Cervicogenic Headache

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Definition/Description

A chronic headache that arises from the atlanto-occipital and upper cervical joints and perceived in one or more regions of the head and/or face. These occur due to a neck disorder or lesion and feature the converging of trigeminal and cervical afferents in the trigeminocervical nucleus within the upper cervical spinal cord. By definition the headache should be abolished following a diagnostic blockade of a cervical structure or its nerve supply.

The International Headache Society (IHS) has validated cervicogenic headache as a headache type that is hypothesized to originate due to nociception in the cervical area.

Cervicogenic Headache

Upper Cervical Spine

Clinical relevant anatomy

The cervical spine consists of 7 vertebrae, C1 to C7. The cervical nerves from C1 to C8. The first two vertebrae have a unique shape and function.3 The upper vertebrae supports the skull, articulates superiorly with the occiput (the atlanto-occipital joint) and is named the atlas (C1). This joint is responsible for 50% of flexion and extension.5 The design of the atlas allows forward and backward movement of the head. Among the atlas is the axis (C2) that allows rotation.3 The atlantoaxial joint is responsible for 50% of all cervical rotation. Both form the upper cervical spine. The 5 cervical vertebrae that make up the lower cervical spine, C3-C7, are similar to each other but very different from C1 and C2.5 (Figure 1)
Intervertebral discs are located between the vertebral bodies of C2-C7. These disks are composed of 4 parts: the nucleus pulposus in the middle, the annulus fibrosis surrounding the nucleus, and 2 end plates that are attached to the adjacent vertebral bodies. They serve as force dissipators, transmitting compressive loads throughout a range of motion. The disks are thicker anteriorly and therefore contribute to normal cervical lordosis. The intervertebral disks are involved in cervical spine motion, stability, and weight-bearing.5

The most important muscles that are totally or partially located cervical are:4 (figure3)

Erector spinae, upper Extension, rotation C1–T1
Longus capitis Flexion C1–C3
Longus colli Flexion C2–C6
Rectus capitis anterior Flexion C1–C2
Rectus capitis lateral Flexion C1–C2
Scalenes Flexion, rotation C4–C8
Semispinalis capitis Extension, rotation C1–T1
Semispinalis cervicis Extension, rotation C1–T1
Splenius capitis Extension, rotation C1–C8
Splenius cervicis Extension, rotation C1–C8
Sternocleidomastoid Flexion, rotation C2, XI
Trapezius, upper Extension, rotation C3-C4
Levator scapula Elevatie scapula C3-C5
Rhomboideus minor Retrotractie scapula + fixation C4-C5

The most important ligaments that are totally or partially located cervical are:4,5 (figure 2)
Alar Axis-skull head rotation & lateral flexion
Anterior atlantoaxial Axis & atlas extension
Posterior atlantoaxial Axis & atlas flexion
Ligamentum nuchae cervical flexion
Anterior longitudinal Axis-sacrum Extension
Posterior Longitudinal Axis-sacrum Flexion
Ligament flavum Axis-sacrum flexion

The mechanism which is responsible for the pain consists of a merger of the spinal nerves C1, C2 and C3, and a branch of the 5th cranial nerve, the n. trigeminal. This merger of nerves makes it possible that upper cervical pain radiate to regions of the head which are innervated by the cervical nerve (auricular and occipital). The merger with the trigeminal afferents allows the pain to radiate to the parietal, frontal and orbital regions.1,2,11

Epidemiology/Etiology

Of all chronic headaches, the incidence of cervicogenic headache has been estimated to be 14-18%, though in a recent population-based study a 2.2% prevalence was found. As such, it is important we can distinguish cervicogenic headache from the other headaches like migraine, tension type headache.

The term cervicogenic headache (CGH) was coined almost 3 decades ago, and the general condition of pain located in the head but originating in the cervical spine was described over 100 years ago. It is similar to other non-specific spinal conditions in its relative lack of high level evidence regarding pathoanatomical etiology. Since there is no objective test set for diffinitive diagnosis of CGH, the condition is ruled in, and treatment chosen, based on the patient's subjective report of pain patterns. 

