Plain English Summary
Background and study aims
Spinal cord stimulation (SCS) involves implanting a device that delivers small electrical fields to the spinal cord to provide pain relief in patients with chronic (long-term), intractable (hard to control) back and leg pain. Significant leg pain relief has been reported with traditional SCS which uses a low frequency (<1200 Hz), but there is limited long-term data supporting the use of low frequency SCS in predominant back pain patients. Recent studies testing SCS using a frequency of 10 kHz (HF10 Therapy™) have shown that this treatment is effective and safe in patients with both back and leg pain. The results from these studies demonstrated that these patients had significant pain relief up to 24 months. The decreased pain in both back and leg were consistent throughout the studies with improvements in functional capacity with no perception of paresthesia (a burning or prickling sensation). The aim of this study is to test the performance of HF10 therapy in European patients with leg pain, as per centers’ routine practice.
Who can participate?
Patients aged over 18 with chronic, intractable leg pain
What does the study involve?
Participants undergo Spinal Cord Stimulation (SCS) at 10 kHz (HF10 therapy) as per the center’s usual practice. SCS involves the surgical placement of two leads (which look like very thin wires) into a small area near the spinal cord. Electrical stimulation is delivered through these wires by a small, battery-operated, rechargeable SCS implanted generator. Each patient is followed for 12 months after device activation. The participants attend regular clinic visits to complete questionnaires and to provide feedback on their pain. Successfully treated participants get a permanent device implanted as per center’s routine clinical practice.
What are the possible benefits and risks of participating?
Participants may benefit from the SCS system to relieve their pain. There are no direct risks of taking part in this study, although the general risks of having a spinal stimulation device in place apply.
Where is the study run from?
Up to 15 pain centers across Europe
When is the study starting and how long is it expected to run for?
July 2017 to December 2021
Who is funding the study?
Nevro Corp (USA)
Who is the main contact?
1. Mrs Pascalle Reiters (scientific)
2. Mr Wim Laloo (public)
A multi-center prospective observational clinical study to evaluate HF10™ therapy in patients with chronic intractable leg pain
The aim of this study is to evaluate and to document the clinical performance of HF10 therapy in patients with chronic intractable leg pain, as per the center’s routine practice (on-label use of CE marked device).
Not provided at time of registration
Multi-center prospective observational clinical study
Primary study design
Secondary study design
Patient information sheet
Not available in web format, please use the contact details to request a patient information sheet
Chronic, intractable leg pain
As part of their standard care, participants undergo a trial (temporary evaluation period) of Spinal Cord Stimulation (SCS) at 10 kHz (HF10 Therapy) as per the center’s usual practice and following this, those for whom the trial treatment was successful have a permanent device implanted as per center’s routine clinical practice.
Following device activation, participants are followed for a period of 12 months. The participants attend regular clinic visits, at 1, 3, 6, 9 and 12 months, to complete questionnaires, and to provide feedback on their pain, quality of life, disability, health status, satisfaction and sleep. At these visits, the physicians will take assessments from the participants such as pain evaluation, medication usage and side effects (if any).
Primary outcome measure
Responder rate at 3 months (a responder is defined as a subject who experiences ≥50% leg pain reduction compared to baseline as assessed by VAS)
Secondary outcome measures
1. Percentage of subjects with a successful trial phase, defined as at least 50% leg pain reduction as assessed by VAS at the End of Trial phase
2. Change from baseline in mean leg pain, assessed by VAS at End of Trial, 1, 3, 6, 9 and 12 months
3. Change from baseline in mean back pain, assessed by VAS at baseline, End of Trial, 1, 3, 6, 9 and 12 months
3. Percentage change from baseline in mean leg pain, assessed by VAS at End of the Trial, 1, 3, 6, 9 and 12 months
4. Percentage change from baseline in mean back pain, assessed by VAS at End of the Trial, 1, 3, 6, 9 and 12 months*
5. Percentage of subjects who experience at least 50% reduction in leg pain assessed by VAS compared to baseline at End of Trial, 1, 3, 6, 9 and 12 months
6. Percentage of subjects who experience at least 50% reduction in back pain assessed by VAS compared to baseline at End of Trial, 1, 3, 6, 9 and 12 months*
7. Change from baseline in quality of life, assessed by Short-Form Health Survey (SF-12) at 3, 6 and 12 months
8. Change from baseline in disability, assessed by Oswestry Disability Index (ODI) at 3, 6 and 12 months
9. Opioid usage, measured using standard clinical question to the subject and collection via a CRF, at baseline, end of SCS trial period, 1, 3, 6, 9 and 12 months
10. Subject's impression of change in general health status, assessed by the Patient Global Impression of Change instrument (PGIC) at End of Trial, 1, 3, 6, 9 and 12 months
