Retrospective Study of the Results of Cooled Radiofrequency for Genicular Nerves Neurotomy in 40 Consecutive Patients With Osteoarthritis of the Knee and Painful Knee Arthroplasty

Study Overview
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Brief Summary
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Analyze the results of cooled radiofrequency in patients with chronic knee pain after one year of follow- up.

Detailed Description
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The investigators performed a retrospective case-series reviewed of 40 patients who underwent cooled RF of genicular nerves. The investigators evaluated results of the survey of quality of life (SF36), knee society score (KSS) and the Visual Analogue Scale (VAS).

Official Title
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Pain Treatment With Cooled Radiofrequency in Osteoarthritis and Total Knee Arthroplasty: Case Series in Hospital Universitario de Son Espases

Conditions
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Osteoarthritis, Knee

Intervention / Treatment
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* Procedure: cooled radiofrequency ablation of genicular nerves


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Chronic knee pain (older than 3 months, with no response to physiotherapy, medication or hyaluronic acid infiltration) with a pain intensity according to VAS>7/10 The radiological criteria were witness of OA with Kellgren-Lawrence index of 2 to 4. Painful TKA with no apparent cause and with a radiological image where a proper placement was observed Exclusion Criteria: Infection or lymphangitis of the member Acute knee pain Corticoids or hyaluronic acid infiltration with a high molecular weight prior to the surgery Pregnancy Severe neurological or psychiatric disorders Patients with pacemakers

Ages Eligible for Study
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Minimum Age: 40 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Procedure: cooled radiofrequency ablation of genicular nerves|Cooled RF consists of creating an injury in the nerve trough a high frequency flow. Unlike conventional RF, in cooled RF through a closed circuit where intravenous flows, we can create an injury for a longer period of time, at a lower temperature (standard RFA 90º C, cooled RFA 60º C) and within an area 8 times larger. As the lesion is spherical, and larger (about 10-12 mm in diameter), the chances of neurolysis of the nerve increase.|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Treatment success was defined as the number of subjects whose knee pain is reduced by ± 50% based on the Visual Analogue Scale (VAS). | The VAS is a 11- point scale (0 points to 10 points), where 0 points equals no pain and 10 points equals the worst pain. | one year after the procedure | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Short Form (36) Health Survey | The SF36 values eight parameters: physical function, social function, physical role, emotional role, mental health, vitality, pain and general health. Zero is the worst conceivable health and 100 the best. | one year after the procedure | 
| Knee Society Score (KSS) | The KSS consists of two parts. KS measures pain, range of motion, stability and alignment. FS measures the distance able to walk, the difficulty in going up or down stairs and the need for walking aids. The result is rated as excellent (80-100), good (70-79), regular (60-69) and bad (<60). | one year after the procedure | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Cooled radiofrequency, chronic knee pain, knee arthroplasty, genicular nerve