title: Bilateral interlaminar fenestration and unroofing for the decompression of nerve roots by using a unilateral approach in lumbar canal stenosis.
abstract: BACKGROUND
  Conventional laminectomy is a simple procedure that provides adequate decompression in cases of lumbar spinal canal stenosis. However, with this surgical modality, important posterior osteoligamentous elements necessary for spinal stability are lost; and it is often accompanied by damage to the facet joint. Bilateral interlaminar fenestration and unroofing of the intervertebral foramen to achieve decompression of the nerve roots by using a unilateral microsurgical approach in lumbar spinal canal stenosis are less invasive compared with conventional laminectomy.
  
  
  METHODS
  We carried out bilateral interlaminar fenestration and unroofing of the intervertebral foramen to decompress the stenosed nerve roots under a microscope by using a unilateral approach. In particular, we performed the decompression of the contralateral nerve root with this surgical method by using a Caspar retractor. Surgery was performed on 47 patients (18 women and 29 men; 29-85 years; median age, 62 years). All cases were with single-level lumbar spinal canal stenosis and bilateral radiculopathy.
  
  
  RESULTS
  The mean preoperative NCOS was 29.8 (range, 8-48). The mean NCOS after a postoperative period of 3 months was 79.9 (range, 32-100). After a postoperative period of 2 years, the mean NCOS increased to 83.2 (range, 32-100). The satisfaction measures indicated that the procedure was "very successful" in 45 cases, providing "almost complete relief"; "fairly successful" in one case, providing "a good deal of relief"; and "not very successful" in another case, affording "only a little relief."
  
  
  CONCLUSIONS
  This unilateral, minimally invasive decompression provided satisfactory results.
authors.affiliation: Department of Neurosurgery, Osaka University Medical School, Suita, Osaka 565-0871, Japan. kiwatsuki@nsurg.med.osaka-u.ac.jp
authors.forename: Koichi
authors.initials: K
authors.lastname: Iwatsuki
authors.forename: Toshiki
authors.initials: T
authors.lastname: Yoshimine
authors.forename: Masanori
authors.initials: M
authors.lastname: Aoki
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007796:Laminectomy / Q000379:methods*; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000209:etiology / Q000601:surgery*; D012189:Retrospective Studies; D013126:Spinal Nerve Roots; D013130:Spinal Stenosis / Q000150:complications / Q000601:surgery*; D013168:Spondylolisthesis / Q000150:complications / Q000601:surgery; D016896:Treatment Outcome