Concussion is fundamentally a dual injury — the brain and the upper cervical spine sustain damage from the same forces. Why addressing only the brain injury leaves a substantial portion of post-concussion dysfunction unaddressed.
Concussion is typically thought of as a brain injury, and standard concussion care focuses appropriately on the brain — neurological evaluation, vestibular rehabilitation, vision therapy, graded exercise rehabilitation, cognitive rest then gradual return to activity. For approximately 70 percent of patients, this comprehensive approach addresses the essential problem and recovery proceeds. But for the 30 percent who develop persistent post-concussion symptoms — and particularly for those whose vestibular symptoms persist months or years after the original injury — a substantial portion of the dysfunction may not be in the brain at all (Iverson et al., 2017). It is in the upper cervical spine, which sustained injury from the same forces that produced the concussion but was never specifically evaluated or addressed in standard care.
The biomechanical reality of concussion makes the dual injury picture essentially unavoidable. Concussion occurs when the brain is subjected to rapid acceleration-deceleration forces, typically with a rotational component. The same forces, transmitted through the upper cervical structures, produce ligamentous strain, joint capsule injury, deep muscle dysfunction, and altered alignment in the region between the skull and the upper neck. A 2005 study by Kaale and colleagues, published in the Journal of Neurotrauma, documented upper cervical ligamentous injuries occurring with whiplash mechanisms at forces well below those required for diagnosable concussion (Kaale et al., 2005). When trauma is sufficient to produce concussion, the upper cervical structures have essentially always experienced forces well above the threshold for their own injury.
The 2017 Berlin Consensus Statement on Concussion in Sport — the gold-standard mainstream document on concussion management — explicitly acknowledges the cervicogenic contribution to persistent post-concussion symptoms (McCrory et al., 2017). This is not fringe medicine; it is mainstream concussion science. The challenge is that recognizing the cervical contribution in the consensus statement has not yet translated into routine evaluation of the cervical component in standard post-concussion care. For many patients, this gap is the difference between recovery and chronic dysfunction.
This article walks through the biomechanical reality of concussion as a dual injury, the specific mechanisms by which the cervical component contributes to post-concussion vestibular dysfunction, why the cervical component so often goes unrecognized, who is most likely to have a significant cervical contribution, and what addressing this component can offer for patients whose post-concussion recovery has not proceeded as expected.
The Biomechanical Reality: Why Concussion Is a Dual Injury
Understanding the cervical contribution to post-concussion vestibular dysfunction begins with understanding why the brain and the upper cervical spine cannot be separated mechanically during a concussion event.
The forces involved in concussion
Concussion is produced by sudden acceleration-deceleration of the head. The forces can come from a direct impact (head-to-head collision, head striking the ground, impact from an object), from a whiplash-type mechanism without direct head impact (rear-end motor vehicle collision, sudden deceleration in any context), or from forces transmitted indirectly through the body (falls onto the buttocks transmitting forces up the spine). In all of these mechanisms, the head experiences rapid changes in velocity, often with a rotational component, and the brain inside the skull experiences shear forces, stretching of axons, and disruption of normal neural function.
The same forces traverse the upper cervical structures
The head does not move independently of the neck. The forces that produce concussion necessarily traverse the upper cervical spine — the joints between the skull, atlas (C1), and axis (C2). The upper cervical region is the most mobile part of the spine, with the atlas-axis joint alone responsible for approximately 50 percent of all cervical rotation. This mobility makes the region particularly vulnerable to the forces involved in trauma. The ligaments, joint capsules, muscles, and bones of this region must absorb and transmit the forces, and they do so by experiencing those forces themselves.
What this produces structurally
The structural consequences of concussion-level forces on the upper cervical region include ligamentous injuries (particularly to the alar ligaments and transverse ligament), joint capsule strain and disruption, deep cervical muscle dysfunction and chronic protective tension, altered alignment of the atlas relative to the skull and axis, and persistent dysfunction of the proprioceptive structures embedded in these tissues. Kaale and colleagues used MRI to document these injuries in whiplash patients, demonstrating that the structural injuries are real and visible on imaging when looked for specifically (Kaale et al., 2005).
