title: Extrusion of expandable stacked interbody device for lumbar fusion: case report of a complication.
abstract: METHODS
  A case report.
  
  
  OBJECTIVE
  We report on the device failure of a polyetherether-ketone expandable cage device with posterior migration of one of its components.
  
  
  BACKGROUND
  Posterior migration of transforaminal lumbar interbody fusion cage devices has been reported with static devices, and ours is the first report of an expandable TLIF device failure and posterior migration of one of its components.
  
  
  METHODS
  The patient is a 30-year-old man who had previously failed 3 lumbar surgical procedures and presented for L5-S1 lumbar fusion with pedicle screws and transforaminal interbody fusion.
  
  
  RESULTS
  Postoperative imaging demonstrated posterior migration of one of the failed expandable interbody components with eventual revision surgery and placement of static transforaminal lumbar interbody fusion cages.
  
  
  CONCLUSIONS
  This is the first case report to describe such complication, and caution must be warranted when using these devices.
authors.affiliation: Spine Institute of San Diego, San Diego, CA, USA.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Kim
authors.forename: Eli M
authors.initials: EM
authors.lastname: Baron
authors.forename: Michel
authors.initials: M
authors.lastname: Levesque
mesh_terms: D000328:Adult; D001863:Bone Screws; D004868:Equipment Failure; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging / Q000209:etiology; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D009984:Orthopedic Fixation Devices; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000209:etiology; D011859:Radiography; D012447:Sacrum / Q000000981:diagnostic imaging / Q000601:surgery; D013123:Spinal Fusion / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods