CClinicalTrials.gg
CompletedNCT01994512SSSSUpdated Dec 17, 2015

Swedish Spinal Stenosis Study

An interventional study of Decompression without fusion and Decompression with fusion in Lumbar Spinal Stenosis, sponsored by Uppsala University. Completed. Open to participants aged 50 Years to 80 Years. Per ClinicalTrials.gov, last updated 2015-12-17.

Sponsored by Uppsala University · Not applicable, Interventional, and Treatment

Phase
Not applicable
Study type
Interventional
Enrollment
245
Allocation
Randomized
Ages
50 Years to 80 Years
Sex
All
01

Study summary

A national randomized multicentre trial (RCT) where decompression is compared with decompression with simultaneous fusion in 245 patients with spinal stenosis on one or two adjacent lumbar levels with or without degenerative olisthesis. The material is stratified for the existence of degenerative olisthesis >3mm. Monitoring is performed with clinical results from patient surveys after 2 and five years, and with radiological follow-up (MRI, CT and plain X-ray) and an objective function test (6 min walking test) after 2 years. The null hypothesis is that there is no difference in results between the two interventions.

02

Conditions studied

  • Lumbar Spinal Stenosis

Keywords

  • Spinal stenosis
  • Decompression
  • Fusion
  • Olisthesis
03

In context

Spinal Stenosis

459 studies on the registry are indexed under Spinal Stenosis; 103 are open to participants now.

This study's enrollment of 245 is above the median of 80 across 283 interventional studies indexed under Spinal Stenosis.

Browse Spinal Stenosis studies →

Lead sponsor

Uppsala University is the lead sponsor of 381 studies on the registry; 84 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
50 Years to 80 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Pseudoclaudication in one or both legs and backpain (VAS>30)
  • MRI with 1-2 adjacent stenotic segments (area \<0.75 mm2)between L2 and sacrum
  • Duration of symptoms >6 months
  • Informed consent

Exclusion criteria

Exclusion Criteria:

  • Spondylolysis
  • Degenerative lumbar scoliosis (Cobb angle >20 deg)
  • History of lumbar spinal surgery for spinal stenosis or instability
  • Stenosis not caused by degenerative changes
  • Stenosis caused by herniated disc
  • Other specific spinal conditions, Mb Bechterew, malignancy, neurologic disorders
  • History of vertebral compression fractures in affected segments
  • Psychological disorders where the surgeon considers participation inappropriate(dementia, drug abuse)
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
245 participants (actual)

Study arms

  • Experimental
    Decompression without fusion

    Surgery of the stenotic spinal segments with decompression of the neural elements without concommitant fusion.

    Procedure: Decompression without fusion

  • Experimental
    Decompression with fusion

    Surgery of the stenotic spinal segments with decompression of the neural elements with concommitant fusion.

    Procedure: Decompression with fusion

Interventions

  • ProcedureDecompression without fusion

    Decompressive surgery of both central and lateral component of the stenosis.

  • ProcedureDecompression with fusion

    Decompressive surgery of both central and lateral component of the stenosis AND concomitant instrumented or uninstrumented posterior fusion of decompressed segments.

06

What researchers measure

Primary outcomes

  1. Oswestry Disability Index (ODI)

    A difference in ODI of 12 at follow up between the two interventions is considered as significant.

    Time frame: 2 years

Secondary outcomes

  1. Back pain

    The visual analog scale (VAS 0-100) is used the evaluate pain. A difference of 20 between the interventions is considered significant.

    Time frame: 2 years

  2. Leg pain

    The visual analog scale (VAS 0-100) is used the evaluate pain. A difference of 20 between the interventions is considered significant.

    Time frame: 2 years

  3. EuroQol (EQ-5D)

    Measurement of quality of life

    Time frame: 2 years

  4. Swiss Spinal Stenosis Questionnaire

    A disease-specific self-report outcome instrument commonly used in trials to measure treatment outcomes in patients with lumbar spinal stenosis. The Swiss Spinal Stenosis Questionnaire quantifies severity of symptoms, physical function characteristics, and patient's satisfaction after treatment. It was designed to complement existing generic measures of lumbar spine disability and health status in the evaluation of patients with lumbar spinal stenosis.

    Time frame: 2 years

07

Study locations

No study locations are listed for this record.

08

References and documents

Publications

  • Forsth P, Olafsson G, Carlsson T, Frost A, Borgstrom F, Fritzell P, Ohagen P, Michaelsson K, Sanden B. A Randomized, Controlled Trial of Fusion Surgery for Lumbar Spinal Stenosis. N Engl J Med. 2016 Apr 14;374(15):1413-23. doi: 10.1056/NEJMoa1513721. PubMed 27074066 ↗
09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 17, 2015, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT01994512
Lead sponsor
Uppsala University
Responsible party
Sponsor
First posted
Nov 25, 2013
Start date
Oct 2006
Primary completion
Jun 2012
Completion
Jun 2014
Last update
Dec 17, 2015

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Dec 2015. You cannot join it, but the record below documents what was studied.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Start the discussion