Atlantoaxial instability Subluxation

Atlantoaxial instability
  • Facts:
    Malformation seen in 10-15% of Down's syndrome patients

    Most commonly due to excessive laxity in the posterior transverse ligament, which causes increased mobility between the atlas (C1) and the axis (C2)
  • History / PE:
    Behavioral changes
    Toricolis
    Urinary incontinence
    Vertebrobasiliar symptoms (dizziness, vertigo, diplopia)
    Upper motor neuron symptoms (leg spasticity, positive Babinski)
  • Diagnosis:
    Lateral radiographs
  • Treatment:
    Surgical fusion of C1 and C2
  • Associated With:
    Down's syndrome



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August 6th 2010