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Lyman JR, Olscamp AJ, Lovell TP, Winegar CD, Wilson AN. Radiofrequency ablation prior to total knee arthroplasty does not improve post-surgical pain or recovery: a double-blinded, multi-center, randomized clinical trial. Ann Jt 2023; 8:5. [PMID: 38529234 PMCID: PMC10929435 DOI: 10.21037/aoj-22-33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 01/06/2023] [Indexed: 03/27/2024]
Abstract
Background Radiofrequency ablation (RFA) targeting the genicular nerves is an effective treatment for knee pain due to osteoarthritis. The aim of this study was to determine the effects of two RFA interventions delivered preoperatively on early postoperative pain management and subjective outcomes after total knee arthroplasty (TKA). Methods One hundred forty-three participants were enrolled in this double blinded, sham-controlled prospective randomized trial. Participants assigned at random to traditional RFA (t-RFA) (n=50), cooled RFA (c-RFA) (n=49), or sham (n=44) procedures prior to TKA. Outcomes were recorded at postoperative day 3, week 1, week 2, week 12, month 6, and month 12 following TKA. Primary outcomes included hospital length of stay (LOS), opioid consumption (reported as MEQ, or daily morphine equivalents), time to narcotic cessation (reported in days), and pain scores (reported as NRS, or Numeric Rating Scale). Secondary outcomes included Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) measures. All side effects and complications were reported. Participants were followed for a year to detect any unexpected side effects. Results Compared with sham controls, t-RFA and c-RFA did not affect inpatient LOS, pain scores, or opioid consumption. There were no reductions in time to opioid cessation, pain scores, or WOMAC scores at any time point post-TKA. Conclusions RFA of the genicular nerves prior to TKA did not affect opioid use or time to cessation, pain, or WOMAC scores, following TKA. Current techniques of t-RFA and c-RFA of these specific geniculate nerves preoperatively are not indicated as routine interventions to improve short-term surgical recovery after TKA. Trial Registration The trial was registered on ClinicalTrials.gov (NCT02925442).
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Affiliation(s)
- Jeffrey R. Lyman
- Orthopedic Sports Institute, Coeur d’Alene, ID, USA
- Institute for Orthopedic Research and Innovation, Coeur d’Alene, ID, USA
| | - Adam J. Olscamp
- Orthopedic Sports Institute, Coeur d’Alene, ID, USA
- Institute for Orthopedic Research and Innovation, Coeur d’Alene, ID, USA
| | - Timothy P. Lovell
- Institute for Orthopedic Research and Innovation, Coeur d’Alene, ID, USA
- Providence Orthopedics, Spokane, WA, USA
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Hunter CW, Deer TR, Jones MR, Chang Chien GC, D'Souza RS, Davis T, Eldon ER, Esposito MF, Goree JH, Hewan-Lowe L, Maloney JA, Mazzola AJ, Michels JS, Layno-Moses A, Patel S, Tari J, Weisbein JS, Goulding KA, Chhabra A, Hassebrock J, Wie C, Beall D, Sayed D, Strand N. Consensus Guidelines on Interventional Therapies for Knee Pain (STEP Guidelines) from the American Society of Pain and Neuroscience. J Pain Res 2022; 15:2683-2745. [PMID: 36132996 PMCID: PMC9484571 DOI: 10.2147/jpr.s370469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 08/12/2022] [Indexed: 11/23/2022] Open
Abstract
Knee pain is second only to the back as the most commonly reported area of pain in the human body. With an overall prevalence of 46.2%, its impact on disability, lost productivity, and cost on healthcare cannot be overlooked. Due to the pervasiveness of knee pain in the general population, there are no shortages of treatment options available for addressing the symptoms. Ranging from physical therapy and pharmacologic agents to interventional pain procedures to surgical options, practitioners have a wide array of options to choose from – unfortunately, there is no consensus on which treatments are “better” and when they should be offered in comparison to others. While it is generally accepted that less invasive treatments should be offered before more invasive ones, there is a lack of agreement on the order in which the less invasive are to be presented. In an effort to standardize the treatment of this extremely prevalent pathology, the authors present an all-encompassing set of guidelines on the treatment of knee pain based on an extensive literature search and data grading for each of the available alternative that will allow practitioners the ability to compare and contrast each option.
