What Is Facet Joint Syndrome, and Why Does the Pain Occur?
At every level of the spine, behind the vertebral body, there is a facet joint on the right and one on the left. These joints guide the spine's bending, twisting and backward-leaning movements and carry load. With age, repetitive strain and degeneration (osteoarthritis), the cartilage of these joints thins, the joint capsule stretches, and the small nerve branches that supply the joint (the medial branch) begin to carry pain signals. The result is movement-related pain, concentrated in the back or neck, sometimes with morning stiffness. The key point is this: facet-related pain and nerve-root pain from a disc herniation can often be confused; therefore, seeing facet osteoarthritis on MRI alone is not enough to make the diagnosis — many people have facet degeneration on imaging while the pain comes from elsewhere.
Diagnosis: Why Does the Facet Block Come First?
The most critical step in facet joint syndrome is confirming the diagnosis, because the treatment decision rests on it. Although examination and imaging may suggest a facet origin, a diagnostic facet block (medial branch block) is used for a definite distinction: under fluoroscopy, a local anaesthetic is delivered to the nerve branch of the joint thought to be responsible for the pain. If the patient experiences temporary but marked relief after this, it is very likely confirmed that the pain truly arises from that facet joint. This test is the most reliable way to prevent unnecessary RF procedures. If the diagnostic block produces no response, the source of the pain is most likely another structure (disc, sacroiliac joint, muscle), and applying RF directly would be wrong. Here too, the determinant of success is not the procedure but the correct diagnosis.
Radiofrequency (RF) Thermocoagulation — the Main Interventional Treatment
If the diagnostic block has confirmed facet-origin pain, radiofrequency (RF) thermocoagulation can be applied for a more lasting effect. In RF, controlled heat energy is delivered to the pain-transmitting medial branch nerve to reduce signal conduction; this is a closed, non-surgical intervention, usually performed under local anaesthesia. The honest expectation is this: RF does not 'repair' the facet joint and does not reverse the osteoarthritis; it only suppresses pain transmission. The effect may last from several months to a few years, but because the medial branch nerves can regenerate over time, the pain may recur, in which case the procedure can be repeated. In a correctly selected patient RF can reduce the need for medication and improve mobility, but no guarantee of a 'permanent definite cure' can be given to any patient. Facet block and RF can be a rational way to avoid major surgery such as spinal fusion — but only with the right diagnosis.
When Is Non-Surgical Enough, and When Is Surgery Considered?
Pure facet joint syndrome generally does not require surgery; the main approach is conservative treatment (exercise, posture adjustment, medication) and, when this is insufficient, interventional methods such as facet block / RF. However, if the facet problem is not isolated, the picture changes: if significant spinal canal stenosis, progressive nerve compression, instability (slippage of a vertebra — spondylolisthesis) or progressive loss of strength accompanies it, the problem is no longer facet pain alone and surgical evaluation may be needed. The honest frame is this: repeating RF indefinitely to mask an underlying structural problem is not right. The aim is neither unnecessary surgery nor leaving a truly surgical picture in limbo with interventional methods. The decision is made by evaluating the nature of the pain, imaging and neurological examination together.
Recovery, Expectations and Risks
The advantage of facet block and RF is a fast return to daily life compared with open surgery; most patients stand up shortly after the procedure. However, relief is not always immediate — the full effect of RF in particular may settle in over a few weeks. The realistic picture: in a correctly diagnosed patient, meaningful relief lasting months to years may be seen, but the effect may not be permanent and is repeated when needed. No intervention is without risk; in these needle-based procedures, possibilities such as infection, temporary numbness and pain at the site, although rare, exist and are discussed one by one during informed consent. No guarantee of a 'definite and permanent solution' can be given for any method. In the long term, weight control, strengthening the core (trunk) muscles and correct posture are necessary to reduce recurrence of facet pain, whatever method is applied.