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”Cock-robin” position in atlantoaxial dislocation

Anterior (A) and posterior (B) views of a child with “cock-robin” position. Note the rotation of the head to the right and the head tilt towards the left shoulder resulting from rotatory atlantoaxial dislocation. In this case the left-sided C1 facet has moved forward relative to the left-sided C2 facet, moving C1 forward and rotating to the right. (Contributed by Dr. David Choi.)

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Associated Disorders

  • Ankylosing spondylitis
  • Chiari malformation
  • Cleidocranial dysplasia
  • Down syndrome
  • Ehlers-Danlos type IV
  • Grisel syndrome
  • Head and neck infection
  • Inflammatory arthritides
  • Marfan disease
  • Morquio syndrome (mucopolysaccharidosis type IV)
  • Primary cervical dystonia
  • Reiter syndrome
  • Systemic lupus erythematosus
  • Trauma
  • Tuberculosis
  • Tuberculous spondylitis