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Affiliation(s)
- Corey W Hunter
- Ainsworth Institute of Pain Management, New York, NY, USA.,Department of Rehabilitation & Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Timothy R Deer
- The Spine and Nerve Center of the Virginias, Charleston, WV, USA
| | | | | | - Ryan S D'Souza
- Department of Anesthesiology, Mayo Clinic, Rochester, MN, USA
| | | | - Erica R Eldon
- Department of Rehabilitation & Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | - Johnathan H Goree
- Department of Anesthesiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Lissa Hewan-Lowe
- Department of Rehabilitation & Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jillian A Maloney
- Department of Anesthesiology, Division of Pain Medicine, Mayo Clinic, Phoenix, AZ, USA
| | - Anthony J Mazzola
- Department of Rehabilitation & Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | | | | | - Jeanmarie Tari
- Ainsworth Institute of Pain Management, New York, NY, USA
| | | | | | - Anikar Chhabra
- Department of Orthopedic Surgery, Mayo Clinic, Phoenix, AZ, USA
| | | | - Chris Wie
- Interventional Spine and Pain, Dallas, TX, USA
| | - Douglas Beall
- Comprehensive Specialty Care, Oklahoma City, OK, USA
| | - Dawood Sayed
- Department of Anesthesiology, Division of Pain Medicine, University of Kansas Medical Center, Kansas City, KS, USA
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Cheppalli N, Bhandarkar AW, Sambandham S, Oloyede SF. Safety and Efficacy of Genicular Nerve Radiofrequency Ablation for Management of Painful Total Knee Replacement: A Systematic Review. Cureus 2021; 13:e19489. [PMID: 34912630 PMCID: PMC8665972 DOI: 10.7759/cureus.19489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2021] [Indexed: 11/05/2022] Open
Abstract
Painful total knee replacement (TKR) without an obvious underlying identifiable pathology is not uncommon. Dissatisfaction after TKR can be up to 20%. Different treatment modalities, including non-operative and operative procedures, have been described in the literature. Radiofrequency ablation of genicular nerves (GNRFA) is emerging as a newer treatment modality for painful TKR without an obvious underlying identifiable pathology. Despite a modest number of publications demonstrating the usefulness of GNRFA in managing pain in knee osteoarthritis, the efficacy of GNRFA has not been completely established in the management of residual pain after TKR. This systematic review aimed to analyze all published studies (nine studies) on GNRFA as an option to manage residual pain after TKR. Based on this current systematic review, we noted that GNRFA is a modality to treat post residual pain and patients can anticipate improvement in pain up to three months with minimal complications. This article provides an overview of the currently available knowledge and techniques employed for this procedure, as well as the expected outcome and safety profile of GNRFA in painful TKR.
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Affiliation(s)
- Naga Cheppalli
- Orthopaedics, University of New Mexico School of Medicine, Albuquerque, USA
| | | | - Senthil Sambandham
- Orthopedics, University of Texas Southwestern Medical Center, Dallas, USA
| | - Solomon F Oloyede
- Orthopaedics, University of New Mexico School of Medicine, Albuquerque, USA
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Kocayiğit H, Beyaz SG. Comparison of cooled and conventional radiofrequency applications for the treatment of osteoarthritic knee pain. J Anaesthesiol Clin Pharmacol 2021; 37:464-468. [PMID: 34759563 PMCID: PMC8562443 DOI: 10.4103/joacp.joacp_126_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 02/09/2020] [Accepted: 04/28/2020] [Indexed: 12/02/2022] Open
Abstract
Background and Aims: Osteoarthritis is a progressive degenerative joint disease that affects the joint cartilage and surrounding tissues. It has been determined that osteoarthritis-induced knee pain is the most common cause of physical disability in the elderly. Material and Methods: In this study, the genicular nerve RF treatments of patients with osteoarthritic knee pain conducted at the Sakarya University Training and Research Hospital in the algology clinic of the Anaesthesiology and Reanimation Department between January 2016 and December 2016 were retrospectively examined. The preoperative and postoperative 2nd, 6th, and 12th week visual analog scale (VAS) and Turkish validated Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores were recorded. In addition, any complications after the treatment and side effects (bleeding, neurological damage, infection, etc.) were recorded in the file. Results: When the data of the patients were evaluated statistically, the preoperative VAS and WOMAC scores were found significantly decreased compared with the postoperative 2nd week, 6th week, and 12th week scores in patients who applied both conventional radiofrequency (RF) and cooled RF. However, there was no statistically significant difference between the two techniques. Conclusion: We found that both cooled and conventional RF techniques in genicular nerve ablation are similarly effective in reducing pain in patients with osteoarthritis-induced knee pain and improving patients’ physical functions. The complication rates are very low and there was no superiority to each other.
