The Technology
Motion Reveals What Rest Conceals
Digital Motion X-ray is the only imaging modality that captures the spine and joints under physiological load — in real time, at 30 frames per second. It is the definitive tool for diagnosing ligament injury and spinal instability.
What Is DMX?
Fluoroscopic Imaging in Motion
Digital Motion X-ray (DMX) is a dynamic fluoroscopic imaging technology that records continuous motion of the cervical and lumbar spine during active patient movement. Unlike static X-ray or MRI — which capture a single moment at rest — DMX reveals the full range of spinal motion, exposing instability, ligament laxity, and abnormal vertebral movement that is invisible in conventional imaging.
The technology is grounded in decades of peer-reviewed research and is recognized by the American Medical Association, the American College of Radiology, and the AMA Guides to the Evaluation of Permanent Impairment as a valid diagnostic tool for spinal instability.
DMX vs. Static Imaging
Why Motion Changes Everything
How It Works
The DMX Examination Process
Patient Positioning
The patient is positioned standing or seated — under physiological load — in front of the fluoroscopic imaging unit. No sedation or contrast agents are required.
Active Motion Capture
The patient performs guided range-of-motion movements — flexion, extension, lateral bending, and rotation — while the system captures continuous 30 fps imaging of the spine.
Digital Analysis
The captured motion sequence is analyzed frame-by-frame for abnormal vertebral translation, ligament laxity, and instability patterns using standardized measurement protocols.
Clinical Report
A comprehensive diagnostic report is prepared in 1-3 days, including quantified instability measurements, annotated imaging, and clinical interpretation.
Diagnostic Applications
Conditions DMX Identifies
Cervical Ligament Laxity
Cervical ligament laxity occurs when the alar, transverse, or capsular ligaments of the upper cervical spine are stretched or torn — most commonly from high-velocity trauma such as motor vehicle accidents. Because ligaments are not directly visible on static X-ray or MRI in a neutral position, laxity is frequently missed. DMX captures abnormal anterior translation of cervical vertebrae during active flexion and extension, quantifying the degree of instability against established clinical norms. Findings above 3.5 mm of anterior translation at C1-C2 are considered clinically significant under AMA Guides criteria.
Common symptoms:
Lumbar Instability
Lumbar instability refers to excessive or abnormal motion between lumbar vertebrae during functional movement — a condition that static imaging consistently underdiagnoses. The lumbar spine bears the greatest mechanical load of any spinal region, and ligament or disc compromise can produce significant instability that only manifests under weight-bearing motion. DMX records the lumbar spine during flexion and extension using DICOM imaging and Mensuration Software, measuring vertebral translation and angular motion against published normative values. Excessive motion — particularly greater than 4 mm of translation or 10 degrees of angular change — indicates pathological instability.
Common symptoms:
Whiplash-Associated Disorders
Whiplash-associated disorders (WAD) result from the rapid acceleration-deceleration forces of rear-impact collisions, which place extreme tensile stress on the cervical ligaments and facet joint capsules. The Quebec Task Force classification system grades WAD from I through IV, with grades II and III involving musculoskeletal and neurological signs. Static imaging is frequently normal in WAD grades I-III despite significant ligament injury. DMX is uniquely suited to document the cervical instability patterns characteristic of WAD — capturing the abnormal segmental motion, reduced range of motion, and compensatory movement patterns that result from ligament failure. These findings provide objective, measurable documentation of injury that correlates with symptom severity.
Common symptoms:
Post-Traumatic Spinal Injury
Post-traumatic spinal injury encompasses a broad range of structural damage to the vertebral column following motor vehicle accidents, workplace injuries, slip and falls, and sports trauma. While fractures and dislocations are readily identified on static imaging, the ligamentous and functional components of spinal injury are routinely missed. DMX provides objective measurement of spinal motion abnormalities in the acute and chronic post-traumatic period — documenting instability patterns, restricted motion, and compensatory movement that establish both the presence and severity of injury. Findings are time-stamped and reproducible, making them valuable for establishing causation and tracking recovery or deterioration over time.
Common symptoms:
Failed Static Imaging Cases
Failed static imaging cases — patients with persistent, disabling symptoms and negative or inconclusive MRI and CT findings — represent one of the most common and challenging presentations in post-traumatic care. The clinical reality is that ligament injuries, the primary source of spinal instability, are not reliably detected by static imaging modalities. MRI can identify disc pathology and gross ligament tears, but subtle ligament laxity and functional instability require dynamic assessment. DMX is specifically indicated when clinical presentation is inconsistent with static imaging findings — providing the functional imaging layer that resolves diagnostic uncertainty and gives clinicians and attorneys objective evidence to work with.
