• Kenneth Thomas, Peter Faris, Greg McIntosh, Simon Manners, Edward Abraham, Christopher S Bailey, Jerome Paquet, David Cadotte, W Bradley Jacobs, Y Raja Rampersaud, Neil A Manson, Hamilton Hall, and Charles G Fisher.
• University of Calgary, Foothills Medical Centre, 1403  29th ST NW, Calgary, Alberta, Canada T2N 2T9.
• Spine J. 2019 Oct 1; 19 (10): 1633-1639.

BackgroundDegenerative lumbar spinal stenosis is a common condition, predominantly affecting middle-aged and elderly people. This study focused on patients with neurogenic claudication secondary to lumbar stenosis without spondylolisthesis or deformity.PurposeTo determine whether the addition of fusion to decompression resulted in improved clinical outcomes at 3, 12, and 24 months postsurgery.Study Design/SettingThe Canadian Spine Outcomes and Research Network (CSORN) prospective database that includes pre- and postoperative data from tertiary care hospitals.Patient SampleThe CSORN database was queried for consecutive spine surgery cases of degenerative lumbar stenosis receiving surgical decompression for neurogenic claudication or radiculopathy. Neurogenic claudication patients with baseline and 2-year follow-up data, from four sites, formed the study sample (n=306). The sample was categorized into two groups: (1) those that had decompression alone, and (2) those that underwent decompression plus fusion.Outcome MeasuresChange in modified Oswestry Disability Index (ODI), numerical rating scale for back/leg pain, the EuroQol EQ5D, the SF-12 physical, and mental component scores. The primary outcome measure was the ODI at 2 years postoperative.MethodsWe conducted a multicenter, ambispective review of consecutive spine surgery patients enrolled between October 2012 and January 2018.ResultsBaseline characteristics were comparable between groups except for female sex and multilevel pathology (both with greater proportion in the decompression plus fusion group). The decompression plus fusion group had clinically meaningfully more operative time, blood loss, rate of perioperative complication, and length of hospital stay (p<.05). These differences were preserved following adjustment for baseline differences between the groups. Both decompression and decompression plus fusion had a large clinically meaningful impact on generic and disease-specific patient-reported outcome measures within 3 months of surgery which was maintained out to 24-month follow-up. At any follow-up time point, there was no statistical evidence of a difference in these effects favoring decompression plus fusion over decompression alone.ConclusionsThe addition of fusion to decompression did not result in improved outcomes at 3-, 12-, or 24-month follow-up. The addition of fusion to decompression provides no advantage to decompression alone for the treatment of patients with neurogenic claudication secondary to lumbar stenosis without spondylolisthesis or deformity.Copyright © 2019 Elsevier Inc. All rights reserved.

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