Ross Hauser, MD. Reviews of Diagnostic Imaging Technology for Cervical Spine Instability

Ross Hauser, MD. Reviews of Diagnostic Imaging Technology for Cervical Spine Instability

Humans spend the larger part of each day in the upright position, the very position that causes most symptoms, yet most diagnostic tests are performed with the patient in the supine, resting position, the very position that gives them relief. Scanning in the upright position can show the brain, brainstem, and cervical spine under the effects of gravity, and its alterations in blood flow, venous drainage, and cerebrospinal fluid flow can also be seen while the person is upright. Many times, symptomology occurs with a specific head/neck position such as flexion, so scanning the patient in the symptomatic position and motion will improve diagnostic accuracy.

Joint instability is difficult to detect by supine static scanning methods. To find joint instability, especially in the neck, it is important to scan the person when they are upright and preferably during motion or their symptomatic position, whether it be with upright x-rays, MRI, or position CT scans. (1)

The structural and clinical effects of upper and lower cervical instability and whiplash injury can be readily observed and quantified with advanced imaging technology. These new technologies and the resultant understanding of the biomechanics and neuropathology of cervical instability and whiplash injuries are of critical importance in the treatment of these injuries and in proving their existence in the medical-legal realm. These imaging modalities are readily available. However, analysis of the results is a timely and complex task. These modalities are as follows:

Cervical Digital Motion X-ray (C-DMX)

Cervical Digital Motion X-ray (C-DMX) – This modality is essentially a video-fluoroscopic x-ray movie of the spine in motion. The procedure is completed with a device resembling a conventional C-arm. However, far less radiation is utilized than theoretically would be emitted with a conventional C-arm, due to the use of digital processing technology.

A DMX of the spine allows for a continuous and detailed examination of cervical spinal movement.  DMX allows unrestricted assessment of C0-C7 motion in multiple dimensions including sagittal, rotational, and frontal planes. DMX studies typically include moving the head and neck through protraction, retraction, flexion, extension, rotation, and lateral flexion; while observing in real-time, the motion of the cervical vertebrae from C0-C7.

The DMX studies show the functional integrity of the ligaments in the cervical spine, specifically the anterior and posterior longitudinal, supraspinous, interspinous, ligamentum flavum, facet capsular ligaments, transverse, and alar ligaments. Conventional cervical spinal X-rays are static views of the spine as a snapshot in time and, perforce, cannot evaluate the spine in real-life motion. The DMX is a comprehensive movie of the cervical spine in all axes of movement and includes the open-mouth odontoid view in motion, which is the critical view of the C1-C2 vertebral relationship during lateral flexion.

Digital motion x-ray (videofluoroscopic) examination of the cervical spine has been shown to provide a high degree of diagnostic accuracy for the identification of vertebral instability in patients with chronic pain stemming from whiplash trauma. (2) Dynamic MRI in the craniocervical instability (CCJ Instability) was found to be able to detect cases of cord compression that were not seen by static supine MRI. (3) In a study involving 1,200 patients, cerebellar tonsillar descent (Chiari) of at least 1 mm was 4 times more likely to be diagnosed by an upright MRI vs. one supine. (4) Cerebellar tonsillar ectopia was found 2.5 times more often in whiplash patients when an upright MRI was done vs. one that was supine. Soft tissue lesions in this study and others are found in the upper cervical region about 3-5 times more often when an upright (especially with flexion/extension views) vs. recumbent is done.(5,6,7,8)

The digital motion x-ray is explained and demonstrated below.

Critical relationships observed and quantified in the DMX analysis include:

DMX Facet relationships and ligamentous instability, expressed as facet gapping in cervical flexion in oblique and AP spinal views

Foraminal compression during oblique flexion-extension views

DMX Anterolisthesis (forward slip) and retrolisthesis (posterior slip) in flexion and extension.

DMX demonstrating C1 lateral flexion and extension sequences

In this image, the caption reads Digital Motion X-ray demonstrating severe bilateral atlantoaxial (C1-C2) instability with open mouth view and lateral neck flexion.

In this image the caption reads Digital Motion X-ray demonstrating severe bilateral atlantoaxial (C1-C2) instability with open mouth view and lateral neck flexion.

Right posterior malrotation of C2

In this image – the caption reads right posterior malrotation of C2. In this open-mouth view, the C2 spinous process is to the right of the midline in comparison to the dens of the C2. These malrotations, when present chronically, are a sign of C1-C2 instability.

Magnetic Resonance Imaging

Three cross-sections of upper spinal cord MRI.