Why this gets missed in standard concussion imaging
Standard concussion imaging — CT to rule out hemorrhage, MRI to rule out structural brain pathology — does not specifically evaluate the upper cervical structural changes. Cervical X-rays performed acutely are looking for fracture or gross instability, not the smaller alignment changes and ligamentous strain that produce chronic dysfunction. The imaging is appropriate for ruling out emergent injury but does not detect the precision-level structural problems that drive persistent post-concussion symptoms.
How the Cervical Injury Contributes to Vestibular Dysfunction
Once the dual injury is established, the specific mechanisms by which the cervical component drives ongoing vestibular dysfunction become identifiable. Several distinct pathways are involved.
Distorted proprioceptive input to the vestibular nuclei
The deep suboccipital muscles and joint capsules of the upper cervical region contain dense concentrations of proprioceptive receptors — muscle spindles, mechanoreceptors, and other sensors that signal head position and movement (Kulkarni et al., 2001; McLain, 1994). These receptors send their signals directly to the vestibular nuclei in the brainstem (Gdowski & McCrea, 2000) — the same region that processes input from the inner ear vestibular system. The cervical proprioceptive input is not auxiliary to vestibular processing; it is integrated at the same level.
When the cervical structures are injured by the concussion mechanism, the proprioceptive receptors send distorted signals. A 2022 narrative review by Peng and colleagues in the Journal of Clinical Medicine described this state as erroneous proprioceptive afferents — signals that actively misinform the brain rather than simply being diminished (Peng et al., 2022). The vestibular nuclei receive continuous misleading information about head position, and the result is the dizziness, disequilibrium, and motion sensitivity that characterizes post-concussion vestibular dysfunction in many patients.
Disrupted central compensation after the brain injury
Recovery from any vestibular insult — including the central effects of concussion on vestibular networks — depends on the brain’s central compensation process. The vestibular nuclei recalibrate by relying more heavily on visual input and proprioceptive input until the system stabilizes. The proprioceptive input most heavily involved in this compensation comes from the upper cervical spine.
When the cervical input is itself distorted by injury, central compensation cannot proceed normally. The brain is attempting to recalibrate using information that is itself unreliable. The compensation either stalls, completes incorrectly, or remains incomplete indefinitely. This is one of the primary mechanisms by which post-concussion vestibular symptoms become chronic rather than resolving with time as they would with normal compensation.
The trigeminocervical complex and migraine activation
Post-concussion patients commonly develop migrainous features, including post-traumatic vestibular migraine. The trigeminocervical complex — a brainstem region where cervical sensory input converges with trigeminal sensory input (Bartsch & Goadsby, 2003) — is the anatomical link between cervical injury and migraine system activation. Distorted cervical input from concussion-related injury feeds chronically into this complex, contributing to migraine system activation that can drive persistent post-concussion vestibular symptoms. For patients with prominent migraine features after concussion, the cervical contribution through this pathway is often significant.
Autonomic dysregulation and the cervical contribution
Concussion frequently produces autonomic dysregulation — exercise intolerance, blood pressure dysregulation, heart rate variability changes, sometimes meeting criteria for post-traumatic POTS. The cervical sympathetic chain and autonomic afferents from the upper cervical region contribute to autonomic regulation, and structural problems in this area can affect autonomic function alongside the central effects of the concussion itself. For patients with prominent autonomic features after concussion, the cervical contribution to this dimension of dysfunction can be substantial.
Craniocervical hydrodynamic effects
Michael Flanagan’s 2015 paper in Neurology Research International described the craniocervical junction as a potential choke point for craniospinal hydrodynamics — venous drainage, cerebrospinal fluid circulation, and the mechanical environment of brainstem structures can all be affected by misalignment at this level (Flanagan, 2015). For concussion patients, this represents another pathway by which cervical structural problems can affect the brainstem environment during recovery, potentially contributing to persistent symptoms through mechanisms beyond direct proprioceptive disruption.
Why the Cervical Contribution So Often Goes Unrecognized
Despite the established biomechanical reality of dual injury and the explicit acknowledgment in concussion consensus statements, the cervical contribution to post-concussion vestibular dysfunction routinely goes unrecognized in standard care. Several factors contribute to this.
Standard concussion care focuses appropriately on the brain
The brain injury aspect of concussion is appropriately the primary focus of acute concussion care. Ruling out severe brain injury, managing acute symptoms, providing appropriate cognitive rest, and engaging vestibular rehabilitation and vision therapy form the foundation of evidence-based concussion management. These interventions are appropriate and produce meaningful improvement for most patients. The challenge is that they do not specifically address the cervical component, which may be substantial in patients with persistent symptoms.
