Facet arthropathy is a form of osteoarthritis that affects the small joints running along the back of your spine. These joints, called facet joints, connect each vertebra to the one above and below it, and when their protective cartilage breaks down over time, the result is pain, stiffness, and reduced mobility. It’s a common finding: facet joint involvement accounts for roughly 15% to 45% of chronic low back pain cases, and nearly 10% of adults already show signs of degeneration by age 30.
What Facet Joints Do
Your spine isn’t one solid column. It’s made up of individual vertebrae stacked on top of each other, and between each pair of vertebrae sit three joints: a disc in the front and two facet joints in the back. The facet joints are the only synovial joints in the spine, meaning they’re lined with a slippery membrane and encased in a fibrous capsule, much like a knee or a knuckle. Their job is to guide and limit motion. In your mid-back, the facet joints are oriented to allow rotation while limiting how far you can arch backward. In your lower back, the orientation flips to restrict twisting while permitting bending forward and back.
Together with the discs and a set of strong ligaments, facet joints form the spine’s functional unit. They bear a significant share of the load whenever you stand, twist, or bend. That constant use is part of why they’re so vulnerable to wear over a lifetime.
How the Joint Breaks Down
Facet arthropathy follows a predictable pattern. It starts with the gradual wearing away of the smooth cartilage that covers the joint surfaces. As that cartilage thins, the joint space narrows, and small erosions develop on the exposed bone. The bone underneath responds by hardening, a process called sclerosis, and bony spurs (osteophytes) begin to grow at the edges of the joint where the cartilage once ended.
Over time, the joint capsule itself thickens and becomes overgrown with tough fibrous tissue. In some cases, fluid-filled pouches called synovial cysts form along the back of the joint. These cysts can press on nearby nerves and create symptoms that mimic a herniated disc. The entire process is progressive, though the speed varies widely from person to person.
What Facet Arthropathy Feels Like
The hallmark symptom is a deep, aching pain on one or both sides of the spine, localized to the level of the affected joint. In the lower back, this pain often radiates into the buttock or the back of the thigh, stopping above the knee. It can feel similar to sciatica, but it rarely travels all the way down to the foot. In the neck, facet pain tends to spread into the shoulder, the base of the skull, or between the shoulder blades.
The pain typically worsens with movements that compress the joints: arching your back, twisting, or standing for long periods. Sitting may offer some relief because it opens the facet joints slightly. Morning stiffness that improves with gentle movement is common. Flare-ups often follow periods of heavy activity or prolonged awkward positions, and they can range from a mild ache to sharp, catching pain that makes it hard to straighten up.
Who Gets It and Why
Age is the strongest predictor. Facet joints accumulate wear just like hips and knees, and imaging studies frequently show degenerative changes in people over 50 who have no symptoms at all. But age isn’t the only factor. Disc degeneration often accelerates facet breakdown because when a disc loses height, more of the spine’s load shifts onto the facet joints behind it. Repetitive heavy lifting, prolonged standing, jobs that involve frequent twisting, excess body weight, and previous spinal injuries all add mechanical stress that speeds the process. Genetics also play a role in how quickly cartilage deteriorates.
How It’s Diagnosed
Facet arthropathy often shows up incidentally on imaging ordered for back pain. X-rays can reveal joint space narrowing, bone spurs, and hardening of the bone surfaces. CT scans provide more detail, and MRI can show early cartilage changes, joint swelling, and cysts that plain X-rays miss. But here’s the catch: imaging findings don’t always match symptoms. Many people with significant joint degeneration on a scan have no pain, and some people with severe facet pain have relatively normal-looking imaging.
Because of this disconnect, the accepted reference standard for confirming that a facet joint is actually the source of pain is a diagnostic nerve block. A small amount of numbing medication is injected near the tiny nerve (medial branch) that carries pain signals from the facet joint. If the injection eliminates at least 80% of the pain, it’s strong evidence that the facet joint is the problem. False-positive rates with a single injection can be as high as 45%, so most guidelines recommend confirming the result with a second injection on a separate day before pursuing further treatment.
Managing Pain Without Procedures
For most people, the first line of treatment is a combination of anti-inflammatory medication and targeted exercise. Over-the-counter anti-inflammatories are effective for most patients during flare-ups and can be supplemented with short courses of stronger options when needed. The goal of medication is to break the cycle of pain and muscle guarding so that you can move and exercise more comfortably.
Exercise is the most important long-term strategy. The guiding principle is simple: movement lubricates the joints and strengthens the muscles that support them, reducing the load on the facet joints themselves. Physical therapy for facet arthropathy focuses on a few key areas:
- Core stabilization. Strengthening the deep abdominal muscles takes pressure off the facet joints by improving how your spine handles load.
- Flexibility work. Tight hip flexors and hamstrings pull on the pelvis and increase the curve in your lower back, which compresses the facet joints. Stretching these muscle groups can reduce that stress significantly.
- Controlled spinal mobility. Gentle rotation exercises, like lying on your back and slowly rocking your bent knees from side to side, help maintain joint motion and relieve muscle tension. Pulling one or both knees to your chest while lying flat opens the facet joints and stretches the surrounding tissues.
These exercises work best when done consistently. A physical therapist at Hospital for Special Surgery recommends performing mobility exercises two to three times daily and stretches once daily, holding each stretch for 20 to 30 seconds. The key is regularity, not intensity.
Interventional Procedures
When conservative treatment isn’t enough, the next step is usually a procedure that targets the nerve carrying pain signals from the joint. After a successful diagnostic nerve block confirms the facet joint as the pain source, radiofrequency ablation (also called radiofrequency denervation) uses heat to disable that nerve. A needle-sized probe is placed near the nerve under imaging guidance, and a controlled burst of heat interrupts the nerve’s ability to transmit pain.
Short-term results are encouraging: about 76% of patients experience at least 50% pain reduction in the weeks following the procedure. However, relief diminishes over time. At six months, the success rate drops to roughly 32%, and at one year, about 22% of patients still maintain that level of improvement. The median duration of meaningful relief is around 17 weeks. Only about 10% of patients in prospective studies achieve complete pain relief lasting a full year. The nerve eventually regenerates, which is why the procedure sometimes needs to be repeated.
Steroid injections directly into the facet joint or near the medial branch nerve are another option. They can provide temporary relief during flare-ups, though their long-term benefit for facet arthropathy is modest.
When Surgery Becomes an Option
Surgery for facet arthropathy alone is uncommon. No established guidelines support spinal fusion as a treatment for patients whose pain doesn’t respond to injections and nerve procedures. Surgery is generally reserved for cases where facet degeneration has led to a specific structural problem, most often spondylolisthesis, a condition where one vertebra slips forward on the one below it. Even in those cases, fusion is considered a last resort and may not lead to significant pain reduction. The vast majority of people with facet arthropathy manage their symptoms effectively with a combination of exercise, medication, and periodic procedures when needed.