title: Postoperative change in sagittal balance after Kyphoplasty for the treatment of osteoporotic vertebral compression fracture.
abstract: OBJECTIVE
  The influence of vertebral cement augmentation on spinal sagittal balance is unknown. The present study aimed to analyze the changes in total spinal alignment after Kyphoplasty in VCF patients.
  
  
  METHODS
  The study involved 21 VCF patients who underwent Kyphoplasty. In all patients, lateral radiographs of the entire spine were taken preoperatively and 1 month after surgery, to measure the pelvic incidence (PI), sacral slope (SS), pelvic tilt (PT), lumbar lordosis (LL), sagittal vertical axis (SVA), and spinosacral angle (SSA). These parameters were compared between VCF patients and 30 healthy volunteers. In VCF patients, the parameters were compared before and after Kyphoplasty.
  
  
  RESULTS
  In VCF patients, preoperative SVA was 7.00 ± 3.9 cm, showing a significant shift to anterior sagittal balance as compared to the healthy group (1.45 ± 2.7 cm) (P < 0.0001). Preoperative SS was smaller and PT was larger in VCF group than in the healthy group (P < 0.05). After Kyphoplasty, SVA decreased to 5.02 ± 2.91 (P = 0.0007) and LL and SSA increased (LL P = 0.028; SSA P = 0.0031). Postoperative decrease of SVA was correlated with the kyphotic change of treated vertebra (r = 0.792, P < 0.01). VAS score decreased from 7.98 ± 1.8 before Kyphoplasty to 2.38 ± 2.3 postoperatively (P < 0.0001).
  
  
  CONCLUSIONS
  Total spinal alignment is shifted to anterior sagittal balance in VCF patients. Kyphoplasty plays a role not only in reducing pain associated with fractures but also in improving sagittal imbalance in the treatment of painful vertebral compression fracture.
authors.affiliation: Department of Neurosurgery, Takeda General Hospital, 28-1, Ishidamoriminami-machi, Fushimi, Kyoto, Kyoto, 601-1495, Japan, neu100@poh.osaka-med.ac.jp.
authors.forename: Kunio
authors.initials: K
authors.lastname: Yokoyama
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kawanishi
authors.forename: Makoto
authors.initials: M
authors.lastname: Yamada
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Tanaka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ito
authors.forename: Shinji
authors.initials: S
authors.lastname: Kawabata
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Kuroiwa
mesh_terms: D000328:Adult; D000368:Aged; D001416:Back Pain / Q000209:etiology / Q000601:surgery; D001843:Bone Cements / Q000627:therapeutic use; D005260:Female; D050815:Fractures, Compression / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D058498:Kyphoplasty / Q000379:methods*; D007738:Kyphosis / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D058866:Osteoporotic Fractures / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D010388:Pelvis / Q000000981:diagnostic imaging / Q000473:pathology; D011184:Postoperative Period; D011859:Radiography; D016103:Spinal Fractures / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D013131:Spine / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements