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Craniocervical Instability Adelaide

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Overview

Craniocervical instability (CCI) refers to excess movement at the junction where the skull meets the spine, which can threaten spinal cord safety and cause various neurological and pain-related symptoms. Diagnosis is based on clinical evaluation and specialised imaging. Treatment ranges from conservative stabilisation to surgical fusion.

Symptoms

  • Neck pain and stiffness, often at the base of the skull.
  • Headaches (occipital or vertex); may worsen with certain head positions or movements.
  • Dizziness, vertigo or feeling of imbalance.
  • Visual disturbances or blurred vision with certain movements.
  • Brain fog, difficulty concentrating or memory problems.
  • Tinnitus (ringing in the ears) or hearing disturbances.
  • Upper extremity pain, numbness or weakness.
  • Fatigue and reduced exercise tolerance.
  • Symptoms often worsen with activities that move or stress the neck.

Causes

  • Ligamentous laxity: weakening or elongation of ligaments supporting the craniocervical junction.
  • Traumatic injury: whiplash or head injury damaging stabilising structures.
  • Connective tissue disorders: Ehlers-Danlos syndrome, Marfan syndrome and other conditions affecting ligament integrity.
  • Degenerative changes: arthritis and disc degeneration at the occipitocervical level.
  • Anatomical variants: some individuals have inherent anatomical predisposition to instability.

Diagnosis

Diagnosing CCI can be challenging due to symptom overlap with other conditions.

  • Clinical assessment: detailed history, examination of neck mobility, stability testing, neurological assessment.
  • Static MRI: high-resolution imaging of the craniocervical junction, brainstem and upper cervical cord.
  • Dynamic MRI or CT: specialised imaging with the neck in flexion-extension to assess movement and instability; essential for diagnosis.
  • Plain X-rays and flexion-extension views: may show excessive motion.
  • Measurements: specialised radiographic measurements (e.g. basion-dens interval, clivo-axial angle) aid diagnosis.
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Non‑surgical treatment

For mild to moderate instability without significant neurological compromise, conservative management is first-line.

  • Cervical collar or orthosis: rigid or semi-rigid support to limit excessive motion; worn during activities and possibly at night.
  • Postural training and stabilisation: exercises focusing on gentle neck stabilisation without loading; avoid high-impact or neck-stressing activities.
  • Physical therapy: carefully tailored to support rather than mobilise the hypermobile joint.
  • Activity modification: avoiding movements that worsen symptoms; careful pacing of activities.
  • Pain management: NSAIDs, muscle relaxants and neuropathic pain medicines as needed.

Conservative care requires commitment and may need to be continued long-term.

Surgical treatment

Surgery is considered when conservative care fails, when instability threatens the brainstem or spinal cord, or when there is progressive neurological decline.

  • Occipitocervical fusion (C0-C2 or C0-C3): fusion of the skull base to upper cervical spine to stabilise the craniocervical junction.
  • Atlantoaxial fusion (C1-C2): fusion of the atlas and axis for instability isolated to this level.
  • Occipitothoracic fusion (C0-T2 or beyond): extended fusion if more extensive instability is present.
  • Modern techniques: image-guided, minimally invasive approaches and newer instrumentation designs aim to improve outcomes and reduce complications.

Timing of surgery is important; earlier intervention may prevent irreversible brainstem or spinal cord damage.