title: Non-fusion procedure using PEEK rod systems for lumbar degenerative diseases: clinical experience with a 2-year follow-up.
abstract: BACKGROUND
  Polyetheretherketone (PEEK) rod system is a novel pedicle-based dynamic stabilization system. This study evaluated clinical and radiographic outcomes of non-fusion surgery by PEEK rod systems for treatment of degenerative lumbar diseases with a 2-year follow-up.
  
  
  METHODS
  From February 2012 to October 2012, 38 patients who underwent non-fusion surgery using PEEK rod systems were included in the study. Data on Oswestry Disability Index (ODI) score and Japanese Orthopaedics Association (JOA) score were collected and radiographs were obtained to evaluate disc height index (DHI) and range of motion (ROM) at each interval.
  
  
  RESULTS
  Both JOA and ODI scores significantly improved postoperatively. DHI showed a slight increase immediately after the surgery but gradually dropped below preoperative levels. Mean ROM values changed from 8.8° preoperatively to 1.8° at the 2-year follow-up point. Screw loosening occurred in one case at the 2-year follow-up.
  
  
  CONCLUSIONS
  The preliminary results indicated a significant improvement in clinical outcomes and advantageous implant safety. The non-fusion procedure using PEEK rod systems might be a viable alternative for treatment of lumbar degenerative diseases. The distraction technique needs to be improved for better postoperative DHI.
authors.affiliation: Department of Orthopedics, General Hospital of Jinan Military Commanding Region, NO. 25 Shifan Road, Jinan, Shandong, 250031, People's Republic of China.
authors.forename: Weimin
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of Orthopedics, General Hospital of Jinan Military Commanding Region, NO. 25 Shifan Road, Jinan, Shandong, 250031, People's Republic of China.
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Chang
authors.affiliation: Department of Orthopedics, General Hospital of Jinan Military Commanding Region, NO. 25 Shifan Road, Jinan, Shandong, 250031, People's Republic of China.
authors.forename: Ruoxian
authors.initials: R
authors.lastname: Song
authors.affiliation: Department of Orthopedics, General Hospital of Jinan Military Commanding Region, NO. 25 Shifan Road, Jinan, Shandong, 250031, People's Republic of China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhou
authors.affiliation: Department of Orthopedics, General Hospital of Jinan Military Commanding Region, NO. 25 Shifan Road, Jinan, Shandong, 250031, People's Republic of China. xiuchunyu1965@outlook.com.
authors.forename: Xiuchun
authors.initials: X
authors.lastname: Yu
mesh_terms: D000328:Adult; D000368:Aged; D001577:Benzophenones; D001696:Biomechanical Phenomena; D001863:Bone Screws; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D007659:Ketones; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000009:adverse effects / Q000295:instrumentation*; D011092:Polyethylene Glycols; D011108:Polymers; D011446:Prospective Studies; D011474:Prosthesis Design; D019919:Prosthesis Implantation / Q000009:adverse effects / Q000295:instrumentation*; D016059:Range of Motion, Articular; D020127:Recovery of Function; D013122:Spinal Diseases / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D001577:Benzophenones; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols
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