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Status unknownNCT06000709Updated Oct 10, 2023

Comparison Between Ultrasound-Guided Genicular Nerve Phenol Neurolysis and Intra-articular Steroid Injections

A Phase 4 interventional study of 6% aqueous phenol and MethylPREDNISolone 40 MG in Osteoarthritis, Knee and Chronic Knee Pain, sponsored by University of Manitoba. Status unknown. Open to participants aged 40 Years to 80 Years. Per ClinicalTrials.gov, last updated 2023-10-10.

Sponsored by University of Manitoba · Phase 4, Interventional, and Treatment

The sponsor has not verified this record recently (last verified Oct 2023), so the status shown — last known as Not yet recruiting — may be out of date.
Phase
Phase 4
Study type
Interventional
Enrollment
40
Allocation
Randomized
Ages
40 Years to 80 Years
Sex
All
01

Study summary

Genicular nerve neurolysis (GN) constitutes a relatively novel technique, whereby different chemical compounds (i.e. alcohol, phenol) are injected in close proximity to the genicular nerves of the knee joint, with the intention to exert a neurolytic effect by denaturing proteins resulting in Wallerian degeneration distal to the lesion. Based on the preliminary evidence and considering the potential benefits of the technique, we hypothesized that ultrasound-guided genicular chemical neurolysis with phenol is superior in terms of pain relief at 3 months, when compared to intra-articular steroid (IAS) injection.

Read the detailed description

This study will allow us to determine if ultrasound-guided phenol genicular neurolys is superior to intra-articular steroid injection in terms of analgesia and functional outcomes, providing a more effective and long-lasting alternative for patients with chronic knee pain secondary to osteoarthritis

02

Conditions studied

  • Osteoarthritis, Knee
  • Chronic Knee Pain

Keywords

  • Phenol
  • Injections, Intra-Articular
  • Steroids
  • Nerve Block
03

In context

Osteoarthritis, Knee

3,391 studies on the registry are indexed under Osteoarthritis, Knee; 628 are open to participants now.

This study's planned enrollment of 40 is below the median of 69 across 2,808 interventional studies indexed under Osteoarthritis, Knee.

Browse Osteoarthritis, Knee studies →

Lead sponsor

University of Manitoba is the lead sponsor of 554 studies on the registry; 88 are open to participants now.

Of its 12 completed or terminated interventional studies of FDA-regulated products, 5 (42%) have results posted.

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

04

Who can participate

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

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.

Inclusion criteria

  • Severe knee pain for more than 6 months, defined as Numeric rating scale (NRS) score of 6 and greater, unresponsive to conservative medical treatment
  • Radiological OA grade 2 to 4 (Kellgren-Lawrence scale)

Exclusion criteria

Exclusion Criteria:

  • Previous total knee replacement on the index knee
  • Prior knee radiofrequency ablation on the index knee
  • Connective tissue diseases with knee involvement (e.g. rheumatoid arthritis)
  • Body mass index ≥ 40 kg/m2
  • Uncontrolled coagulopathy, defined as supratherapeutic dose of anticoagulation medication
  • Allergy to local anesthetics
  • Unstable opioid consumption, defined as an increase >10% in dosage during the last 3 months prior to recruitment.
05

Study design

Phase
Phase 4
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Outcomes assessor)
Enrollment
40 participants (estimated)

Study arms

  • Experimental
    Ultrasound-guided Genicular Nerve Phenol Neurolysis

    One time injection of 1.5 mL of phenol 6% at 3 target locations: superomedial, superolateral and inferomedial genicular nerves

    Drug: 6% aqueous phenol · Drug: Intraarticular Knee Placebo

  • Active comparator
    Ultrasound-guided Intraarticular Steroid Injection

    Intraarticular knee injection of 40 mg of methylprednisolone acetate in a volume of 5 mL of saline

    Drug: MethylPREDNISolone 40 MG · Drug: Genicular Nerve Placebo

Interventions

  • Drug6% aqueous phenol

    1.5 mL of aqueous phenol will be injected at each target genicular nerve under ultrasound guidance

  • 40 mg of methylprednisolone diluted in 5 mL of 0.9% normal saline will be injected inside the knee joint capsule under ultrasound guidance

  • DrugIntraarticular Knee Placebo

    Single injection 1.5 mL of 0.9% normal saline outside the knee joint capsule under ultrasound guidance

    Also known as: 0.9% normal saline

  • DrugGenicular Nerve Placebo

    1.5 mL of 0.9% normal saline will be injected subcutaneously at each target genicular nerve under ultrasound guidance

