title: Surgical treatment of pyogenic spondylitis with the use of freeze-dried structural allograft.
abstract: OBJECTIVE
  Radical debridement and reconstruction is necessary for surgical treatment of pyogenic spondylitis to control infection and to provide segmental stability. The authors identified 25 patients who underwent surgery for pyogenic spondylitis using freeze-dried structural allograft for reconstruction. This study aimed to evaluate and demonstrate the effectiveness and safety of a freeze-dried structural allograft during the surgical treatment of pyogenic spondylitis.
  
  
  METHODS
  From January 2011 to May 2013, we retrospectively reviewed 25 surgically treated patients of pyogenic spondylitis. Surgical techniques used were anterior radical debridement and reconstruction with a freeze-dried structural allograft and instrumentation. In these 25 patients, we retrospectively examined whether the symptoms had improved and the infection was controlled after surgery by evaluating laboratory data, clinical and radiological outcomes. The average follow-up period was 15.7 months (range, 12.2-37.5 months).
  
  
  RESULTS
  The infection resolved in all of the patients and there were no cases of recurrent infection. The mean Visual Analog Scale score was 6.92 (range, 5-10) before surgery and 1.90 (range, 0-5) at the time of the last follow-up. Preoperatively, lower extremity motor deficits related to spinal infection were noted in 10 patients, and they improved in 7 patients after surgery. Follow-up computed tomographic scans were obtained from 10 patients, and osseous union between the vertebral body and the structural allograft was achieved in 2 patients.
  
  
  CONCLUSIONS
  The freeze-dried structural allograft can be a safe and effective alternative for surgical treatment of pyogenic spondylitis, and another option for vertebral reconstruction instead of using the other materials.
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Seung-Soo
authors.initials: SS
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kang
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Jong-Won
authors.initials: JW
authors.lastname: Yoon
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Hyun
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Chul-Hee
authors.initials: CH
authors.lastname: Lee
authors.affiliation: Department of Neurosurgery, GyeongSang National University School of Medicine, Jinju, Korea.
authors.forename: Soo-Hyun
authors.initials: SH
authors.lastname: Hwang
keywords: Allografts; Spondylitis