title: Better Height Restoration, Greater Kyphosis Correction, and Fewer Refractures of Cemented Vertebrae by Using an Intravertebral Reduction Device: a 1-Year Follow-up Study.
abstract: OBJECTIVE
  This study compared the radiologic and clinical outcomes of kyphoplasty with intravertebral reduction device (IRD) and vertebroplasty (VP) in treating osteoporotic vertebral compression fractures (OVCFs).
  
  
  METHODS
  We enrolled 75 patients with OVCFs who were aged >60 years and treated them through VP or kyphoplasty with IRD. The radiologic outcomes, namely the anterior and middle body heights (ABH and MBH, respectively) and kyphotic angle (KA), were measured preoperatively and at postoperative 1 week, 3 months, 6 months, and 1 year. The refracture was identified on the basis of a decrease in ABH, MBH, or KA compared with those at postoperative 1 week. Visual analog scale (VAS) for pain and complications were recorded. The incidence of adjacent and nonadjacent fractures was also recorded.
  
  
  RESULTS
  We treated 36 patients with kyphoplasty with IRD (IRD group) and 39 through VP (VP group). The patient characteristics were comparable in both groups. The KA and its restoration were more favorable after IRD than after VP. Although ABHs were not different in either group, their restoration was more efficient after IRD than after VP. MBHs, their restoration, and their refracture rates were better after IRD than after VP. VAS pain scores and complication rates were not different between the groups. The incidences of adjacent or nonadjacent fractures were not different between the 2 groups.
  
  
  CONCLUSIONS
  Our findings reveal significantly more efficient height restoration and kyphosis correction and fewer refractures in the IRD group. IRD may not increase the risk of adjacent or nonadjacent fractures.
authors.affiliation: Department of Neurosurgery, Taipei Medical University, Taipei, Taiwan; Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University and National Health Research Institutes, Taipei, Taiwan; Division of Neurosurgery, Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Jiann-Her
authors.initials: JH
authors.lastname: Lin
authors.affiliation: Department of Neurosurgery, Taipei Medical University, Taipei, Taiwan.
authors.forename: Sheng-Hao
authors.initials: SH
authors.lastname: Wang
authors.affiliation: Department of Neurosurgery, Taipei Medical University, Taipei, Taiwan.
authors.forename: En-Yuan
authors.initials: EY
authors.lastname: Lin
authors.affiliation: Department of Neurosurgery, Taipei Medical University, Taipei, Taiwan; Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University and National Health Research Institutes, Taipei, Taiwan; Division of Neurosurgery, Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. Electronic address: jiannherlin@gmail.com.
authors.forename: Yung-Hsiao
authors.initials: YH
authors.lastname: Chiang
mesh_terms: D000368:Aged; D001416:Back Pain / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D050815:Fractures, Compression / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D016268:Internal Fixators; D058498:Kyphoplasty / Q000295:instrumentation*; D007738:Kyphosis / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D019060:Minimally Invasive Surgical Procedures; D058866:Osteoporotic Fractures / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D010147:Pain Measurement; D010149:Postoperative Pain; D012189:Retrospective Studies; D016103:Spinal Fractures / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery; D016896:Treatment Outcome; D054854:Vertebroplasty
chemical_list: D001843:Bone Cements
keywords: Compression fracture; Intervertebral reduction; Osteoporosis