title: Increase in vertebral body height after vertebroplasty.
abstract: OBJECTIVE
  During clinical work, we have seen increases in vertebral body height associated with vertebroplasty, but our literature search revealed no reports as to how often and to what degree those increases occur. The purpose of this study was to document the frequency and degree of changes in vertebral body height after vertebroplasty.
  
  
  METHODS
  The heights of 85 vertebral bodies in 37 patients were measured before and after vertebroplasty. In addition, one adjacent vertebral body was measured in each patient as a control. Twenty-six patients had compression fractures in the thoracic spine, and 24 patients had compression fractures in the lumbar spine. Vertebroplasty was performed with a bilateral transpedicular approach by injecting polymethylmethacrylate, under biplane fluoroscopic control. Measurements were performed on preoperative MR images and on postoperative CT sagittal reformations. Anterior, central, and posterior vertebral body height measurements were obtained in the midsagittal plane.
  
  
  RESULTS
  The average increase in vertebral body height was 2.5 mm anteriorly, 2.7 mm centrally, and 1.4 mm posteriorly. Thirteen of 85 treated vertebrae remained unchanged. All control vertebral bodies also remained unchanged.
  
  
  CONCLUSIONS
  Vertebral body height often increases during vertebroplasty. The clinical significance of increasing vertebral body height is unknown.
authors.affiliation: Department of Diagnostic Radiology, University of Rochester Medical Center, 601 Elmwood Avenue, Box 648, Rochester, NY 14642-8648, USA.
authors.forename: Akio
authors.initials: A
authors.lastname: Hiwatashi
authors.forename: Toshio
authors.initials: T
authors.lastname: Moritani
authors.forename: Yuji
authors.initials: Y
authors.lastname: Numaguchi
authors.forename: Per-Lennart
authors.initials: PL
authors.lastname: Westesson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005471:Fluoroscopy; D005500:Follow-Up Studies; D005598:Fractures, Spontaneous / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D006801:Humans; D008159:Lumbar Vertebrae / Q000473:pathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019904:Polymethyl Methacrylate / Q000008:administration & dosage*; D011183:Postoperative Complications / Q000175:diagnosis*; D016103:Spinal Fractures / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000473:pathology / Q000601:surgery*
chemical_list: D019904:Polymethyl Methacrylate