• Source: Craniocervical instability

Craniocervical instability (CCI) is a medical condition characterized by excessive movement of the vertebra at the atlanto-occipital joint and the atlanto-axial joint located between the skull and the top two vertebra, known as C1 and C2. The condition can cause neural injury and compression of nearby structures, including the brain stem, spinal cord, vagus nerve, and vertebral artery, resulting in a constellation of symptoms.
Craniocervical instability is more common in people with a connective tissue disease, including Ehlers-Danlos syndromes, osteogenesis imperfecta, and rheumatoid arthritis. It is frequently co-morbid with atlanto-axial joint instability, Chiari malformation, or tethered spinal cord syndrome.
The condition can be brought on by physical trauma, including whiplash, laxity of the ligaments surrounding the joint, or other damage to the surrounding connective tissue.




Symptoms and signs


The impact of craniocervical instability can range from minor symptoms to severe disability in which patients are bed-bound. The constellation of symptoms caused by craniocervical instability is known as "cervico-medullary syndrome" and includes:

Anxiety disorder
Bobble-head doll syndrome, a sensation that the skull may fall off the cervical spine
Clumsiness and motor delay
Cognitive and memory decline
Double or blurred vision
Dysphagia, or the sensation of being choked
Dyspnea
Fatigue
Lhermitte's sign
Migraine headaches
Nausea
Neck, shoulder, and jaw pain
Occipital headaches
Orthostatic intolerance
Photophobia
Syncope
Tenderness at base of skull
Tinnitus
Tremors
Palpitations
Vertigo or dizziness
Weakness of limbs
Symptoms are frequently worsened by a Valsalva maneuver, or by being upright for long periods of time. The reason that being upright is problematic is that gravity allows increased interaction between the brain stem and the top of the spinal column, increasing symptoms.
Lying in the supine position can bring short-term relief. Lying supine eliminates the downward gravitational pull, reducing symptoms to some degree. Lying with the feet somewhat higher and head lower allows gravity can be helpful in symptom reduction.




Diagnosis


Craniocervical instability is usually diagnosed through neuro-anatomical measurement using radiography. Digital Motion X-ray is considered the most accurate method. Upright magnetic resonance imaging, supine magnetic resonance imaging, CT scan, and flexion and extension x-rays may also be used but are far less accurate and have a much higher potential for false negatives.
The measurements to diagnose craniocervical instability are:

Clivo-Axial Angle equal or less than 135 degrees
Grabb-Oakes measurement equal or greater than 9 mm
Harris measurement greater than 12mm
Spinal subluxation
Alternatively, craniocervical instability can be diagnosed if a trial of cervical traction, typically using a halo fixation device, results in a significant alleviation of symptoms.




Treatment


Conservative treatment of craniocervical instability includes physical therapy and the use of a cervical collar to keep the neck stable. Prolotherapy, including with stem cells, is a treatment option, but there is no scientific evidence supporting the success of this approach.
Cervical spinal fusion is performed on patients with more severe symptoms.




See also



Hypermobility spectrum disorder




References

Kata Kunci Pencarian:

• Craniocervical instability
• Dysautonomia
• Ehlers–Danlos syndrome
• Dizziness
• Klippel–Feil syndrome
• Myalgic encephalomyelitis/chronic fatigue syndrome
• CCI
• Smith's fracture
• Galeazzi fracture
• Segond fracture