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Affiliation(s)
- Havva Kocayiğit
- Department of Anesthesiology, Sakarya University Training and Research Hospital, Sakarya, Republic of Turkey
| | - Serbülent Gökhan Beyaz
- Istinye University Faculty of Medicine, Department of Anesthesiology and Reanimation, Pain Medicine, Istanbul, Republic of Turkey
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Chang YW, Tzeng IS, Lee KC, Kao MC. Functional outcomes and physical performance of knee osteoarthritis patients after ultrasound-guided genicular nerve radiofrequency ablation. Pain Med 2021; 23:352-361. [PMID: 34534349 DOI: 10.1093/pm/pnab280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/12/2021] [Accepted: 09/15/2021] [Indexed: 01/12/2023]
Abstract
OBJECTIVE To elucidate the effectiveness of ultrasound-guided genicular nerve radiofrequency ablation in alleviating pain as well as its effects on functional outcomes, quality of life and physical performance in knee osteoarthritis patients. DESIGN Prospective observational study. SETTING Patients were recruited within one community hospital. SUBJECTS Patients with knee osteoarthritis. METHODS The subjects underwent ultrasound-guided radiofrequency ablation of genicular nerves after showing a positive response to a diagnostic block. Outcome assessments were performed at baseline and at 2 and 12 weeks posttreatments using the 36-item Short Form Health Survey (SF-36), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and a physical performance evaluation including balance tests, quadriceps muscle strength test, two-minute walking test and knee joint proprioception test. RESULTS Thirteen out of 38 patients were eligible for genicular nerve radiofrequency ablation. There were significant improvements from baseline to posttreatment in the numeric rating scale score, physical health domain score of SF-36, and pain and stiffness domain scores of the WOMAC. Regarding physical performance, the step test result significantly improved over the 12 weeks of follow-up. On the other hand, no significant deteriorations in the single leg stance test, isokinetic quadriceps muscle strength test, knee joint proprioception test or two-minute walking test results were observed after radiofrequency ablation of genicular nerves. CONCLUSIONS Radiofrequency ablation of genicular nerves may significantly alleviate pain and improve functional outcomes in knee osteoarthritis patients. More importantly, static balance control and quadriceps muscle strength were preserved and there was a change of proprioception in the good direction.
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Affiliation(s)
- Yi-Wei Chang
- Department of Rehabilitation Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan.,Graduate Institute of Injury Prevention and Control, College of Public Health, Taipei Medical University, Taipei, Taiwan
| | - I-Shiang Tzeng
- Department of Research, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan
| | - Kun-Chang Lee
- Department of Rehabilitation Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Ming-Chang Kao
- Department of Anesthesiology, New Taipei Municipal TuCheng Hospital (Built and Operated by Chang Gung Medical Foundation), New Taipei City, Taiwan
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Hong T, Li G, Han Z, Wang S, Ding Y, Yao P. Comparing the Safety and Effectiveness of Radiofrequency Thermocoagulation on Genicular Nerve, Intraarticular Pulsed Radiofrequency with Steroid Injection in the Pain Management of Knee Osteoarthritis. Pain Physician 2020; 23:S295-S304. [PMID: 32942789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
BACKGROUND Knee osteoarthritis (KOA) is characterized by the clinical symptoms of chronic knee pain and knee dysfunction, leading to disability and influencing the quality of life in severe cases. Radiofrequency treatment is a new method to reduce KOA-related pain and partially improve knee joint dysfunction without adverse effect. OBJECTIVE The present study aimed to assess the treatment efficacy of radiofrequency thermocoagulation on the genicular nerve (RFTGN) and intraarticular pulsed radiofrequency (IAPRF) for KOA. STUDY DESIGN Retrospective comparative study design. SETTING This study took place at Shengjing Hospital of China Medical University. METHOD KOA patients were randomly assigned to the RFTGN, IAPRF, and intraarticular steroid injection (IAS) groups. All procedures were performed under the guidance of computed tomography (CT). The observation indicators of this study were the numeric rating scale (NRS), Oxford knee scale (OKS), and perceived global effect (GPE). The time points for the assessment were 1-week, 1-month, 3-months, and 6-months after the treatment. RESULTS The postoperative NRS scores in the 3 groups decreased significantly at all the observation time points as compared to the pretreatment scores (P < 0.05). For the patients in the IAS group, the analgesic effect was in a rebound trend, which was the best at 1-week posttreatment, and was close to the preoperative level at 6-months posttreatment. The short-term (1 week or 1 month) analgesic effect of the RFTGN group was better than that of the IAPRF group, and was similar in the long-term (3 or 6 months). The long-term analgesic effect of RFTGN and IAPRF groups was better than that of IAS group. The results of the OKS score were similar to the NRS score. The RFTGN group showed markedly improved knee function in the long-term than the IAPRF and IAS groups. The short-term treatment satisfaction was similar in each group, and some differences were detected between the groups with respect to long-term treatment satisfaction. LIMITATION This study was a single-center retrospective study with a relatively small sample cohort and short follow-up periodCONCLUSION: Both RFTGN and IAPRF could alleviate the knee joint pain and improve the knee joint dysfunction; however, the treatment efficacy of RFTGN was better than that of IAPRF.
