title: [Analyses of segment motor function in patients with degenerative lumbar disease on the treatment of WavefleX dynamic stabilization system].
abstract: OBJECTIVE
  To explore the changes of range-of-motion (ROM) in patients with degenerative lumbar disease on the treatment of WavefleX dynamic stabilization system and examine the postoperative lumbar regularity and tendency of ROM.
  
  
  METHODS
  Nine patients with degenerative lumbar disease on the treatment of WavefleX dynamic stabilization system were followed up with respect to ROMs at 5 timepoints within 12 months. Records of ROM were made for instrumented segments, adjacent segments and total lumbar.
  
  
  RESULTS
  Compared with preoperation, ROMs in non-fusional segments with WavefleX dynamic stabilization system decreased statistical significantly (P < 0.05 or P < 0.01) at different timepoints; ROMs in adjacent segments increased at some levels without wide statistical significance. The exception was single L3/4 at Month 12 (P < 0.05) versus control group simultaneously at the levels of L3/4, L4/5 and L5/S1, ROMs decreased at Months 6 and 12 with wide statistical significance (P < 0.05 or P < 0.01). ROMs in total lumbar had statistical significant decrease (P < 0.01) in both group of non-fusional segments and hybrid group of non-fusion and fusion. The trends of continuous augments were observed during follow-ups. Statistically significant augments were also acquired at 4 timepoints as compared to control group (P < 0.01).
  
  
  CONCLUSIONS
  The treatment of degenerative lumbar diseases with WavefleX dynamic stabilization system may limit excessive extension/inflexion and preserve some motor functions. Moreover, it can sustain physiological lordosis, decrease and transfer disc load in adjacent segments to prevent early degeneration of adjacent segment. Trends of motor function augment in total lumbar need to be confirmed during future long-term follow-ups.
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Junsong
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Junhua
authors.initials: J
authors.lastname: Du
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Xiangyun
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Xigong
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Jingyu
authors.initials: J
authors.lastname: Du
authors.affiliation: Department of Orthopedics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China. Email: wjs128@sina.com.
authors.forename: Xiangjin
authors.initials: X
authors.lastname: Lin
mesh_terms: D006801:Humans; D008159:Lumbar Vertebrae; D016059:Range of Motion, Articular; D013122:Spinal Diseases / Q000503:physiopathology* / Q000601:surgery; D013123:Spinal Fusion