title: Kyphoplasty and vertebroplasty produce the same degree of height restoration.
abstract: OBJECTIVE
  There are few comparative studies regarding morphologic changes after kyphoplasty and vertebroplasty. The purpose of this study was to compare restoration of vertebral body height and wedge angle and cement leakage with kyphoplasty and vertebroplasty in osteoporotic compression fractures.
  
  
  METHODS
  Forty patients (57 vertebrae) were treated with kyphoplasty, and 66 patients (124 vertebrae) were treated with vertebroplasty. Cement leakage into the disk space and paravertebral soft tissues or veins was analyzed on immediate postoperative CT scans. The height and wedge angle were measured before and after treatment and analyzed with the Mann-Whitney U test and chi(2) test.
  
  
  RESULTS
  Kyphoplasty and vertebroplasty both improved vertebral body height and the wedge angles (P < .05). However, these differences were not statistically significant when the 2 techniques were compared (P > .05). There were 18% of the kyphoplasty group and 49% of the vertebroplasty group that showed cement leakage into the paravertebral soft tissues or veins (P < .01). Cement leakage into the disk space occurred in 12% of the kyphoplasty group and in 25% of the vertebroplasty group (P < .01). However, no complications related to cement leakage were noted.
  
  
  CONCLUSIONS
  Both kyphoplasty and vertebroplasty achieved the same degree of height restoration and improvement of the wedge angle. Kyphoplasty resulted in less cement leakage into the disk space and paravertebral soft tissues or veins than vertebroplasty.
authors.affiliation: Division of Diagnostic and Interventional Neuroradiology, Department of Imaging Sciences, University of Rochester Medical Center, Rochester, NY, USA. hiwatasi@radiol.med.kyushu-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Hiwatashi
authors.forename: P-L A
authors.initials: PL
authors.lastname: Westesson
authors.forename: T
authors.initials: T
authors.lastname: Yoshiura
authors.forename: T
authors.initials: T
authors.lastname: Noguchi
authors.forename: O
authors.initials: O
authors.lastname: Togao
authors.forename: K
authors.initials: K
authors.lastname: Yamashita
authors.forename: H
authors.initials: H
authors.lastname: Kamano
authors.forename: H
authors.initials: H
authors.lastname: Honda
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001827:Body Height; D001843:Bone Cements; D005260:Female; D050815:Fractures, Compression / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D006801:Humans; D015994:Incidence; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000150:complications* / Q000473:pathology; D011183:Postoperative Complications / Q000453:epidemiology; D012189:Retrospective Studies; D016103:Spinal Fractures / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D054854:Vertebroplasty / Q000009:adverse effects / Q000379:methods*
chemical_list: D001843:Bone Cements