In this image, the caption explains Three cross-sections of upper spinal cord MRI. In the A Image: Normal MRI. In the B image: Partial blockage of cerebrospinal fluid posteriorly. C image: Complete blockage of cerebrospinal fluid posteriorly.

The Circle of Willis, the convergence of several arteries at the bottom of the brain as seen with an MRI angiogram.

In positional upright weight-bearing MRI, the patient is seated or standing in a specialized MRI scanner. A secondary coil is placed around the target region, such as the cervical spine, and the patient is placed in stressed positions, such as flexion, extension, or lateral flexion. With analogy to the DMX concept, CpMRI is a more “realistic” representation of the target, such as the cervical spine, under physiological conditions. It is not quite “motion,” as the patient must be perfectly still to achieve usable images, but the next option. The pathology that is visualized includes injured alar or transverse ligaments with stress applied to them in lateral flexion, cervicomedullary junctional compression by the mass effect of C1 capsulosynovitis during flexion, and accentuated cervical herniated discs, that are larger and more easily seen during extension.

Traditional radiographic testing, including MRIs, x-rays, and CT scans, is often done in the supine static position and can miss the true diagnosis. When these and other diagnostic tests, such as digital motion x-ray and transcranial, extracranial, and transorbital Doppler ultrasounds, as well as electrocardiograms and heart rate variability examinations, are done while the head and neck are moving and/or in the upright position, not only can cervical instability be visualized and diagnosed, but so can the pathophysiology it is causing. A treatment plan to restore as best as possible the cervical anatomy, lordotic curve, and stability with cervical vertebral adjustments, cervical spine curve correction, and Prolotherapy, respectively, can be done and successful treatment can be verified not just by symptom resolution but also by repeat testing methods documenting improvements.

Please see these articles for related discussions:

We hope you found this article informative and it helped answer many of the questions you may have surrounding imaging for cervical spine problems. Just like you, we want to make sure you are a good fit for our clinic prior to accepting your case. While our mission is to help as many people with chronic pain as we can, sadly, we cannot accept all cases. We have a multi-step process so our team can really get to know you and your case to ensure that it sounds like you are a good fit for the unique testing and treatments that we offer here.

Please visit the Hauser Neck Center Patient Candidate Form

1 Mayer M, Zenner J, Auffarth A, Blocher M, Figl M, Resch H, Koller H. Hidden discoligamentous instability in cervical spine injuries: can quantitative motion analysis improve detection?. European Spine Journal. 2013 Oct;22(10):2219-27. [Google Scholar]
2 Freeman MD, Katz EA, Rosa SL, Gatterman BG, Strömmer EM, Leith WM. Diagnostic accuracy of videofluoroscopy for symptomatic cervical spine injury following whiplash trauma. International journal of environmental research and public health. 2020 Jan;17(5):1693. [Google Scholar]
3 Gupta V, Khandelwal N, Mathuria SN, Singh P, Pathak A, Suri S. Dynamic magnetic resonance imaging evaluation of craniovertebral junction abnormalities. Journal of computer-assisted tomography. 2007 May 1;31(3):354-9. [Google Scholar].
4 Freeman MD, Rosa S, Harshfield D, Smith F, Bennett R, Centeno CJ, Kornel E, Nystrom A, Heffez D, Kohles SS. A case-control study of cerebellar tonsillar ectopia (Chiari) and head/neck trauma (whiplash). Brain Injury. 2010 Jul 1;24(7-8):988-94. [Google Scholar]
5 Suzuki F, Fukami T, Tsuji A, Takagi K, Matsuda M. Discrepancies of MRI findings between recumbent and upright positions in the atlantoaxial lesion. Report of two cases. Eur Spine J. 2008;17 Suppl 2(Suppl 2):S304-S307. [Google Scholar]
6 Michelini G, Corridore A, Torlone S, et al. Dynamic MRI in the evaluation of the spine: state of the art. Acta Biomed. 2018;89(1-S):89-101. Published 2018 Jan 19. doi:10.23750/abm.v89i1-S.7012 [Google Scholar]
7 Gilbert JW, Wheeler GR, Lingreen RA, Johnson RK, Scheiner SJ, Gibbs RD. Upright weight-bearing cervical flexion/extension dynamic magnetic resonance imaging: case report and review of the literature. European Journal of Radiology Extra. 2006 Dec 1;60(3):121-4. [Google Scholar]
8 Smith FW, Dworkin JS (eds): The Craniocervical Syndrome and MRI. Basel, Karger 2015. [Google Scholar]

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