Intra-articular Pulsed Radiofrequency in Chronic Knee Pain

A 22-gauge 10 cm radiofrequency cannula with a 10-mm active tip was advanced to the mid-tibiofemoral joint under fluoroscopic guidance. After needle insertion, paresthesia-pain and motor stimulation tests were performed using sensory (50 Hz) and motor (2 Hz, 1 V) stimulation to confirm the absence of stimulation. Intra-articular Pulsed Radiofrequency (IAPRF) was applied at 45 V voltage for 20 ms pulse width for 360 s, followed by a 480 ms silent phase. The tissue temperature was adjusted to not exceed 42°C.

8 mg dexamethasone was applied into the tibio-femoral joint with a 22-gauge, 10 cm needle under fluoroscopy.