title: Intermittent distracting rod for correction of high neurologic risk congenital scoliosis.
abstract: METHODS
  Report of three cases of severe congenital scoliosis corrected by a new device.
  
  
  OBJECTIVE
  To show a new, safe alternative for treatment to achieve and maintain correction of the most severe spinal deformity.
  
  
  BACKGROUND
  Because of neurologic risk, severe congenital scoliosis is usually not instrumented. Gradual correction seems to be safer for the spinal cord and to produce more efficient results because of the viscoelastic properties of the spine.
  
  
  METHODS
  A new device was used in three patients with congenital scoliosis. This device is placed by a posterior approach and permits correction of the scoliosis by slow, intermittent distraction. The gear of the elongation mechanism is activated by an extender placed subcutaneously. The correction takes place in the conscious patient, under rigorous neurologic control.
  
  
  RESULTS
  At the end of the distraction procedure, corrections of the scolioses in the three patients were from 118 degrees to 45 degrees, 104 degrees to 47 degrees, and 137 degrees to 71 degrees, respectively
  
  
  CONCLUSIONS
  The new device has proved useful for correcting, efficiently and without neurologic damage, severe scoliosis in three patients, and may be helpful in those curves with high neurologic risk.
authors.affiliation: Spinal Surgery Department, Hospital Luis Calvo Mackenna, Hospital Clínico Universidad de Chile Jose Joaquin Aguirre, Santiago, Chile.
authors.forename: P J
authors.initials: PJ
authors.lastname: Grass
authors.forename: A V
authors.initials: AV
authors.lastname: Soto
authors.forename: H P
authors.initials: HP
authors.lastname: Araya
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D009422:Nervous System Diseases; D009984:Orthopedic Fixation Devices / Q000009:adverse effects; D011859:Radiography; D012600:Scoliosis / Q000151:congenital* / Q000000981:diagnostic imaging / Q000601:surgery*; D013131:Spine / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*