title: Intraspinal metallosis causing delayed neurologic symptoms after spinal instrumentation surgery.
abstract: METHODS
  Two cases of intraspinal metallosis causing delayed neurologic symptoms secondary to spinal instrumentation surgery are reported.
  
  
  OBJECTIVE
  To present an unusual delayed neurologic complication after spinal instrumentation surgery.
  
  
  BACKGROUND
  Metal-related complications caused by orthopedic implants have long been a concern in the field of arthroplasty or internal fixation of fractures, but no such complications have been reported for spinal instrumentation.
  
  
  METHODS
  Retrospective case report of two patients with degenerative scoliosis who presented with delayed neurologic symptoms months to years after uneventful, but without secondary degenerative changes or dislodgement of the implants.
  
  
  RESULTS
  In both reported cases, a granulation-tissue mass characterized by marked metallosis had been formed in the spinal canal adjacent to a loosened laminar hook.
  
  
  CONCLUSIONS
  Intraspinal metallosis should be kept in mind as a rare cause of delayed neurologic symptoms after spinal instrumentation surgery. With the metal implants in place, myelography was the sole informative examination for diagnosis.
authors.affiliation: Service d'Orrthopédie, Centre Hospitalier Universitaire de Nantes, France.
authors.forename: S
authors.initials: S
authors.lastname: Takahashi
authors.forename: J
authors.initials: J
authors.lastname: Delécrin
authors.forename: N
authors.initials: N
authors.lastname: Passuti
mesh_terms: D001416:Back Pain / Q000209:etiology; D001863:Bone Screws / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000473:pathology / Q000601:surgery*; D008670:Metals / Q000009:adverse effects*; D008875:Middle Aged; D009422:Nervous System Diseases / Q000209:etiology; D011183:Postoperative Complications; D012600:Scoliosis / Q000601:surgery*
chemical_list: D008670:Metals