Cervical evaluation is not in standard concussion protocols
Standard concussion evaluation does not include specific assessment of cervical proprioception, cervical joint position error testing, or three-dimensional imaging of the upper cervical region. The cervical contribution is mentioned in the consensus statements but is not built into the routine evaluation pathway. Patients can complete extensive post-concussion workups that did not at any point specifically evaluate the cervical component that may be contributing to their symptoms.
Cervical symptoms attributed to muscle strain
When cervical symptoms accompany the concussion, they are often attributed to musculoskeletal strain that will resolve with time and conservative measures. The deeper structural injury — joint capsule injury, ligamentous strain, alignment changes — that may be driving persistent symptoms is not specifically evaluated. Patients with significant cervical features in the acute phase are sometimes told the neck pain will resolve as the concussion improves, when the actual situation is that the cervical injury is its own component requiring its own attention.
Standard imaging does not detect the relevant problems
Standard cervical imaging in concussion patients focuses on ruling out fracture, dislocation, and gross instability — emergent injuries that require immediate management. The smaller alignment changes, subtle joint capsule injuries, and ligamentous strain that produce chronic dysfunction are not specifically evaluated and typically do not show on standard X-rays or MRI. The absence of findings on standard imaging is sometimes interpreted as evidence that no significant cervical problem exists, when the actual situation is that the relevant problems were not specifically evaluated.
Patients adapt and accept persistent symptoms
Months or years after the original concussion, patients have often adapted to the persistent symptoms as their new baseline. The acute concussion has long since resolved by standard markers. Symptoms that persist are sometimes attributed to general post-concussion syndrome without specific identification of contributing factors. Patients who do not actively seek further evaluation continue with the persistent dysfunction.
Who Has Significant Cervical Contribution to Their Post-Concussion Vestibular Dysfunction
Based on the biomechanical reality of dual injury, every concussion patient has some degree of cervical involvement. But the clinical significance of that involvement varies substantially across patients. Several patterns identify those most likely to have substantial cervical contribution requiring specific attention.
Mechanism of injury involving substantial rotational forces
Concussions involving rotational mechanisms — sports collisions with rotational components, motor vehicle accidents with side impacts, falls with rotational landing — produce more substantial upper cervical injury than purely linear impacts. The upper cervical joints are particularly vulnerable to rotational forces given their mobility, and rotational concussion mechanisms predictably produce more significant cervical involvement.
Whiplash mechanism with or without head impact
Concussions occurring in the context of whiplash — rear-end motor vehicle accidents, sudden deceleration injuries — essentially always involve substantial cervical injury. Even in patients whose primary diagnosis is concussion, the cervical component is reliably present and often clinically significant. The classic whiplash mechanism is one of the most reliably cervically-involved concussion patterns.
Persistent cervical symptoms during recovery
Patients with persistent neck pain, suboccipital tension, restricted cervical range of motion, or cervicogenic headache pattern alongside their post-concussion symptoms are demonstrating ongoing cervical involvement regardless of what their initial workup showed. The persistent cervical symptoms reflect structural problems that have not resolved with conservative management and that may be contributing to the vestibular dysfunction through the mechanisms described earlier.
Position-dependent vestibular symptoms
Post-concussion vestibular symptoms that vary significantly with head and neck position — worsening with sustained postures, with specific cervical movements, or with prolonged static positioning — suggest a substantial cervicogenic component. Pure central vestibular dysfunction from concussion typically does not have this strong positional pattern, and its presence points toward cervical involvement that deserves attention.
Stalled recovery despite appropriate concussion care
Patients who have engaged consistently with appropriate concussion care — vestibular rehabilitation, vision therapy, graded exercise, cognitive rehabilitation — and whose recovery has plateaued are showing one of the most reliable indicators of unaddressed cervical contribution. The brain-focused interventions are doing what they can, and persistent symptoms suggest something else is involved. For most stalled post-concussion recoveries, that something else is cervical.