There is some evidence that multiple structures in the upper cervical spine can be the source that is referring pain into the head. The implicated structures are generally centered around C1, C2, and C3 spinal levels. This may include the joints, disc, ligaments, and musculature. The lower cervical spine may play an indirect role in pain production if dysfunctional, but there is no evidence of a direct referral pattern. Through controlled nerve blocking of various structures in the cervical spine, it appears that the zygoapophyseal joints, especially those of C2/C3, are the most common sources of CGH pain. This finding is even more common in patients with a history of whiplash.

Characteristics/Clinical Presentation

Challenging to diagnose clinically, but often includes the below:

• Unilateral “ram’s horn” or unilateral dominant headache
  • Excluding those with bilateral headache or symptoms that typify migrane headaches
• Exacerbated by neck movement or posture
• Tenderness of the upper 3 cervical spine joints
• Association with neck pain or dysfunction
  
• Definitive diagnosis made through selective nerve blocking through injection of specific sites
• Compared to migraine headache and control groups, cervicogenic headache group patients tend to have increased tightness of upper trapezius, levator scapulae, scales and suboccipital extensors
  

Differential Diagnosis

Type	Location	Intensity	Frequency	Duration	Additional Symptoms
Cluster	Unilateral: (orbital, supraorbital, temporal)	Severe	1x every other day -> 8x day	15-180 minutes	Associated with ipsilateral: conjunctival injection, lacrimation, nasal congestion, rhinorrhoea, forehead and facial sweating, miosis, ptosis, eyelid edema. Restlessness or agitation.
Tension	Bilateral	Mild-Moderate	>15day/mo, >3 mo	Hours-continuous	Pressing, tightening <1 of photophobia, phonophobia or mild nausea
Migraine without aura	Unilateral: Frontotemporal in adults, Occipital in children	Moderate-Severe	>14 days/month	4-72 hours	Flickering lights/spots in vision, pulsating quality, nausea, photophobia, phonophobia

For more detailed classification information

Cluster	Tension	Migrane

Cybex Dynamometry

Another possibility to distinguish cervicogenic headache from migraine and tension headache is the use of a Cybex dynamometry. Testing using Cybex dynamometry has shown that the ranges of cervical flexion, extension and rotation are significantly less in patients with cervicogenic than in patients with migraine and tension type headache (p < 0.001). Investigators also found that tenderness is a factor that varies between patients with CGH and patients with migraine or tension type headaches. Bovim measured pressure pain thresholds at ten points on the head and suboccipital region in patients with CGH, tension type headache and migraine. Lower scores were found in patient with cervicogenic headaches than without.

Examination

Diagnostic Criteria (as described by the IHS):

1. Pain localized in the neck and occiput, which can spread to other areas in the head, such as forehead, orbital region, temples,vertex, or ears, usually unilateral.
2. Pain is precipitated or aggravated by specific neck movements or sustained postures.
3. At least one of the following:
   1. Resistance to or limitation of passive neck movements
   2. Changes in neck muscle contour, texture, tone, or response to active and passive stretching and contraction
   3. Abnormal tenderness of neck musculature
4. Radiological examination reveals at least one of the following:
   1. Movement abnormalities in flexion/extension
   2. Abnormal posture
   3. Fractures, congenital abnormalities, bone tumors, rheumatoid arthritis, or other distinct pathology (not spondylosis orosteochondrosis)
      

Flexion-Rotation Test Sn = 0.91, Sp = 0.90

The inverse relationship between headache severity of CGH and ROM towards the most restricted side for the Cervical Flexion-Rotation Test (FRT) was statistically significant for all patients with cervicogenic headaches. The patient should feel no pain at the time of the test. During this test, the neck of the patient is passively held in end range flexion. The therapist rotates the neck to each side until they feel resistance or until the patient says they are in pain. At this end point, the therapist makes a visual estimate of the rotation range and says on which side the FRT was positive or negative. The test was positive when the estimated range was reduced by more than 10° from the anticipated normal range (44°).

"Red flags"

1. Sudden onset of a new severe headache;
2. A worsening pattern of a pre-existing headache in the absence of obvious predisposing factors;
3. Headache associated with fever, neck stiff ness, skin rash, and with a history of cancer, HIV, or other systemic illness;
4. Headache associated with focal neurologic signs other than typical aura;
5. Moderate or severe headache triggered by cough, exertion, or bearing down; and
6. New onset of a headache during or following pregnancy.

Patients with one or more red flags should be referred for an immediate medical consultation and further investigation.

