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Journal of Medical Cases

Case Report

Volume 12, Number 11, November 2021, pages 451-454

Cervicogenic Dizziness Associated With Craniocervical Instability: A Case Report

Cervicogenic dizziness (CGD) is a clinical syndrome characterized by an illusory sensation of motion and disequilibrium secondary to neck pathologies [1, 2]. Although the etiology remains unknown, many cases of CGD have been associated with post whiplash injury, inflammatory, degenerative, or mechanical dysfunctions of the cervical spine [1]. It has been proposed that a disruption of the normal afferent signals or aberrant pain signals may affect the upper cervical proprioceptors to the vestibular nucleus resulting in disequilibrium in cases of CGD [1, 3]. There is no standardized test for CGD. However, there are diagnostic criteria that may help to identify CGD: 1) The presence of neck pain before or at the same time of feeling dizzy [2, 4]; 2) Successful management of cervical dysfunction leads to a simultaneous relief of dizziness [5]. The correlation between dizzy syndrome and neck movement is an explicit diagnostic criterion for CGD [2, 4]. Often, clinical features are blurred and diagnostic clues are subtle to be seen on imaging. An uncommon case of CGD associated with craniocervical instability (CCI) is reported here. Excellent functional and radiographic outcome was achieved through non-operative measures.

A 40-year-old male radio presenter was evaluated for episodic spinning dizziness with aural fullness, tinnitus, and sudden hearing loss frequently affecting the right ear in the past 12 months. He also complained of chronic neck pain and occipital headache. He reported that episodes developed three times per week on average and caused spinning sensation of the room, lasting 2 - 3 h. Episodes could sometimes be triggered by quick turning of the head, closing the eyes, or texting on a smartphone. The symptoms worsened in the evening and could be lessened by simply lying down. The patient was unable to host radio programs or carry out daily tasks as before, and this was why he sought medical help.

On previous neuro-otologic evaluation, tuning fork evaluation identified asymmetrical hearing loss. An audiogram confirmed a sensorineural hearing loss in the right ear. No pathologies of the auditory system were detectable. Blood tests, brain magnetic resonance imaging and neurological investigations did not show any abnormality. Based on the 2020 clinical practice guideline [6] (i.e., two vertiginous episodes with sensorineural hearing loss and fluctuating aural symptoms in the affected ear, after exclusion of other causes) our patient was diagnosed with Meniere’s disease by his otolaryngologist 4 months before he came to our clinic. Over the next 4 months the patient received oral betahistine to increase cochlear blood flow and reduce pressure in the endolymphatic space, diet modification, and vestibular rehabilitation provided by a physiotherapist. The severity of dizziness and the attacks frequency did not change. The patient presented for chiropractic assessment.

On physical examination, the patient showed limited range of cervical motion (40°/70° active extension and 60°/90° of bilateral rotation). The self-reported peak pain intensity of his neck pain and headache was 7/10 on an 11-point numeric pain rating scale, where 0 means no pain and 10 means the worst imaginable pain [7]. The Dizziness Handicap Inventory (DHI) questionnaire was scored at 68/100 (mild, 0 - 30; moderate, 31 - 60; and severe, 61 - 100) [8]. During the palpation, the patient reported tenderness at the C2/3, C5/6, C7/T1 and T5/6 levels, and hypertonicity noted in bilateral upper trapezius, levator scapulae, supraspinatus, and pectoralis muscles. Other orthopedic, neurological, and neurodynamic tests were unremarkable. Cervical radiograph (Fig. 1a) showed a lack of cervical lordosis and narrowing of the C2/3, C5/6 and C7/T1 intervertebral spaces. The clivo-axial angle (CXA) [9], the angle between the posterior axial line and the clival line, was dissociated (curved red arrow in Figure 1a). The fulcrum effect at the tip of the dens might predispose the brainstem to impingement during neck motions. Ventral brainstem compression secondary to CCI was considered as the cause of CGD.

Click for large image

Figure 1. Comparison of cervical alignment on sagittal radiographs in neutral position. (a) At initial assessment, a lack of cervical lordosis, narrowing of the C2/3, C5/6 and C7/T1 intervertebral spaces, and dissociation of the clivo-axial angle (CXA) were noticed (curved red arrow). The fulcrum effect at the tip of the dens might predispose the brainstem to impingement during neck motions. (b) At 12-month follow-up, all radiographic metrics showed significant improvement, including correction of the dissociated CXA, cervical curvature and other postural parameters (global lordosis angle, craniovertebral angle, head inclination and shifting of the cervical gravity line). Restored CXA and cervical alignment yielded simultaneous remission of neurological symptoms.

The CXA varies from 150° to 165° in neutral position among adults [9]. An acute CXA of less than 150° or being deformed like this case can be a source of ventral brainstem compression. Normalizing the CXA to reduce ventral brainstem compression is of paramount importance [10]. Although surgery is the direct procedure for removing neural compression, conservative strategy is the mainstay of initial care for patients with small amounts of CCI [11]. Conservative modalities for CCI include resting, pain relief, bracing, physiotherapy and spinal manipulation [12]. Non-surgical strategy for this case was based on a multicomponent approach which included: 1) Spinal manipulation to release the restricted cervical and thoracic levels; 2) Thermal ultrasound therapy to relieve muscle stiffness and restore motion; and 3) Cervical intermittent motorized traction to restore intervertebral spaces and decompress neural impaction. Treatment sessions were arranged three times a week for 3 months.

