Can a nerve procedure outlast another for stubborn knee pain?
NCT ID NCT07805161
First seen Sep 04, 2026 · Last updated Sep 04, 2026
Summary
This study compares two ultrasound-guided procedures that target nerves around the knee to relieve chronic osteoarthritis pain that has not improved with standard care. One procedure uses heat from radiofrequency to disable the nerves, while the other uses a chemical called phenol. Researchers will measure pain levels and knee function before treatment and at 4, 12, and 24 weeks after, to see which approach offers better and safer relief.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Two procedures: ultrasound-guided bipolar radiofrequency ablation and ultrasound-guided phenol chemical neurolysis of the genicular nerves
- What this could lead to
- If one procedure proves more effective, it could offer a longer-lasting, non-surgical option for people with knee osteoarthritis pain that has not responded to other treatments.
- What could go wrong
- This is an observational study, not a randomized trial, so results may be influenced by patient differences. Pain relief may be temporary, and procedures carry risks like infection, bleeding, or nerve damage.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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69 people
The number who actually took part.
- Started
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Aug 2024
- Finished
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Jun 2025
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 75 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Adults aged 18 to 75 years * Unilateral moderate-to-severe knee pain due to gonarthrosis * Numeric Rating Scale (NRS) score ≥6 * Knee pain lasting longer than 6 months * Radiological diagnosis of knee osteoarthritis, Kellgren-Lawrence grade 2-4 * Failure of conservative treatments, including analgesic medications, physical therapy, or intra-articular injections * At least 50% pain relief after diagnostic genicular nerve block * Ability to provide written informed consent Exclusion Criteria: * Knee pain due to causes other than osteoarthritis, such as fracture, trauma, spinal disorder, or inflammatory arthritis * Previous knee surgery * Knee joint effusion detected on physical examination or ultrasound * Cognitive impairment * Hepatic or renal failure * Severe psychiatric disorder * Local or systemic infection * Coagulopathy * Current use of antiplatelet or anticoagulant therapy * Presence of a pacemaker * Intra-articular injection or interventional knee procedure within the previous 6 months
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University Of Health Sciences, Gulhane School Of Medicine, Department Of Algology
Ankara, Etlik, 06010, Turkey (Türkiye)
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