterizing the integrity of the posterior ligamentous complex were calculated.

Results: 

Forty-seven consecutive patients with a total of seventy levels of injury were studied. Overall, there was moderate agreement between the magnetic resonance imaging and intraoperative findings for the supraspinous and interspinous ligaments (kappa scores of 0.46 and 0.43, respectively) and fair agreement between those for the ligamentum flavum, left and right facet capsules, and cervical fascia (kappa scores of 0.32, 0.31, 0.26, and 0.39, respectively). The sensitivity of the magnetic resonance imaging was greatest for the cervical fascia (100%) and the lowest for the facet capsules (80%). Specificity ranged from 56% (for the facet capsules) to 67% (for the interspinous ligament). The positive predictive value ranged from 42% (for the cervical fascia) to 82% (for the interspinous ligament).

Conclusions: 

Magnetic resonance imaging is sensitive for the evaluation of injury to the posterior ligamentous complex in the setting of acute cervical trauma. However, it has a lower positive predictive value and specificity, suggesting that injury to the posterior ligamentous complex may be "over-read" on magnetic resonance images. If magnetic resonance imaging is used in isolation to guide treatment, the high rate of false-positive findings may lead to unnecessary surgery. Other factors, including the morphology of the injury and the neurological status, should be considered as well when devising a treatment plan.

Level of Evidence: 

Diagnostic Level I. See Instructions to Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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