title: Results of degenerative spondylolisthesis treated with posterior decompression alone via a new surgical approach.
abstract: OBJECTIVE
  The purpose of this study was to assess radiologically demonstrated results and clinical outcomes in patients with degenerative spondylolisthesis who underwent posterior decompressive surgery via a new (unilateral) approach. This approach allows surgeons to perform central and bilateral decompression while only stripping the muscles unilaterally, thus preserving the posterior osteoligamentous complexes.
  
  
  METHODS
  The authors evaluated 51 consecutive patients in whom surgery was performed between 1987 and 1996. The mean follow-up period was 4.7 years. There was no statistically significant difference between the pre- and postoperative measurements in percentage of vertebral slippage. Postoperative dynamic angulation statistically decreased compared with its preoperative value (p < 0.05). Improvement of an average of 67% was shown on the Japanese Orthopaedic Association scale, and in 78% of these patients, good to excellent results were demonstrated. Secondary fusion was required in only three patients (5.9%).
  
  
  CONCLUSIONS
  This new surgical technique offers a potential alternative for the treatment of degenerative spondylolisthesis in a minimally invasive manner, avoiding the risk of causing or aggravating postoperative spinal instability.
authors.affiliation: Division of Orthopedic Surgery, Yuki Hospital, Ibaraki, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kinoshita
authors.forename: I
authors.initials: I
authors.lastname: Ohki
authors.forename: K R
authors.initials: KR
authors.lastname: Roth
authors.forename: K
authors.initials: K
authors.lastname: Amano
authors.forename: H
authors.initials: H
authors.lastname: Moriya
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 / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications / Q000175:diagnosis; D013126:Spinal Nerve Roots / Q000473:pathology / Q000601:surgery*; D013168:Spondylolisthesis / Q000175:diagnosis / Q000601:surgery*