Multiple prior concussions
Patients with multiple lifetime concussions have accumulated cervical injury from each event, often producing chronic structural problems that contribute to the current presentation regardless of which specific concussion is being treated. Athletes with concussion histories, individuals with multiple motor vehicle accidents, and others with cumulative trauma exposure typically have substantial chronic cervical involvement.
How Addressing the Cervical Component Affects Recovery
For patients with significant cervical contribution to their post-concussion vestibular dysfunction, addressing the structural cervical component can produce improvement that brain-focused interventions alone have not. The mechanism is direct — reducing the distorted proprioceptive input allows the brain to receive more accurate information, which allows central compensation to proceed more effectively.
The role within comprehensive post-concussion care
Upper cervical evaluation and care for post-concussion patients is appropriately complementary to standard concussion care rather than a replacement for it. Vestibular rehabilitation, vision therapy when convergence and accommodation are affected, graded exercise rehabilitation, and cognitive rehabilitation remain the foundation of post-concussion care. Upper cervical care addresses a specific component — the structural cervical contribution — that the standard treatments do not specifically target.
Why timing matters
Once acute medical stability has been established (typically within the first few weeks after concussion), addressing the cervical contribution earlier in recovery tends to produce better outcomes than waiting months to identify it. The brain’s central compensation has the most plasticity in the early post-injury period, and removing the cervical obstacle to compensation during this window allows recovery to proceed more effectively. Patients with stalled recovery months or years after the original injury can still benefit from addressing the cervical component, but the trajectory is typically slower than when intervention occurs earlier.
Expected response pattern
When upper cervical correction produces improvement in post-concussion vestibular dysfunction, the response is typically gradual — over weeks to months as the central compensation proceeds more effectively with better proprioceptive input. Patients should not expect immediate resolution. The cervical correction removes one of the obstacles to recovery; the recovery itself takes the time it takes.
How an Upper Cervical Evaluation Works for Post-Concussion Patients
Upper cervical chiropractic focuses specifically on the precise structural relationship between the skull, atlas, and axis — the exact region most commonly injured alongside concussion. For post-concussion patients with significant cervical contribution, the evaluation can identify and address the structural problems contributing to persistent dysfunction.
Three-dimensional CBCT imaging
Cone beam computed tomography produces a true 3D reconstruction of the upper cervical anatomy and measures alignment to within fractions of a degree. Standard two-dimensional X-rays cannot reliably capture the small alignment changes that matter clinically — particularly the rotational and lateral components common in concussion-mechanism injuries. CBCT can.
Objective testing before any intervention
Leg length analysis measures functional postural asymmetry that reflects upper cervical misalignment. Paraspinal infrared thermography measures asymmetric autonomic activity along the cervical spine. Both tests are performed at every visit before any adjustment, and corrections are delivered only when objective findings indicate a structural shift. The principle of restraint guided by data is particularly important for post-concussion patients whose nervous systems are sensitized and whose tissues may be in various stages of healing.
Precision without manipulation
Corrections are specific to the upper cervical segment and delivered along a calculated vector. There is no twisting, no popping, no full-spine manipulation. The force is low. The motion is small. For post-concussion patients, this precision is essential. Aggressive cervical manipulation can aggravate the sensitized nervous system and is generally contraindicated in the post-concussion period. Precision-based correction respects the sensitivity that exists while still addressing the structural component.
When to Consider an Upper Cervical Evaluation After Concussion
An upper cervical evaluation is worth considering for post-concussion patients when any of the following are true:
Your concussion mechanism involved acceleration-deceleration forces — which describes essentially every concussion. Your cervical symptoms (neck pain, suboccipital tension, restricted cervical range of motion, cervicogenic headache pattern) have persisted beyond the acute phase. Your vestibular symptoms vary significantly with head or neck position. Your recovery has plateaued despite consistent engagement with standard post-concussion care. You have prior concussions or significant neck trauma layered on top of the current injury. Your concussion occurred in a whiplash context (motor vehicle accident, rear-end collision, sudden deceleration). You have developed post-traumatic vestibular migraine or other persistent post-concussion vestibular features. You want to ensure the structural cervical angle has been addressed alongside your standard concussion care.
These criteria describe the majority of concussion patients who develop persistent symptoms, reflecting the biomechanical reality that any acceleration-deceleration injury produces concurrent cervical injury alongside the brain injury. The evaluation can typically begin once acute medical stability has been established, generally within the first few weeks after concussion, alongside continuing engagement with comprehensive concussion care.
