title: Modified unilateral laminotomy for bilateral decompression for lumbar spinal stenosis: technical note.
abstract: METHODS
  A prospective clinical study of M-ULBD of lumbar spinal stenosis (LSS).
  
  
  OBJECTIVE
  In this article, the authors describe the technique of M-ULBD for lumbar spinal stenosis, and reported 2-year follow-up results.
  
  
  BACKGROUND
  Recent reports showed that atrophy of multifidus muscles and chronic low back pain after conventional laminectomy may relate to disturbance of the arterial supply caused by long duration of muscle retraction, extensive muscle stripping, and damage to the dorsal rami of the posterior branches.
  
  
  METHODS
  A total of 56 patients with LSS were randomly divided into group A and B. The 27 patients in group A (15 males and 12 females) underwent M-ULBD. The other 29 patients in group B (18 males and 11 females) received conventional laminectomy. Japanese Orthopaedic Association score of low back pain, 10-cm visual analogue scale, creatine phosphokinase 3 days after operation, pre- and postoperative cross-sectional areas of multifidus were used to evaluate the clinical results.
  
  
  RESULTS
  There was no significant difference in preoperative data between both groups. A total of 54 patients (27 in each group A and B) completed 2 years of follow-up. The postoperative Japanese Orthopaedic Association and visual analogue scale scores in both groups were improved significantly compared with the corresponding preoperative ones (P < 0.05). The postoperative creatine phosphokinase, visual analogue scale score of low back pain, and atrophy rate of multifidus CSA in group A are lower than those in group B (P < 0.05). Dural tear at the contralateral side occurred in 3 cases (11.1%) in group A and 1 case in group B (3.4%).
  
  
  CONCLUSIONS
  Our 2 years of follow-up shows that this method is efficient for lumbar spinal stenosis treatment; however, it still needs long-term follow-up and needs to be compared with other modified methods.
  
  
  METHODS
  3.
authors: From the Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China.
authors: Xinyu
authors: X
authors: Liu
authors: Suomao
authors: S
authors: Yuan
authors: Yonghao
authors: Y
authors: Tian
mesh_terms: D000368:Aged; D001284:Atrophy; D015415:Biomarkers / Q000097:blood; D002681:China; D003402:Creatine Kinase / Q000097:blood; D019299:Decompression, Surgical / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006801:Humans; D007796:Laminectomy / Q000009:adverse effects / Q000379:methods*; D017116:Low Back Pain / Q000175:diagnosis / Q000209:etiology; D008159:Lumbar Vertebrae / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D010149:Postoperative Pain / Q000175:diagnosis / Q000209:etiology; D064170:Paraspinal Muscles / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies; D013130:Spinal Stenosis / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers; D003402:Creatine Kinase