title: Traumatic lumbosacral dislocation: report of two cases.
abstract: METHODS
  A retrospective study of 2 patients with traumatic lumbosacral dislocation.
  
  
  OBJECTIVE
  To discuss the difficulty in making diagnosis and the effect of surgical treatment.
  
  
  BACKGROUND
  Traumatic lumbosacral dislocation is an uncommon injury, which creates diagnostic difficulty and is typically managed by open reduction internal fixation of the lumbosacral spine.
  
  
  METHODS
  Medical notes and imaging of the 2 patients were reviewed.
  
  
  RESULTS
  Both patients were engaged in high-energy accidents and had concomitant injuries. Patient 1 was initially misdiagnosed as having L5 lytic spondylolisthesis and was treated with a lumbar corset. She developed progressive low back and left leg pain. Eleven months after the accident, a bilateral lumbosacral dislocation with right S1 superior facet fracture, disc rupture, posterior soft tissue disruption, and a resultant Grade 4 L5-S1 traumatic spondylolisthesis was identified. She underwent open reduction, followed by a staged anteroposterior spinal arthrodesis using instrumentation with excellent results. Patient 2 sustained a unilateral L5-S1 facet dislocation without neurologic deficit, which reduced spontaneously. The evaluation demonstrated a grossly disturbed posterior ligamentous complex adjacent to the lumbosacral articulation. A combined anteroposterior spinal fusion with instrumentation was performed with favorable outcome.
  
  
  CONCLUSIONS
  Meticulous clinical examination and careful imaging assessment, including CT and MRI, assist an early diagnosis in cases of lumbosacral dislocation. Open reduction and circumferential bony fusion restore segmental stability and painless function.
authors.affiliation: Department of Spinal Surgery, Royal National Orthopaedic Hospital NHS Trust, Middlesex, UK. atsirikos@hotmail.com
authors.forename: Athanasios I
authors.initials: AI
authors.lastname: Tsirikos
authors.forename: Asif
authors.initials: A
authors.lastname: Saifuddin
authors.forename: M Hilali
authors.initials: MH
authors.lastname: Noordeen
authors.forename: Stewart K
authors.initials: SK
authors.lastname: Tucker
mesh_terms: D000063:Accidents, Traffic; D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D017116:Low Back Pain / Q000209:etiology; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008161:Lumbosacral Region; D008279:Magnetic Resonance Imaging; D008297:Male; D012189:Retrospective Studies; D016103:Spinal Fractures / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D013123:Spinal Fusion / Q000295:instrumentation / Q000379:methods; D013168:Spondylolisthesis / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014947:Wounds and Injuries / Q000150:complications*; D021801:Zygapophyseal Joint / Q000473:pathology