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Affiliation(s)
- Tao Hong
- Department of Pain Management, Shengjing Hospital of China Medical University, Shenyang, China
| | - Guangxiao Li
- Shengjing Hospital of China Medical University, Liaoning, China
| | - Zhenkai Han
- Shengjing Hospital of China Medical University, Liaoning, China
| | - Shimeng Wang
- Shengjing Hospital of China Medical University, Liaoning, China
| | - Yuanyuan Ding
- Department of Pain Management, Shengjing Hospital of China Medical University, Shenyang, China
| | - Peng Yao
- Department of Pain Management, Shengjing Hospital of China Medical University, Shenyang, China
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7
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Jamison DE, Cohen SP. Radiofrequency techniques to treat chronic knee pain: a comprehensive review of anatomy, effectiveness, treatment parameters, and patient selection. J Pain Res 2018; 11:1879-1888. [PMID: 30271194 PMCID: PMC6151104 DOI: 10.2147/jpr.s144633] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Background The use of radiofrequency ablation (RFA) procedures to treat chronic knee pain has surged in the past decade, though many questions remain regarding anatomical targets, selection criteria, and evidence for effectiveness. Methods A comprehensive literature review was performed on anatomy, selection criteria, technical parameters, results of clinical studies, and complications. Databases searched included MEDLINE and Google Scholar, with all types of clinical and preclinical studies considered. Results We identified nine relevant clinical trials, which included 592 patients, evaluating knee RFA for osteoarthritis and persistent postsurgical pain. These included one randomized, placebo-controlled trial, one randomized controlled trial evaluating RFA as add-on therapy, four comparative-effectiveness studies, two randomized trials comparing different techniques and treatment paradigms, and one non-randomized, controlled trial. The results of these studies demonstrate significant benefit for both reduction and functional improvement lasting between 3 and 12 months, with questionable utility for prognostic blocks. There was considerable variation in the described neuroanatomy, neural targets, radiofrequency technique, and selection criteria. Conclusion RFA of the knee appears to be a viable and effective treatment option, providing significant benefit to well-selected patients lasting at least 3 months. More research is needed to better identify neural targets, refine selection criteria to include the use of prognostic blocks, optimize treatment parameters, and better elucidate relative effectiveness compared to other treatments.
