[Spontaneous anterior atlanto-axial subluxation--a case story]

In this study, a case of 4.5 years' old girl with spontaneous dislocation of C1/C2 vertebrae probably due to congenital defect of C1-hypoplasia of the atlas anterior arch is presented. Treatment consisted of skull traction and slow reposition followed by surgical spinodesis C1 and C2. During examination after 1 year follow up period, patient was in good clinical condition, without any complaints. On radiograms the cervical spine was stable and of correct shape.