Common symptoms:
Impairment Rating Support
Accurate impairment ratings under the AMA Guides to the Evaluation of Permanent Impairment require objective, measurable findings — and spinal instability documented by DMX directly supports higher impairment ratings than symptom-based assessments alone. The AMA Guides, 6th Edition, recognizes dynamic fluoroscopy as a valid method for assessing spinal instability, and DMX findings can be used to establish whole-person impairment percentages for workers' compensation, personal injury, and Social Security disability cases. Quantified instability measurements — expressed in millimeters of translation and degrees of angular motion — provide the objective data that impairment rating physicians require, and that defense experts cannot easily dismiss as subjective.
Common symptoms:
Clinical Validation
Evidence-Based. Peer-Reviewed.
DMX methodology is supported by published research in peer-reviewed journals including Spine, the Journal of Whiplash & Related Disorders, and the Journal of Manipulative and Physiological Therapeutics. The AMA Guides, 6th Edition, recognizes dynamic fluoroscopy as a valid method for assessing spinal instability.
AMA Guides to the Evaluation of Permanent Impairment, 6th Edition — recognizes dynamic fluoroscopy for spinal instability assessment
Panjabi MM. The stabilizing system of the spine. Journal of Spinal Disorders, 1992 — foundational ligament instability research
Dvorak J, et al. Functional radiographic diagnosis of the cervical spine. Spine, 1988 — clinical validation of dynamic imaging
Frequently Asked Questions
Common Questions About DMX Imaging
What is digital motion X-ray (DMX)?
Digital Motion X-ray (DMX) is a dynamic fluoroscopic imaging technology that records continuous video of the spine during active patient movement at 30 frames per second. Unlike static X-ray or MRI — which capture a single moment at rest — DMX reveals the full range of spinal motion under physiological load, exposing ligament laxity, instability, and abnormal vertebral movement that conventional imaging cannot detect.
How is DMX different from a regular X-ray or MRI?
Static X-ray captures one frame with the patient at rest and cannot show motion-dependent instability. MRI provides excellent soft tissue detail but is performed lying down in a neutral, unloaded position — missing the functional instability that only appears during movement. DMX records the spine in real time during active movement, capturing the dynamic behavior of ligaments and vertebrae that static modalities are structurally unable to show.
What conditions can DMX diagnose?
DMX is specifically indicated for cervical ligament laxity, lumbar instability, whiplash-associated disorders (WAD), post-traumatic spinal injury, and cases where static imaging has returned normal results despite ongoing symptoms. It is also used to generate objective, quantified findings for AMA Guides-based impairment ratings in workers' compensation and personal injury cases.
Is DMX imaging recognized by the AMA?
Yes. The AMA Guides to the Evaluation of Permanent Impairment, 6th Edition, recognizes dynamic fluoroscopy as a valid method for assessing spinal instability. DMX methodology is also supported by published research in peer-reviewed journals including Spine, the Journal of Whiplash & Related Disorders, and the Journal of Manipulative and Physiological Therapeutics.
How does DMX help personal injury cases?
DMX produces objective, measurable findings — quantified in millimeters of vertebral translation and degrees of angular motion — that document spinal instability in a way that static imaging cannot. These findings are harder to dismiss under cross-examination, provide scientific credibility grounded in peer-reviewed methodology, and can be presented as visual evidence to a jury. The medical director of Digital Motion X-ray of Utah is also available as an expert witness for litigation.
What does a DMX exam involve?
The patient stands or sits in front of the fluoroscopic imaging unit — no sedation or contrast agents are required. The patient performs guided range-of-motion movements including flexion, extension, lateral bending, and rotation while the system captures continuous 30 fps imaging. The exam typically takes 30 to 45 minutes. A comprehensive diagnostic report with quantified instability measurements, annotated imaging, and clinical interpretation is delivered within 1 to 3 business days.
Where can I get DMX imaging in Utah?
Digital Motion X-ray of Utah is Utah's premier dedicated DMX imaging facility, located in Salt Lake City. The clinic is a Utah licensed imaging center built specifically for cases where standard imaging falls short. Referrals are accepted from both physicians and personal injury attorneys. Contact the clinic to schedule a study or discuss a specific case.
Ready to Refer a Patient for DMX?
Our clinical team is available to discuss your patient's case and determine whether DMX is the appropriate next step.