[Post-traumatic unilateral atlanto-axial rotatory subluxation in an adult].

This retrospective single-patient case report deals with a rare form of spinal trauma, i.e. atlantoaxial rotatory subluxation. The authors present a review of the literature including a classification of rotatory atlantoaxial subluxation types proposed by Fielding, and describe their own experience with treatment of this condition. A case is reported of a 29-year-old woman with a history of head contusion in a car accident. Immediately after the trauma she had the following symptoms: torticollis and neck pain with decreased cervical motion. Atlantoaxial rotatory subluxation of the right C1-C2 articulation was diagnosed by plain radiographs and CT. The patient was treated surgically by an open reduction, unilateral screw fixation of the right CI-C2 articulation (according to Magerl) and posterior C1-C2 wiring with graft. The normal atlantoaxial relation was restored with disappearance of torticollis. At follow-up certain limitation of neck movements due to C1-C2 stabilization persisted. No complications were noted. The patient remains neurologically intact and has radiographic documentation of fusion.