Medical Management (current best evidence)

The failure to conclusively demonstrate a specific disease or dysfunction of the neck in relation to cervicogenic headache has been an impediment to specific treatment for individuals with the diagnosis.

Cervical epidural steroid injections: Indicated for multilevel disc or spine degeneration

Nerve Blocks: Disrupting the cascade of signals leading to sensitization to central mechanisms via:

• Nerve blocks
• Trigger point injections
• Radiofrequency thermal neurolysis

Current best evidence suggests that there is not sufficient evidence meeting the EBM criteria to support the use of RF facet denervation for cervicogenic headaches.

Surgical interventions: Often only provide temporary relief with the possibility of longer intensification of pain. Procedures Include:

• Neurotomy
• Dorsal rhizotomy
• Microvascular decompression of nerve roots

Other Medications:

Tricyclic antidepressants - Used at lower dosage than required for pts diagnosed with depression

Muscle relaxants - Related to the CNS, may be beneficial, evidence is still pending

Botulinum toxin - A neurotoxin injected into tender muscles to reduce hypertonia

Physical Therapy Management (current best evidence)

The preferred practice pattern for cervicogenic headache is 5D: Impaired Motor Function and Sensory Integrity Associated with Nonprogressive Disorders of the Central Nervous System-Acquired in Adolescence or Adulthood. Goodman states that "Although this type of headache is responsive to therapy oriented at treating the soft tissue restrictions, the method of examination, assessment, and treatment needs to be specific to the neck and occiput."

Treatment

• Cervical spine manipulation or mobilization
• Strengthening exercises
  • Deep neck flexors
  • Upper quarter muscles
• Thoracic spine thrust manipulation & exercise
• C1-C2 Self-sustained Natural Apophyseal Glide (SNAG)
  • shown to be effective for reducing cervicogenic headache symptoms
    

Jull et al reported that a six week physiotherapy program including manual therapy and exercise interventions was an effective treatment option for reduction of cervicogenic headache symptoms and decreasing medication intake in both the short term and at one-year follow-up.

Outcome Measures

• Neck_Disability_Index
• Headache Disability Index
• Northwick Park Neck Pain Questionnaire
• Numeric Pain Rating Scale
• Pain visual analog scale
• Headache frequency and duration

Treatment Examples

Seated CT Manipulation	Seated Mid Thoracic Manipulation
Deep Neck Flexor Exercises
Middle Trapezius Strengthening	Lower Trapezius Strengthening

Key Research

1. Jull G, Stanton W. Predictors of responsiveness to physiotherapy management of cervicogenic headache. Cephalalgia. 2005;25:101-108.
2. Hall T et all. Clinical Evaluation of Cervicogenic Headache: A Clinical Perspective. Journal of Manual and Manipulative Therapy. 2008;16:73-80.

Resources

1. International Headache Society
2. Diagnosis and management of cervicogenic headache. Sizer PS Jr, Phelps V, Azevedo E, Haye A, Vaught M. Pain Pract. 2005 Sep;5(3):255-74.
3. The diagnostic validity of the cervical flexion-rotation test in C1/2-related cervicogenic headache. Ogince M, Hall T, Robinson K, Blackmore AM. Man Ther. 2007 Aug;12(3):256-62.
   
4. Efficacy of a C1-C2 self-sustained natural apophyseal glide (SNAG) in the management of cervicogenic headache. Hall T, Chan HT, Christensen L, Odenthal B, Wells C, Robinson K. J. Orthop Sports Phys Ther. 2007 Mar;37(3):100-7.
5. Clinical evaluation of cervicogenic headache: a clinical perspective. Fernández-de-Las-Peñas C. J Man Manip Ther. 2008;16(2):81.
   

Recent Case Studies

1. J Man Manip Ther. 2007;15(1):10-24.
2. van Duijn J, van Duijn AJ, Nitsch W. Orthopaedic manual physical therapy including thrust manipulation and exercise in the management of a patient with cervicogenic headache: a case report.

Clinical Bottom Line

Cervicogenic headaches are brought on by neck dysfunction and present in a unilateral "ram’s horn" pattern. The flexion-rotation test is a diagnostic method with high sensitivity and specificity that assists in differentiating it from other types, such as migraines, tension, and cluster headaches. PT treatment should include cervical mobilization, cervical or thoracic thrust manipulation, and deep neck flexor and upper quarter strengthening.

Recent Related Research (from Pubmed)

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