Clinical trial NCT05372822: Burst Crossover Trial
Official title: Spinal Cord Burst Stimulation for Chronic Radicular Pain Following Lumbar Spine Surgery: a Randomized Double-blind Sham-controlled Crossover Trial
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Back Pain with Radiation
Pain, Postoperative
Keywords: Lumbar Vertebrae
Surgery
Postoperational Complications
Spinal Cord Stimulation
Lead sponsor: St. Olavs Hospital
Sponsor class: OTHER
Collaborators: name: Norwegian University of Science and Technology
First posted: 2022-05-13
Enrollment: 50
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: Spinal cord stimulation (SCS) is a widely applied therapy to treat chronic neuropathic pain, and one of the most common indications is persisting radicular neuropathic pain following lumbar spine surgery. In traditional SCS therapies, the objective has been to replace the pain sensation with paresthesia. The anticipation is that the electrical current alters pain processing by masking the sensation of pain with a comfortable tingling or paresthesia. Although patients mostly cope with paresthesia, a significant proportion reports that the sensation is unpleasant.

'Burst' SCS utilizes complex programming to deliver high-frequency stimuli. This SCS technique seems to provide paresthesia-free stimulation, resulting in better pain relief of low back and leg pain then traditional tonic stimulation.

The widespread use of SCS has not been backed by solid evidence. The absence of placebo-controlled trials has long been an important point of criticism, but due to the nature of the intervention with sensation of paresthesia, studies with placebo control have so far not been considered possible. When 'burst' SCS is used the stimulation is often unnoticed by the patient, allowing comparison with placebo stimulation.

The aim of this randomized double-blind sham-controlled crossover trial is to evaluate the efficacy of 'burst' spinal cord stimulation for chronic radicular pain following spine surgery.


Eligibility criteria: Inclusion Criteria:

* Have undergone ≥1 back surgeries and developed chronic radicular pain that has remained refractory to non-surgical treatment for ≥6 months
* Minimum pain intensity of 5/10 on the leg pain NRS at baseline
* Successful two-week SCS testing period with tonic stimulation (≥2 points reduction in leg pain NRS from baseline). This means patients will experience paresthesia during the SCS trial period
* Mandatory assessment at the Multidisciplinary outpatient clinic for back-, neck- and shoulder rehabilitation, St. Olavs University Hospital
* Successful two-week SCS testing period with tonic stimulation (≥50% reduction in leg pain NRS from baseline). This means patients will experience paresthesia during the SCS trial period

Exclusion Criteria:

* Coexisting conditions that would increase procedural risk (e.g., sepsis, coagulopathy)
* History of laminectomy or posterior fusion at the thoracolumbar junction, where percutaneous electrode end tips are routinely placed.
* Abnormal pain behavior and/or unresolved psychiatric illness.
* Unresolved issues of secondary gain or inappropriate medication use.

Primary outcomes:
measure: change in disease-specific functional outcome from baseline
timeFrame: 12 months
Secondary outcomes:
measure: Change in generic health-related quality of life measured with the Euro-Qol-5D (5L)
timeFrame: 12 months
measure: Change in back pain
timeFrame: 12 months
measure: change in leg pain
timeFrame: 12 months
measure: Daily physical activity
timeFrame: 12 months
measure: Six-month follow-up of pain-related disability
timeFrame: 18 months
Other outcomes:
Locations:
city: Trondheim
country: Norway
facility: St Olavs Hospital
Study officials:
affiliation: St. Olavs Hospital
name: Sasha Gulati, md prof
role: PRINCIPAL_INVESTIGATOR
affiliation: St. Olavs Hospital
name: Geir Bråthen, md prof
role: STUDY_DIRECTOR
References: