title: Congenital C1-2 Lateral Translational Dislocation: Case Illustration with Pre- and Postoperative Imaging.
abstract: BACKGROUND
  Congenital atlantoaxial dislocation has been commonly described in the antero-posterior or vertical plane (basilar invagination). However, dislocation in the lateral translational plane due to congenital deformity is rare.
  
  
  METHODS
  We present a case of a young male who presented with os odontoideum with C1-2 dislocation in the lateral plane along with antero-posterior dislocation. He was operated on through a midline posterior incision, and the C1-2 facet was manipulated so as to correct the dislocation in all planes.
  
  
  CONCLUSIONS
  With os odontoideum, the C1-2 joints can exhibit movements that are out of the ordinary, even in the lateral translational plane. It suggests that the ligaments and joint capsule may weaken with time. Careful radiological evaluation helps in diagnosing this rare condition. An understanding of 3D facetal anatomy is important to achieve complete correction.
authors.affiliation: Department of Neurosurgery, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.
authors.forename: Pravin
authors.initials: P
authors.lastname: Salunke
authors.forename: Sushanta K
authors.initials: SK
authors.lastname: Sahoo
authors.forename: Arsikere N
authors.initials: AN
authors.lastname: Deepak
authors.forename: Ravi
authors.initials: R
authors.lastname: Garg
mesh_terms: D000293:Adolescent; D001268:Atlanto-Axial Joint; D002574:Cervical Vertebrae / Q000473:pathology*; D006801:Humans; D004204:Joint Dislocations; D008297:Male; D009068:Movement; D011184:Postoperative Period; D035583:Rare Diseases; D013123:Spinal Fusion