Inclusion Criteria:  A. All candidate subjects  Subject must provide written informed consent prior to any clinical investigation-related procedure Subject is ≥ 18 years of age Subject has chronic pain > 6 months and was unresponsive to conservative management Subject has pain on an NRS scale of ≥ 6 Subject is scheduled for an RFA procedure with the IonicRF generator within 30 days of baseline Subject has stable chronic pain medication use for 30 days Subject is willing and able to comply with the prescribed follow-up evaluations  B. Candidate subjects with facet joint pain (lumbar or cervical)  Subject has unilateral or bilateral pain on para-spinal palpation Subject has facet joint pain confirmed by at least 1 positive medial branch block with 0.5 mL or less of anesthetics achieving at least 50% pain relief, with real-time injection of radiographic contrast under fluoroscopic guidance  C. Candidate subjects with sacroiliac joint pain  1. Subject has sacroiliac joint pain confirmed by an infiltration (with bony contact on 3 vertebral levels) of local anesthetics in the posterior part of the sacroiliac joint achieving at least 50% pain relief  D. Candidate subjects with radicular pain  1. Subject has radicular pain confirmed by sensory mapping across at least 1 vertebral level  E. Candidate subjects with trigeminal neuralgia  Subject has trigeminal pain elicited using a provocation test (e.g. contact with toothbrush) Subject has sudden, non-continuous pain Subject did not have any mass effect or stroke causing trigeminal pain confirmed by MRI Subject has attempted anti-neuropathic medication with no improvement of symptoms  F. Candidate subjects with knee or hip pain  Subject has radiographically confirmed osteoarthritis of the hip or knee, or has chronic pain following joint arthroplasty Subject has knee or hip pain confirmed by sensory mapping and/or diagnostic block(s)  Exclusion Criteria:  A. All candidate subjects  Subject is currently participating in another clinical investigation that may confound the results of this study. Ongoing systemic or local infection in the area of the procedure. Recent use of anticoagulants or subject with coagulopathy. Primary complaint of deafferentation pain. Presence of other anatomic or comorbid conditions, or other medical, social, or psychological conditions that, in the investigator's opinion, could limit the subject's ability to participate in the clinical investigation or to comply with follow-up requirements of the clinical investigation results. Subject's opioid usage is > 90 morphine equivalents per day.  B. Candidate subjects with trigeminal neuralgia  1. Subject has sensory problems