    Also known as: 0.9% normal saline

06

What researchers measure

Primary outcomes

  1. Pain scores (Numeric Rating Scale) at 3 months

    Knee pain intensity using Numeric Rating Scale ranging from 0 to 10 (0 = no pain and 10 = worst imaginable pain)

    Time frame: 3 months

Secondary outcomes

  1. Pain scores (Numeric Rating Scale) at baseline, 1 and 6 months

    Knee pain intensity using Numeric Rating Scale ranging from 0 to 10 (0 = no pain and 10 = worst imaginable pain)

    Time frame: baseline, 1 month, 6 months

  2. Proportion of patients experiencing a 50% or greater decrease in baseline knee pain scores (NRS)

    Knee pain intensity using Numeric Rating Scale ranging from 0 to 10 (0 = no pain and 10 = worst imaginable pain)

    Time frame: 1 months, 3 months, 6 months

  3. Brief Pain Inventory Score (BPI)

    Functional activity measurement using the Brief Pain Inventory (short form)

    Time frame: baseline, 1 month, 3 months, 6 months

  4. WOMAC index

    The WOMAC index consists of three subscales: pain, stiffness, and physical function (17 questions overall)

    Time frame: baseline, 1 month, 3 months, 6 months

  5. Incidence of adverse events

    Determined by the presence of hypoesthesia, paresthesia, puncture site hematoma, and worsening pain or infection

    Time frame: from injection up to 1 month after intervention

07

Study locations

No study locations are listed for this record.

08

References and documents

Publications

  • Walega DR, McCormick ZL. Chemical Neurolysis of the Genicular Nerves for Chronic Knee Pain: Reviving an Old Dog and an Old Trick. Pain Med. 2018 Sep 1;19(9):1882-1884. doi: 10.1093/pm/pny023. No abstract available. PubMed 29514315 ↗
  • Risso RC, Ferraro LHC, Nouer Frederico T, Peng PWH, Luzo MV, Debieux P, Sakata RK. Chemical Ablation of Genicular Nerve with Phenol for Pain Relief in Patients with Knee Osteoarthritis: A Prospective Study. Pain Pract. 2021 Apr;21(4):438-444. doi: 10.1111/papr.12972. Epub 2020 Dec 29. PubMed 33277760 ↗
  • Park Y, Lee SC, Nam HS, Lee J, Nam SH. Comparison of sonographically guided intra-articular injections at 3 different sites of the knee. J Ultrasound Med. 2011 Dec;30(12):1669-76. doi: 10.7863/jum.2011.30.12.1669. PubMed 22124002 ↗
  • Davis T, Loudermilk E, DePalma M, Hunter C, Lindley D, Patel N, Choi D, Soloman M, Gupta A, Desai M, Buvanendran A, Kapural L. Prospective, Multicenter, Randomized, Crossover Clinical Trial Comparing the Safety and Effectiveness of Cooled Radiofrequency Ablation With Corticosteroid Injection in the Management of Knee Pain From Osteoarthritis. Reg Anesth Pain Med. 2018 Jan;43(1):84-91. doi: 10.1097/AAP.0000000000000690. PubMed 29095245 ↗

Individual participant data

Plan to share: No

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Start is estimated for Oct 2023; primary completion for Jan 2024, 3 months later.

Of 84 non-industry phase 4 interventional studies under Osteoarthritis, Knee, half reached primary completion within 20 months of starting (the median), counting those still running; a quarter within 10 and three quarters within 37. This study's planned 3 months is below that.

Counting every sponsor, half of 94 studies reached it within 20 months; a quarter within 9 and three quarters within 37.

How these figures are worked out, and which studies are left out of them.

Registered
Aug 14, 2023
First posted
Aug 21, 2023
StartEst.
Oct 20, 2023
Primary completionEst.
Jan 31, 2024
CompletionEst.
Jul 31, 2024
Last update
Oct 10, 2023
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Oct 10, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06000709
Responsible party
Javier Webar (Assistant Professor, University of Manitoba) — Principal investigator
First posted
Aug 21, 2023
Start date
Oct 20, 2023 (estimated)
Primary completion
Jan 31, 2024 (estimated)
Completion
Jul 31, 2024 (estimated)
Last update
Oct 10, 2023

Study contacts

Javier Webar, MD
Contact
javier.webar@umanitoba.ca
2047873018
Sebastian Layera, MD
Contact
layerars@myumanitoba.ca
2047873018
Javier Webar, MD
principal investigator · University of Manitoba

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is status unknown, as verified in Oct 2023. You cannot join it, but the record below documents what was studied.

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