11. Investigator’s impression of change in the subject’s general health status, assessed by the Clinician Global Impression of Change instrument (CGIC) at End of Trial, 1, 3, 6, 9 and 12 months
12. Incidence of unanticipated adverse device effects (UADEs), measured using standard clinical question to the subject and collection via a CRF, at baseline, end of trial, 1, 3, 6, 9 and 12 months
13. Change from baseline in Short-Form McGill Pain Questionnaire (SF-MPQ-2) at 3, 6 and 12 months
14. Participant satisfaction with the therapy, measured using the Subject Satisfaction questionnaire at 3 and 12 months
15. Change from baseline in health status , assessed by EQ-5D-5L at 3, 6 and 12 months
16. Change from baseline in sleep disturbance, assessed by the Pain and Sleep Questionnaire three-item Index (PSQ-3) at End of Trial, 1, 3, 6, 9 and 12 months
17. Work status, measured using the standard clinical question to the subject and collection via a CRF, at baseline and 12 months
(* for subjects with a baseline back pain VAS > 5.0)
Overall trial start date
Overall trial end date
Reason abandoned (if study stopped)
Participant inclusion criteria
1. Leg pain either idiopathic in origin or from failed back surgery syndrome which has been refractory to conservative therapy for a minimum of 3 months
2. Leg pain intensity of ≥ 5 out of 10 cm on the Visual Analog Scale (VAS) at enrollment
3. Neuropathic pain as clinically determined by the investigator
4. On stable pain medications, as determined by the Investigator, for at least 4 weeks prior to the Baseline Visit
5. Be an appropriate candidate for HF10 therapy according to the current labeling of the device
6. At least 18 years of age at time of enrollment
7. Completed evaluation at the investigational site at least once prior to screening for the pain condition related to the study
8. Willing and able to comply with study-related requirements, procedures and visits
9. Capable of subjective evaluation, able to read and understand written questionnaires, and able to read, understand and sign the written informed consent
Target number of participants
At least 100 study participants with a permanent device implant will be evaluated at the primary endpoint at 3 months
Participant exclusion criteria
1. A medical condition or pain in other area(s), not intended to be treated with SCS, that could interfere with study assessments, accurate pain reporting, and/or confound evaluation of study endpoints
2. Evidence of an active disruptive psychological or psychiatric disorder or other known condition significant enough to impact perception of pain, compliance of intervention and/or ability to evaluate treatment outcome, as determined by the investigator in consultation with a clinical psychologist if applicable
3. A current diagnosis of a progressive neurological disease such as multiple sclerosis, chronic inflammatory demyelinating polyneuropathy, rapidly progressive arachnoiditis, rapidly progressive diabetic peripheral neuropathy, brain or spinal cord tumor, or severe/critical spinal stenosis
4. A visceral pain in the area being treated
5. A current diagnosis of a coagulation disorder, bleeding diathesis, progressive peripheral vascular disease or uncontrolled diabetes mellitus
6. A diagnosis of scoliosis that precludes lead placement
7. Leg pain that occurs only with weight bearing
8. Benefitting within 30 days prior to enrollment from an interventional procedure and/or surgery to treat back and/or leg pain
9. Existing drug pump and/or SCS system or another active implantable device such as a pacemaker (switched On or Off)
10. Have a condition currently requiring or likely to require diathermy
11. Metastatic malignant disease or active local malignant disease
12. A life expectancy of less than 1 year
13. An active systemic or local infection
14. Pregnant (if female and sexually active, subject must be using a reliable form of birth control, be surgically sterile or be at least 2 years post-menopausal)
15. Within 6 months of enrollment a significant untreated addiction to dependency producing medications or have been a substance abuser (including alcohol and illicit drugs)
16. Concomitantly participating in another clinical study, or planned to be enrolled in another clinical study that could interfere in participation in this study or affect the scientific soundness of this study
17. Involved in an injury claim under current litigation
18. A pending or approved work cover claim
Recruitment start date
Recruitment end date
Countries of recruitment
Belgium, Germany, Italy, Spain, Sweden, United Kingdom
Trial participating centre
Trial participating centre
Wessex Neurological Centre
University Hospital Southampton NHS Foundation Trust Southampton General Hospital Tremona Road
1800 Bridge Parkway
United States of America
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
1. Planned presentation of results to international congresses from the start of 2020
2. Planned publication in a peer-reviewed journal from the end of 2020
3. Additional documents (such as study protocol, statistical analysis plan, other) will be available upon request
IPD sharing statement
The datasets generated during and/or analysed during the current study are/will be available upon request from Pascalle Reiters.
Intention to publish date
Participant level data
Available on request
Basic results (scientific)