title: Decompression and interspinous dynamic stabilization using the locker for lumbar canal stenosis associated with low-grade degenerative spondylolisthesis.
abstract: BACKGROUND
  Decompression and spinal fusion have been generally recommended for spinal stenosis associated with low-grade degenerative spondylolisthesis (DS), although this is still controversial. The purpose of the present study is to analyze the clinical and radiological outcomes of interspinous dynamic stabilization using the Locker (WINNOVA co, Seoul, Korea) for lumbar canal stenosis with grade I DS.
  
  
  METHODS
  The authors performed a retrospective review of 23 consecutive patients who underwent single level decompression and the Locker application for lumbar canal stenosis with grade I DS and were followed up for at least 2 years. Excluded were those with DS grade II or higher and DS combined with foraminal disc herniation/stenosis. The mean age of patients at the time of surgery was 62.1 years (range: 45-81 years).
  
  
  RESULTS
  There were no complications in the perioperative period. At a mean follow-up duration of 28.3 months (range: 24-32 months), visual analogue scale scores for back pain, leg pain, and Oswestry disability index had decreased significantly; from 4.6, 7.2, and 38.5% to 2.4, 2.6, and 15.3%, respectively. Clinical success was achieved in 87% of the patients. The mean percentage of slippage did not change significantly. The mean sagittal rotation angle significantly decreased from 9.7 to 6.5 degrees (p=0.01). One patient (4.3%) underwent secondary fusion surgery due to persistent pain.
  
  
  CONCLUSIONS
  Decompression and interspinous dynamic stabilization using the Locker yielded favorable clinical and radiological outcomes for lumbar canal stenosis with grade I DS and could be an alternative for spinal fusion. However, further long-term follow-up studies are necessary.
authors.affiliation: Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea.
authors.forename: D Y
authors.initials: DY
authors.lastname: Lee
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
authors.forename: C S
authors.initials: CS
authors.lastname: Shim
authors.forename: H Y
authors.initials: HY
authors.lastname: Lee
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019299:Decompression, Surgical / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006801:Humans; D016268:Internal Fixators / Q000592:standards / Q000639:trends*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000295:instrumentation* / Q000379:methods; D011859:Radiography; D012189:Retrospective Studies; D013130:Spinal Stenosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D013168:Spondylolisthesis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*