title: Semirigid Waved Rod System for the Treatment of the Degenerative Lumbar Diseases.
abstract: BACKGROUND
  The semirigid pedicle screw instrumentation has gained wide popularity in recent decennium in lumbar fusion surgery. However, few data were documented to compare the clinical efficacy between semirigid and traditional rigid pedicle screw systems.
  
  
  METHODS
  A total of 96 patients with degenerative lumbar diseases were selected to perform operations between 2008 and 2013. The patients were prospectively randomized into 2 groups: 50 patients were managed by semirigid waved rod systems and 46 patients were intervened by traditional rigid straight stiff rod systems. X-rays and computed tomography were utilized to examine the interbody fusion status in the follow-up in detail. Surgical parameters such as operative time, blood loss, and total hospital stay were calculated and compared. Visual Analog Scale and Oswestry Disability Index were used to assess clinical efficacy postoperatively.
  
  
  RESULTS
  No significant differences were found about demographic data between groups. There were no significant differences regarding the surgical parameters including operative time, blood loss, and total hospital stay. Visual Analog Scale and Oswestry Disability Index postoperatively were also similar between the 2 instrumentations (P>0.05). The fusion rate was higher in the semirigid group (45/50) than in the traditional group (34/46) (P=0.039) at the final follow-up.
  
  
  CONCLUSIONS
  Waved rod may be better in facilitating interbody fusion compared with traditional straight rod, although waved rod and straight stiff rod can both get similar clinical efficacy. Meanwhile, waved rod is likely superior in alleviating adjacent degeneration segments.
authors.affiliation: Department of Orthopaedic Surgery, the Affiliated Southeast Hospital of Xiamen University, Orthopaedic Center of People's Liberation Army, Zhangzhou, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Dasheng
authors.initials: D
authors.lastname: Lin
authors.forename: Weitao
authors.initials: W
authors.lastname: Zou
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Kejian
authors.initials: K
authors.lastname: Lian
mesh_terms: D000328:Adult; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055959:Intervertebral Disc Degeneration / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D065289:Pedicle Screws; D013123:Spinal Fusion; D064232:Visual Analog Scale