title: Intraoperative push-prone test: a useful technique to determine the lowest instrumented vertebra in adolescent idiopathic scoliosis.
abstract: METHODS
  A retrospective review of 24 cases of adolescent idiopathic scoliosis (AIS). Intraoperative push-prone test to determine the lowest instrumented vertebrae (LIV).
  
  
  OBJECTIVE
  To determine the LIV using intraoperative push-prone test.
  
  
  BACKGROUND
  Determination of the LIV in surgical treatment of the AIS remains controversial. Different classifications schemes have been proposed to help surgeons in making this decision. Most schemes depend on flexibility views. However, variability in technique of obtaining flexibility views and interpretation of these views in relation to the classification schemes make decision making in choosing the LIV difficult.
  
  
  METHODS
  An intraoperative push-prone image was used to determine LIV.
  
  
  RESULTS
  We were able to stop 1 or 2 levels above the stable vertebra in most cases. All patients had a well-balanced thorax over the pelvis.
  
  
  CONCLUSIONS
  Intraoperative push-prone test is a useful adjunct to predict the LIV in AIS.
authors.affiliation: Department of Orthopaedic Surgery, University of Iowa, Iowa City, IA.
authors.forename: Bachar F
authors.initials: BF
authors.lastname: Harfouch
authors.forename: Stuart L
authors.initials: SL
authors.lastname: Weinstein
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D007430:Intraoperative Care / Q000379:methods*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D008297:Male; D011300:Preoperative Care; D012600:Scoliosis / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D055815:Young Adult