Knee Osteoarthritis Clinical Trial
Official title:
Comparison of Conventional and Cooled Radiofrequency Treatment of the Genicular Nerves Versus Sham Procedure for Patients With Chronic Knee Pain: a Multicentre, Double Blind, Randomised Controlled Trial
Chronic knee pain remains a disabling disease despite current treatment strategies. There is an increase in the prevalence of osteoarthritis (OA) of the knee in the general population, presently affecting approximately 450,000 individuals in Belgium. A total knee replacement is a viable alternative for severe knee OA that does not respond to conservative therapy. Unfortunately, up to 53% of patients who undergo a total knee replacement develop persistent post-surgical pain (PPSP). There is currently no effective therapy for PPSP. A radiofrequency (RF) treatment applies high frequency current on the nerve responsible for pain conduction, resulting in an interruption of the transmission of pain. This can be applied to the nerves innervating the knee joint - the superolateral, superomedial and inferomedial genicular nerves - and could be an alternative, minimally invasive treatment for patients with knee OA who fail conservative treatments and for patients with PPSP. Data from the recent literature indicates that this treatment leads to a reduction of pain intensity and could result in an improvement of knee function, of the psychological state of the individual, and finally in an increase in health-related quality of life. Furthermore, RF of the genicular nerves could help avoid or delay a total knee replacement therefore potentially contributing to cost reduction. Both cooled and conventional RF treatments are reported in the literature to improve pain. The use of water to cool the RF electrodes results in an increased lesion size by removing heat from adjacent tissue, allowing power delivery to be increased. As a consequence, cooled RF could result in a higher chance of success and longer duration of effect. Until now, the studies performed on cooled RF are industry initiated and a direct comparison between conventional, cooled and a sham procedure is lacking. The aim of the COGENIUS trial is to investigate the effect of the two types of RF treatment on individuals experiencing chronic knee pain that is resistant to conservative treatments. For this purpose, the efficacy and cost-effectiveness of cooled and conventional RF will be compared to a sham procedure in patients suffering from knee OA and PPSP after total knee replacement.
In this three-arm, pragmatic, prospective, multicentre, double blind, randomised sham-controlled trial of approximately 4 years duration, 400 patients with chronic moderate to severe anterior knee pain (>12 months) refractory to conventional treatments will be included. Two groups of chronic knee pain patients will be enrolled depending on the aetiology of knee pain: OA and PPSP. Each patient will undergo a run-in period of 1 to 3 months depending on the previous treatments of the patient. A run-in period is added to the trial to guarantee that conservative treatment is performed in an optimal way before randomisation. In each group (osteoarthritis and persistent post-surgical pain), non-responders to the run-in period will be randomly allocated to a conventional RF intervention of the genicular nerves, a cooled RF intervention of the genicular nerves or a sham procedure in a 2:2:1 ratio. The patients will be followed up for a period of 2 years. ;
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