Summary: Pulsed radiofrequency is a minimally invasive neuromodulation technique. It uses low-temperature electromagnetic waves to . It is a safe and repeatable option for managing chronic pain.
Radiofrequency Ablation vs Minimally Invasive Pulsed Radiofrequency
Radiofrequency ablation (RFA) is a traditional and commonly used interventional pain treatment. It primarily uses high temperatures to destroy the conduction function of sensory nerves, thereby blocking pain signals to achieve pain relief. This technique is frequently used for joint pain, such as in the knees, hips, sacroiliac joints, and lumbar facet joints. However, because this high-temperature treatment destroys the nerve fibres, it is only suitable for purely sensory nerves, which limits its range of applications.
The Breakthrough and Principles of Pulsed Radiofrequency
In recent decades, the medical community has developed a technique called “pulsed radiofrequency” (PRF). Although the equipment is similar to traditional RFA, the pain-relieving mechanism is completely different. Pulsed radiofrequency delivers intermittent electromagnetic waves, allowing the tissue enough time to dissipate heat and keeping the needle tip temperature at or below 42°C. This gentle temperature does not destroy the nerve fibres. Therefore, it can be safely applied to “mixed nerves” that contain both sensory and motor functions, vastly expanding its treatment applications.
A Pain Relief Mechanism Independent of Heat
Unlike the high-temperature destruction seen in traditional radiofrequency, pulsed radiofrequency relieves pain primarily through neuromodulation (adjusting how nerves process signals). Its mechanisms include reducing the nerve’s sensitivity to pain transmission, activating the central nervous system’s built-in pain relief mechanisms, and regulating the nervous system to suppress inflammatory responses. This achieves a dual effect of reducing inflammation and relieving pain.
Wide Clinical Applications and Medical Evidence
Research shows that for cervical (neck) nerve pain or lumbar sciatica, pulsed radiofrequency can offer better pain control than local steroid injections. For instance, a double-blind, randomised controlled trial as early as 2007 confirmed its excellent efficacy in treating cervical radicular pain (nerve root pain in the neck). Furthermore, multiple clinical review studies support its effectiveness in controlling lumbar sciatica.
Beyond spinal nerve pain, pulsed radiofrequency is also effective for shingles pain (postherpetic neuralgia). Recent medical studies indicate that it can effectively reduce acute shingles pain, whilst improving patients’ sleep quality and alleviating the tension and anxiety caused by the pain.
Regarding headache treatment, double-blind studies have found that pulsed radiofrequency targeting the greater and lesser occipital nerves (nerves at the back of the head) can effectively relieve migraines and back-of-the-head pain. This result has also been confirmed by recent medical literature reviews.
Additionally, clinical case reports show that pulsed radiofrequency can effectively control chronic pelvic pain caused by gynaecological issues.
Some medical literature also indicates that this technique is suitable for treating joint pain caused by inflammation or degeneration in the temporomandibular joint (jaw joint) or lumbar facet joints.
The Treatment Process and Long-Term Advantages
During a pulsed radiofrequency treatment, a pain specialist will use ultrasound or X-ray imaging guidance to accurately place a specialised radiofrequency needle next to the target nerve, nerve ganglion, or inside a joint, before connecting it to the machine. The needle tip will then release powerful electromagnetic waves to exert its neuromodulatory and anti-inflammatory effects.
Clinical data shows that the pain relief from pulsed radiofrequency typically lasts for two to six months. Because it is a gentle, non-destructive, and minimally invasive treatment with a high safety profile, patients can safely undergo the procedure again if the pain returns. This provides a highly reliable option for people suffering from chronic pain.
Information provided by Dr Lee Yuk Ming, Sunny, Specialist in Pain Medicine