One month after starting treatment, the patient reported significant reduction of neck and head pains from 7/10 to 2/10 on an 11-point numeric pain rating scale. DHI score declined from 68/100 to 20/100. Meanwhile, the patient reported that dizziness attacks had diminished from an average of three times to once weekly. In the next 2 months, he reported a reduction of the episodes of hearing lose, tinnitus, and perception of aural fullness gradually week by week. After the 3-month intensive treatment, the patient continued a maintenance treatment twice monthly for the next 9 months.

At the 12-month follow-up, the patient was symptom free and his clinical metrics showed significant improvement. The patient reported neck pain reduced to 0/10 on pain rating scale, the DHI score declined (0/100) and resolution of aural symptoms. The CXA had been restored (Fig. 1b). The cervical curvature and other postural parameters (global lordosis angle, craniovertebral angle, and shifting of the cervical gravity line) have been improved. These changes led to restoring the craniocervical stability which was positively reflected as well on other outcomes such as neck pain, cervical mobility and quality of life. The patient perceived the treatment with high satisfaction. No adverse events had occurred during the 12 months of care.

The neck has a well-developed proprioceptive system [13]. These cervical proprioceptive inputs give significant somatosensory feedback maintaining postural balance [5]; and impairment of the cervical proprioception can cause a sensation of disequilibrium [2]. Various neck problems such as post whiplash injury, muscular fatigue, or cervical spondylosis can compromise this proprioceptive system and result in CGD [14]. Other postulated mechanisms responsible for producing the feeling of disequilibrium include compression of the vertebrobasilar artery, irritation of the cervical sympathetic nervous system, and aberrant pain signals from the upper cervical spine [15, 16].

CGD may cause dizzy symptoms similar to those of Meniere’s disease. It has been assumed that CGD does not include aural symptoms like Meniere’s disease [1]. However, recent studies demonstrated an association between cervical spine diseases and occurrence of aural dysfunctions manifesting as hearing loss, vertigo, and tinnitus [17, 18]. A pilot study assessed aural symptoms among 42 neck pain patients showed a significant relationship between hearing loss and restricted range of cervical motion [17]. Another study of 60 participants suffering from cervical spondylosis further demonstrated a direct relation between the restricted side of cervical rotation and the affected side of hearing impairment [18]. Our patient had neck pain and a limitation of the cervical extension and bilateral rotation. Various mobility restrictions in the upper neck can lead to hearing impairment due to ear vessels and or nerves compromise [17].

CCI is a manifestation of ligamentous laxity between the skull and the first two cervical vertebrae, the atlas and the axis [19].The major ligaments involved are the alar, transverse and accessory ligaments. The line of reasoning that, anterolisthesis of the destabilized cranium on the cervical spine resulted in a backward displacement of the dense (the odontoid process of the axis), which might compress the brainstem or upper cervical cord, stretch the vertebral artery, and possibly alter venous or cerebrospinal fluid (CSF) outflow from the cranium [20]. Repetitive strain on the spinal cord/brainstem creates inflammatory edema which could cause irritation of the lower cranial nerves and dysfunction of the adjacent auditory organs [21].

Among the most frequently used landmarks to define the anatomic structure of the craniocervical junction are the clivus and axis [22]. The angle formed at the intersection of the clivus baseline with the posterior axial line is called the CXA [9, 20]. Angular measurements relative to these structures are influenced by bony orientation, integrity of various ligaments, and paraspinal musculature [22]. The CXA is a useful index for healthcare providers to alert of the presence of CCI or brainstem compression [9]. A distorted CXA with the fulcrum effect at the tip of the dens can predispose the ventral brainstem to compression during neck motions (Fig. 1a). Recent studies have demonstrated the salutary consequences following surgical correction of the deformed CXA [9, 19].

Recent systematic reviews [23, 24] found a moderate clinical evidence to support the use of manual therapy to treat patients with CGD. In general, the studies reported significant reduction in dizziness intensity due to manual therapy as an intervention to treat CGD [24]. As seen in the current case, restoration of CXA and cervical alignment with simultaneous remission of clinical symptoms verified the diagnosis of CGD. It is possible that nonsurgical approaches could strengthen neck musculature, unload restricted structures, release neural irritation and restore spinal function [25]. However, it is often difficult to generalize results from a single case to a larger population. Further studies are required to corroborate this issue and to follow the patients’ long-term outcomes.

The current study reported an association between CGD and CCI. The misalignment of craniocervical junction places stress on the brainstem and causes it to send confusing signals to the brain resulting in disequilibrium. The neurologic symptoms have been shown to correlate with CXA deformity and respond to the correction of clivo-axial misalignment.

Acknowledgments

None to declare.

Financial Disclosure

None to declare.

Conflict of Interest

None to declare.

Informed Consent

Written informed consent was obtained from the patient for case publication.

Author Contributions

E. ChunPu Chu was mainly involved in diagnosis and treatment of this patient. F. Al Zoubiand and J. Yang drafted the report. All authors read and critically reviewed the manuscript, and then approved the final submitted version.

Data Availability

The authors declare that data supporting the findings of this study are available within the article.

Abbreviations

CCI: craniocervical instability; CGD: cervicogenic dizziness; CXA: clivo-axial angle

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