To find an upper cervical chiropractor near you, visit www.neckwise.com.
Where to Go From Here
Concussion is fundamentally a dual injury — the same forces that produce the brain injury produce upper cervical injury, and the resulting cervical structural problems can contribute substantially to the post-concussion vestibular dysfunction that affects approximately 30 percent of concussion patients chronically. The mechanism involves distorted cervical proprioceptive input to the vestibular nuclei, disrupted central compensation after the brain injury, trigeminocervical complex contributions to post-traumatic migraine, and other pathways that the brain-focused standard treatments do not specifically address.
The 2017 Berlin Consensus Statement explicitly acknowledges the cervicogenic contribution to persistent post-concussion symptoms, placing this framework firmly in mainstream concussion science. The challenge is that recognizing the contribution has not yet translated into routine evaluation of the cervical component in standard care. For patients with persistent post-concussion vestibular dysfunction — particularly those with persistent cervical symptoms, stalled recovery, or whose mechanism involved substantial rotational or whiplash forces — addressing the structural cervical contribution can produce improvement that comprehensive brain-focused treatment alone has not.
Upper cervical evaluation is appropriately complementary to standard post-concussion care, not a replacement for it. Vestibular rehabilitation, vision therapy, graded exercise rehabilitation, and other evidence-based components should remain the foundation of recovery. Addressing the cervical component fills a specific gap that those treatments do not specifically target.
To find an upper cervical chiropractor near you, visit www.neckwise.com.
References
- Iverson, G. L., Gardner, A. J., Terry, D. P., et al. (2017). Predictors of clinical recovery from concussion: A systematic review. British Journal of Sports Medicine, 51(12), 941–948.
- McCrory, P., Meeuwisse, W., Dvořák, J., et al. (2017). Consensus statement on concussion in sport — the 5th international conference on concussion in sport held in Berlin, October 2016. British Journal of Sports Medicine, 51(11), 838–847.
- Kaale, B. R., Krakenes, J., Albrektsen, G., & Wester, K. (2005). Head position and impact direction in whiplash injuries: Associations with MRI-verified lesions of ligaments and membranes in the upper cervical spine. Journal of Neurotrauma, 22(11), 1294–1302.
- Meaney, D. F., & Smith, D. H. (2011). Biomechanics of concussion. Clinics in Sports Medicine, 30(1), 19–31.
- Gdowski, G. T., & McCrea, R. A. (2000). Neck proprioceptive inputs to primate vestibular nucleus neurons. Experimental Brain Research, 135(4), 511–526.
- Kulkarni, V., Chandy, M. J., & Babu, K. S. (2001). Quantitative study of muscle spindles in suboccipital muscles of human foetuses. Neurology India, 49(4), 355–359.
- McLain, R. F. (1994). Mechanoreceptor endings in human cervical facet joints. Spine, 19(5), 495–501.
- Peng, B., Yang, L., Yang, C., Pang, X., Chen, X., & Wu, Y. (2022). Proprioceptive cervicogenic dizziness: A narrative review of pathogenesis, diagnosis, and treatment. Journal of Clinical Medicine, 11(21), 6293.
- Bartsch, T., & Goadsby, P. J. (2003). The trigeminocervical complex and migraine: Current concepts and synthesis. Current Pain and Headache Reports, 7(5), 371–376.
- Flanagan, M. F. (2015). The role of the craniocervical junction in craniospinal hydrodynamics and neurodegenerative conditions. Neurology Research International, 2015, Article 794829.
- Treleaven, J., Jull, G., & Sterling, M. (2003). Dizziness and unsteadiness following whiplash injury: Characteristic features and relationship with cervical joint position error. Journal of Rehabilitation Medicine, 35(1), 36–43.
This article is educational in nature and does not constitute medical advice, diagnosis, or treatment. Individual results vary. Chiropractic care focuses on the structure and function of the spine and nervous system. Patients with concussion or post-concussion symptoms should pursue appropriate medical evaluation and ongoing management — including vestibular rehabilitation, vision therapy, graded exercise rehabilitation, and other evidence-based concussion care — alongside any structural assessment. Upper cervical evaluation should typically occur once acute medical stability has been established. No claim is made or implied that upper cervical chiropractic cures or treats any specific disease.