title: Kyphoplasty versus vertebroplasty: restoration of vertebral body height and correction of kyphotic deformity with special attention to the shape of the fractured vertebrae.
abstract: METHODS
  Retrospective comparative analysis.
  
  
  OBJECTIVE
  We analyzed kyphosis correction, vertebral height restoration, and bone cement leakage in patients treated by vertebroplasty (VP) and kyphoplasty (KP) to compare the effectiveness of VP and KP for the treatment of osteoporotic vertebral compression fractures.
  
  
  BACKGROUND
  Superior results have been reported for the use of KP for kyphotic deformity correction and collapsed vertebral height restoration. However, there are no previous comparative reports comparing the efficacy of KP versus VP according to the shapes of fractured vertebrae.
  
  
  METHODS
  A total of 103 patients underwent either VP (n=58) or KP (n=45) for treatment of osteoporotic vertebral compression fracture between October 2006 and September 2009. We organized the patients into 6 groups according to treatment method and fracture type: VP (wedge-shaped), VP (V-shaped), VP (flat-shaped), KP (wedge-shaped), KP (V-shaped), and KP (flat-shaped). Comparisons were performed for kyphosis correction, vertebral height restoration, and cement leakage between VP and KP groups.
  
  
  RESULTS
  KP was more effective than VP, especially for middle column height restoration and bone cement leakage prevention, for all fracture types (P value <0.05). In addition, KP was more effective in anterior height restoration and kyphosis correction in both flat and wedge-shape fractures (P value <0.05). However, posterior column vertebral height was not restored in either the KP group or the VP group. The clinical outcomes did not differ between the 2 groups (P value >0.05).
  
  
  CONCLUSIONS
  KP has a significant advantage over VP in terms of kyphosis correction, vertebral height restoration, and cement leakage prevention. KP has an obvious advantage in terms of middle vertebral height restoration and cement leakage prevention, especially for V-shape compression fractures.
authors.affiliation: Department of Neurosurgery, Gangnam Severance Spine Hospital, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Kyung-Hyun
authors.initials: KH
authors.lastname: Kim
authors.forename: Sung-Uk
authors.initials: SU
authors.lastname: Kuh
authors.forename: Dong-Kyu
authors.initials: DK
authors.lastname: Chin
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Jin
authors.forename: Keun-Su
authors.initials: KS
authors.lastname: Kim
authors.forename: Young-Sul
authors.initials: YS
authors.lastname: Yoon
authors.forename: Yong-Eun
authors.initials: YE
authors.lastname: Cho
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements; D005260:Female; D050815:Fractures, Compression / Q000601:surgery*; D006801:Humans; D058498:Kyphoplasty / Q000379:methods*; D007738:Kyphosis / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000293:injuries / Q000601:surgery; D008297:Male; D008875:Middle Aged; D058866:Osteoporotic Fractures / Q000601:surgery*; D010147:Pain Measurement; D016103:Spinal Fractures / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000293:injuries / Q000601:surgery; D054854:Vertebroplasty / Q000379:methods*
chemical_list: D001843:Bone Cements