title: Comparison of the Dynesys Dynamic Stabilization System and Posterior Lumbar Interbody Fusion for Lumbar Degenerative Disease.
abstract: BACKGROUND
  There have been few studies comparing the clinical and radiographic outcomes between the Dynesys dynamic stabilization system and posterior lumbar interbody fusion (PLIF). The objective of this study is to compare the clinical and radiographic outcomes of Dynesys and PLIF for lumbar degenerative disease.
  
  
  METHODS
  Of 96 patients with lumbar degenerative disease included in this retrospectively analysis, 46 were treated with the Dynesys system and 50 underwent PLIF from July 2008 to March 2011. Clinical and radiographic outcomes were evaluated. We also evaluated the occurrence of radiographic and symptomatic adjacent segment degeneration (ASD).
  
  
  RESULTS
  The mean follow-up time in the Dynesys group was 53.6 ± 5.3 months, while that in the PLIF group was 55.2 ± 6.8 months. At the final follow-up, the Oswestry disability index and visual analogue scale score were significantly improved in both groups. The range of motion (ROM) of stabilized segments in Dynesys group decreased from 7.1 ± 2.2° to 4.9 ± 2.2° (P < 0.05), while that of in PLIF group decreased from 7.3 ± 2.3° to 0° (P < 0.05). The ROM of the upper segments increased significantly in both groups at the final follow-up, the ROM was higher in the PLIF group. There were significantly more radiographic ASDs in the PLIF group than in the Dynesys group. The incidence of complications was comparable between groups.
  
  
  CONCLUSIONS
  Both Dynesys and PLIF can improve the clinical outcomes for lumbar degenerative disease. Compared to PLIF, Dynesys stabilization partially preserves the ROM of the stabilized segments, limits hypermobility in the upper adjacent segment, and may prevent the occurrence of ASD.
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Jian-Lin
authors.initials: JL
authors.lastname: Shan
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Xiu-Mei
authors.initials: XM
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Guan
authors.affiliation: Department of Orthopedics, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Tian-Sheng
authors.initials: TS
authors.lastname: Sun
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000473:pathology / Q000534:rehabilitation / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000473:pathology / Q000601:surgery*; D008161:Lumbosacral Region / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D010149:Postoperative Pain / Q000503:physiopathology / Q000517:prevention & control; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000379:methods*; D013130:Spinal Stenosis / Q000473:pathology / Q000534:rehabilitation / Q000601:surgery*; D016896:Treatment Outcome
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