title: Clinical Efficacy of Percutaneous Kyphoplasty at the Hyperextension Position for the Treatment of Osteoporotic Kümmell Disease.
abstract: BACKGROUND
  Percutaneous kyphoplasty might be effective for osteoporotic Kümmell disease.
  
  
  OBJECTIVE
  To investigate the clinical efficacy of percutaneous kyphoplasty in hyperextension for osteoporotic Kümmell disease.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  A retrospective analysis was carried out on data from downstream balloon kyphoplasty treatments in hyperextension for 18 patients with osteoporotic Kümmell disease. All cases were single-segment disease affecting T5 (1 case), T7 (1 case), T8 (2 cases), T11 (6 cases), T12 (4 cases), L1 (2 cases), L2 (1 case), or L4 (1 case). Dual-energy x-ray absorptiometry bone mineral density values ranged from -2.8 to -5.8 SD. The sagittal Cobb angle of the involved segment was measured before and after the operation and the final follow-up also included a visual analog pain score (VAS) and the Oswestry Disability Index (ODI) after comprehensive efficacy assessment.
  
  
  RESULTS
  All patients were followed up for 12-36 months, with an average of 15.8 months. Patients showed lower back pain relief and improvement in daily life activities. The kyphosis Cobb angle improved from 32.60±3.82 degrees before surgery to 7.60±1.68 degrees after surgery, and VAS and ODI scores significantly improved from 8.7±0.96 points and 88.6±3.76% to 2.6±0.32 points and 28.6±2.67%, respectively. The last follow-up for the kyphosis Cobb angle yielded a value of 9.60±2.06 degrees, and VAS and ODI averaged 2.2±0.26 points and 26.4±2.46%, respectively. Compared with 2 days postoperatively, the differences were not statistically significant. Intervertebral cement leakage occurred in 1 case, but no symptom was observed and no treatment was performed.
  
  
  CONCLUSIONS
  Percutaneous balloon kyphoplasty in the hyperextension position is an effective method for osteoporosis in Kümmell disease.
authors.affiliation: Department of Orthopaedics, the Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China.
authors.forename: Yijiang
authors.initials: Y
authors.lastname: Huang
authors.forename: Maoxiu
authors.initials: M
authors.lastname: Peng
authors.forename: Shaoqi
authors.initials: S
authors.lastname: He
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Tang
authors.forename: Minghai
authors.initials: M
authors.lastname: Dai
authors.forename: Chengxuan
authors.initials: C
authors.lastname: Tang
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D050815:Fractures, Compression / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D058498:Kyphoplasty / Q000379:methods*; D008297:Male; D008875:Middle Aged; D058866:Osteoporotic Fractures / Q000000981:diagnostic imaging / Q000601:surgery*; D056888:Patient Positioning; D012189:Retrospective Studies; D016103:Spinal Fractures / Q000000981:diagnostic imaging / Q000601:surgery*; D016896:Treatment Outcome