Simple atlantoaxial dislocation

Simple atlantoaxial dislocation belongs to rotational subluxation, which has been described by Coutts (1908, 1934) and Fielding (1977). The essence is that the lateral mass of the first cervical spine is displaced above the lateral mass of the second cervical spine. From a dynamic observation, it is shown that the first cervical spine is separated and rotated about the tooth process of the second cervical spine. Simple atlantoaxial dislocations are mostly clinically asymptomatic, so they are easily overlooked and missed.

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