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Affiliation(s)
- David E Jamison
- Department of Anesthesiology, Walter Reed National Military Medical Center (WRNMMC), Bethesda, MD, USA, .,Department of Anesthesiology, Uniformed Services University of Health Sciences (USUHS), Bethesda, MD, USA,
| | - Steven P Cohen
- Department of Anesthesiology, Walter Reed National Military Medical Center (WRNMMC), Bethesda, MD, USA, .,Department of Anesthesiology, Uniformed Services University of Health Sciences (USUHS), Bethesda, MD, USA, .,Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA, .,Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD, USA, .,Department of Physical Medicine and Rehabilitation, Johns Hopkins School of Medicine, Baltimore, MD, USA, .,Department of Physical Medicine and Rehabilitation, USUHS, Bethesda, MD, USA,
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8
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Ahmed A, Arora D. Ultrasound-Guided Neurolysis of Six Genicular Nerves for Intractable Pain from Knee Osteoarthritis: A Case Series. Pain Pract 2018; 19:16-26. [PMID: 29761638 DOI: 10.1111/papr.12710] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 04/04/2018] [Accepted: 05/03/2018] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Among the elderly population, chronic osteoarthritis of the knee joint is one of the leading causes of disability and causes considerable pain, joint stiffness, and functional limitations. Although knee replacement is a good option for advanced osteoarthritis, many patients could not undergo surgery due to comorbidities or other reasons. METHODS Four patients with severe pain from grade 3 and 4 osteoarthritis of the knee had undergone ultrasound-guided alcohol neurolysis of the 6 genicular nerves after a positive genicular nerve block with local anesthetics. The demographics, pain intensity (NRS), Oxford Knee Score (OKS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and quality of life (SF-36) were analyzed. RESULTS There was significant improvement in pain intensity at rest, on movement, and on weight bearing after the neurolysis and it has continued for 6 months (P < 0.05). The OKS and WOMAC score had improved from 7.75 ± 1.25 and 77.75 ± 4.34 at baseline, to 20.75 ± 1.70 and 56.25 ± 3.09 at 1 month, and to 18.25 ± 0.95 and 52.00 ± 2.16 at 6 months after the procedure, respectively (P < 0.05). There was also significant improvement in the quality of life after the procedure (P < 0.05). CONCLUSION Ultrasound-guided alcohol neurolysis is a good alternative for patients having severe pain from knee osteoarthritis and provides significant pain relief for more than 6 months.
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Affiliation(s)
- Arif Ahmed
- Asian Institute of Medical Sciences, Faridabad, Haryana, India
| | - Divesh Arora
- Asian Institute of Medical Sciences, Faridabad, Haryana, India
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Mata J, Valentí P, Hernández B, Mir B, Aguilar JL. Study protocol for a randomised controlled trial of ultrasound-guided pulsed radiofrequency of the genicular nerves in the treatment of patients with osteoarthritis knee pain. BMJ Open 2017; 7:e016377. [PMID: 29102985 PMCID: PMC5722097 DOI: 10.1136/bmjopen-2017-016377] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
INTRODUCTION The goals for the management of patients with osteoarthritis (OA) of the knee are to control pain and to minimise disability. Because the number of patients will increase as the population ages, alternative approaches to alleviate their joint pain other than conventional treatments are necessary. The purpose of this article is to present a refined protocol to determine if there is long-term improvement in pain and function after ultrasound-guided pulsed radiofrequency treatment of the genicular nerves (GNs) in patients with chronic painful knee OA. METHODS AND ANALYSIS This study is a randomised, double-blind, placebo-controlled, parallel design trial. One hundred and forty-two outpatients with OA of the knee will be recruited from Mallorca, Spain. Participants will be randomly allocated into two groups: ultrasound-guided sham GN pulsed radiofrequency without active treatment and ultrasound-guided real GN pulsed radiofrequency. The primary outcome measures will be the observed changes from baseline pain intensity based on visual analogue scale (VAS). The possible changes in the secondary efficacy variables from the baseline as assessed by the Goldberg Anxiety and Depression Scale, pain medication use, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC subscales) and VAS pain intensity are also to be included in the study. These variables will be assessed at baseline, 1 month, 3 months, 6 months and 1 year after treatment. ETHICS AND DISSEMINATION The protocol was approved by the Research Ethic Committee of the Balearic Islands (IB 3223/16 PI). The results will be disseminated in peer-reviewed journals and at scientific conferences. TRIAL REGISTRATION Trial registration numberNCT02915120; Pre-results.
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Affiliation(s)
- Javier Mata
- Department of Anaesthesia, Son Llàtzer University Hospital, Palma de Mallorca, Spain
| | - Pedro Valentí
- Department of Anaesthesia, Son Llàtzer University Hospital, Palma de Mallorca, Spain
| | - Beatriz Hernández
- Department of Anaesthesia, Son Llàtzer University Hospital, Palma de Mallorca, Spain
| | - Bartolome Mir
- Department of Anaesthesia, Son Llàtzer University Hospital, Palma de Mallorca, Spain
| | - Jose Luis Aguilar
- Department of Anaesthesia, Son Llàtzer University Hospital, Palma de Mallorca, Spain
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