title: [Percutaneous kyphoplasty in hyperextension position for treatment of osteoporotic vertebral compression fracture with vacuum phenomenon].
abstract: OBJECTIVE
  To evaluate the efficacy of percutaneous kyphoplasty (PKP) in hyperextension position for the treatment of osteoporotic vertebral compression fracture (OVCF) with vacuum phenomenon.
  
  
  METHODS
  Between April 2004 and August 2009, 35 patients who suffered from OVCF with vacuum phenomenon were treated with PKP in hyperextension position, 8 patients were excluded because of lost follow-up. In 27 follow-up cases, there were 9 males and 18 females with an average age of 75 years (range, 58-90 years) and with an average disease duration of 9.8 months (range, 2-17 months). One vertebral body was involved in 26 cases and 2 vertebral bodies were involved in 1 case. According to the imaging examination and Krauss et al. criterion, all patients were diagnosed as having vertebral vacuum phenomenon. Refer to the lateral X-ray views, the height and the kyphotic angle of the involved vertebral body were measured pre- and postoperatively. The surgical outcomes were evaluated by using visual analogue scale (VAS) and Oswestry disability index (ODI) system.
  
  
  RESULTS
  All operations were performed successfully with no severe complication. The mean follow-up of 27 patients was 32 months (range, 24-58 months). The mean clinical healing time of OVCF was 4 months (range, 3-6 months). The VAS score, ODI system, anterior and medial height of involved vertebral body, kyphotic angle of involved vertebral body were improved significantly at 1 week after operation and at last follow-up (P < 0.05); there was no significant difference between at 1 week after operation and at last follow-up (P > 0.05). There was no significant difference in the posterior height of involved vertebral body among different postoperative time-points (P > 0.05). Asymptomatic cement leakage occurred in 3 patients. Adjacent vertebral fracture occurred in 1 patient at 7 months. Intravertebral vacuums showed a compact and solid cement filling pattern.
  
  
  CONCLUSIONS
  PKP in hyperextension position can significantly relieve back pain, restore vertebral height, and correct local kyphosis in the treatment of OVCF with vacuum phenomenon.
authors.affiliation: Department of Orthopedic Surgery, the First Affiliated Hospital of Soochow University, Suzhou Jiangsu, 215006, P.R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Liang
authors.initials: L
authors.lastname: Chen
authors.forename: Yong
authors.initials: Y
authors.lastname: Gu
authors.forename: Yun
authors.initials: Y
authors.lastname: Xu
authors.forename: Huilin
authors.initials: H
authors.lastname: Yang
authors.forename: Tiansi
authors.initials: T
authors.lastname: Tang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D050815:Fractures, Compression / Q000209:etiology / Q000601:surgery*; D006801:Humans; D058498:Kyphoplasty / Q000379:methods*; D008297:Male; D008875:Middle Aged; D058866:Osteoporotic Fractures / Q000601:surgery*; D013122:Spinal Diseases / Q000209:etiology / Q000601:surgery*