An interventional study of High-intensity focused ultrasound for Sacroiliitis using the Neurolyser XR in Sacroiliitis, sponsored by FUSMobile Inc.. Active, not recruiting at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-11-09.
Sponsored by FUSMobile Inc. · Not applicable, Interventional, and Treatment
The Neurolyser XR is a device used to deliver high-intensity focused ultrasound for the ablation of the lateral sacral branch nerve in patients with Sacroiliitis.
The sacroiliac joint connects the sacrum (a triangle shaped bone) with the iliac bone on both sides of the lower spine. These joints transmit all the forces from the upper body to the pelvis and their respective legs. Repeated trauma and aging affect this joint resulting in inflammation and arthritic changes. These changes result in misalignment of the joint or limitation to normal motion which can create pain typically very low in the back or in the buttocks,
High-Intensity Focused Ultrasound (HIFU) technology uses sound waves. These sound waves are concentrated into a specific spot in order to raise the local tissue temperature causing a burn, this burn is expected to intentionally damage the nerve causing pain.
The HIFU device used in this study is called, the Neurolyser XR. It focuses sound wave energy directly on the nerve of the painful sacroiliac joint, causing an increase in temperature, which is expected to directly damage the nerve fibers which carry pain signals to the brain.
42 studies on the registry are indexed under Sacroiliitis; 11 are open to participants now.
This study's planned enrollment of 10 is below the median of 48 across 28 interventional studies indexed under Sacroiliitis.
Browse Sacroiliitis studies →FUSMobile Inc. is the lead sponsor of 9 studies on the registry; 2 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
High-intensity focused ultrasound delivered to the lateral sacral branch nerve for neurolysis.
Device: High-intensity focused ultrasound for Sacroiliitis using the Neurolyser XR
HIFU is delivered via a non-invasive ultrasonic transducer, through a gel pad for acoustic coupling, into the patients body in a precise manner focused on the lateral sacral branch nerves.
The number of participants with treatment-related adverse events as assessed by Common Terminology Criteria for Adverse Events (CTCAE) v6.0.
Per the CTCAE assessment, each organ or possible adverse event would be categorized on a scale of 1 to 5 where: Grade 1 is Mild; asymptomatic or mild symptoms; clinical or diagnostic observations only; intervention not indicated. Grade 2 is Moderate; minimal, local, or noninvasive intervention indicated; limiting age-appropriate instrumental Activities of Daily Living (ADL). Grade 3 is Severe or medically significant but not immediately life-threatening; hospitalization or prolongation of hospitalization indicated; disabling; limiting self-care ADL. Grade 4 is Life-threatening consequences; urgent intervention indicated. Grade 5 is Death related to AE.
Time frame: Procedure through 6 month follow-up visit
The participants change in level of pain as assessed by the Numerical Rating Scale (NRS) and any change in analgesic/opiate usage.
The pain scale is 0 to 10 where 0 is no pain at all and 10 is the worst pain imaginable
Time frame: Procedure through 6 month follow-up visit
Change in quality of life will be assessed by Oswestry Disability Index (ODI)
ODI scale includes 10 questions, each can score 0 to 5 for a total score of 0 to 50. scores are interpreted as follows: 0-4: No disability 5-14: Mild disability 15-24: Moderate disability 25-34: Severe disability 35-50: Completely disabled
Time frame: Procedure through 6 month follow-up visit
Change in quality of life will be assessed also by Brief Pain Inventory (BPI-QOL)
BPI includes 7 questions on the level the patient pain interferes with their daily activities. Each question can score 0 to 10 for a total score of 0 to 70.
Time frame: Procedure through 6 month follow-up visit
Plan to share: No
Started Sep 2024 (actual). Primary completion is estimated for May 2027, 32 months after the start.
Since we started tracking on Sep 25, 2026, the dates moved once, on Nov 9, 2026: primary completion Sep 2026 → May 2027 and completion Dec 2026 → Jul 2027.
Earlier changes are on the record history on ClinicalTrials.gov ↗
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is active, not recruiting, as verified in Nov 2026. You cannot join it, but the record below documents what was studied.
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FUSMobile Inc.