Geniculate Artery Embolization for Knee Pain: A New Option for Osteoarthritis Relief

Traditional treatments for osteoarthritis usually follow a predictable pattern. You might start with over-the-counter medications or physical therapy. If symptoms continue, your treatment plan may include corticosteroid or hyaluronic acid injections. When those stop working, the conversation often shifts toward major surgery. However, there is a significant gap between temporary injections and a total knee replacement. For appropriately selected patients, geniculate artery embolization (GAE) may offer another nonsurgical option for managing knee osteoarthritis pain.

GAE is a minimally invasive procedure designed to target abnormal blood vessels associated with inflammation and pain in knee osteoarthritis, without opening or replacing the joint. It serves as a middle ground for those seeking arthritis pain relief who aren’t ready for the operating table.

If you are weighing this decision, our guide on how GAE may help delay knee replacement surgery walks through what that timeline can look like.

Understanding Knee Osteoarthritis and Chronic Pain

Knee osteoarthritis involves more than just the wear and tear of joint cartilage. Inflammation of the synovial lining and abnormal blood-vessel growth can contribute to pain in knee osteoarthritis, alongside structural changes within and around the joint.

In some patients, osteoarthritis is associated with synovial inflammation and increased abnormal blood-vessel growth, or neovascularization, around the affected joint. This increased vascularity is associated with inflammatory activity and changes in local pain signaling that may contribute to osteoarthritis symptoms. Common symptoms include:

•     Persistent knee pain that worsens after activity or at the end of the day.
•     Stiffness, especially in the morning or after prolonged sitting.
•     Swelling and warmth around the joint.
•     Limitations in movement that prevent you from enjoying your hobbies.

Many patients find themselves in a difficult spot when conservative care no longer provides results. When physical therapy, medications, or injections do not provide enough relief, persistent pain can continue to interfere with everyday movement and activity.

What Is Geniculate Artery Embolization (GAE)?

So, what is the GAE procedure for knee pain? Technically speaking, it is a minimally invasive, image-guided treatment. Instead of cutting into the knee joint, the doctor focuses on the blood supply surrounding it.

During the procedure, the physician targets the geniculate arteries, the small vessels that supply blood to the knee. By identifying areas of abnormal blood flow associated with inflammation, the doctor can introduce embolic material to partially block these specific vessels. This process reduces the excessive blood flow to the inflamed lining of the knee. Because it is performed through a tiny catheter, it is an outpatient visit, meaning you go home the same day.

How GAE Works to Reduce Knee Pain

The science behind how geniculate artery embolization works focuses on the link between blood flow and nerve irritation. In some osteoarthritic knees, synovial inflammation is associated with the growth of small abnormal blood vessels. These vessels may be accompanied by sensory nerve growth that contributes to pain signaling.

By using embolization to quiet this abnormal vascular activity, the goal is to:

•     Decrease the inflammatory signaling within the joint.
•     Reduce the hypersensitivity of the nerves around the knee.
•     Lower the overall volume of the pain signals sent to the brain.

It is important to note that GAE does not regrow cartilage or fix the physical structure of the bone. Instead, it acts as a highly targeted way to manage vascular and inflammatory processes that may contribute to osteoarthritis pain.

GAE vs. Cortisone Injections vs. Knee Replacement

Patients often ask how GAE compares to the two options they already know. The table below summarizes the main differences. Your specialist can help you decide which fits your stage of osteoarthritis.

GAE does not replace physical therapy or other appropriate components of osteoarthritis care. For some patients, reducing pain may make it easier to participate in exercise and rehabilitation. For a deeper look at avoiding the operating room, see our guide on knee osteoarthritis treatment without surgery.

Who Is a Candidate for GAE?

Determining who is a candidate for geniculate artery embolization requires a look at your medical history and the current state of your knee. GAE may be considered for selected patients with symptomatic knee osteoarthritis whose pain persists despite appropriate conservative treatment. Imaging findings, symptom severity, medical history, vascular health, and other factors help determine whether the procedure is appropriate.

You may be a good candidate if you experience any of the following:

•  Pain that remains despite regular physical therapy.
• A need for daily NSAIDs (like ibuprofen) that you would prefer to avoid.
• Inadequate relief from corticosteroid or gel injections.
• A desire to explore nonsurgical pain-management options or potentially delay knee replacement.

Certain conditions may make GAE inappropriate or require additional evaluation, including active or suspected knee infection and peripheral arterial disease. Kidney function and other medical factors may also need to be considered because contrast imaging is used during the procedure.

What to Expect During the Procedure

If you decide to move forward with GAE for chronic knee pain relief, the day of the procedure is relatively straightforward. After an initial evaluation and imaging, you will be brought to a specialized procedure suite.

You will receive local anesthesia at the access site, usually the groin or the wrist, and light sedation to keep you relaxed. The physician inserts a thin tube called a catheter into the artery and uses real-time X-ray imaging to navigate to the geniculate arteries. Once abnormal areas of blood flow associated with synovial inflammation are identified, the physician selectively delivers embolic material to the targeted vessels.

Recovery and Post-Procedure Experience

Because GAE is performed through a small catheter rather than an open surgical incision, recovery is generally shorter than recovery from knee replacement surgery.

• Same-Day Discharge: Most patients return home the same day.
• Immediate Post-Care: You may have a small bandage and mild bruising at the catheter insertion site.
•  Activity: Most people return to light daily activities within a few days.
• Results: While some feel a difference quickly, it typically takes a few weeks for the inflammation to subside and for the full pain-relieving effects to become noticeable.

Benefits of Geniculate Artery Embolization

For appropriately selected patients, GAE has several practical differences from surgical knee treatment:

• Typically No General Anesthesia: GAE is generally performed with local anesthesia and sedation rather than general anesthesia.
•  Outpatient Treatment: Patients can typically return home the same day after an appropriate monitoring period.
• Preservation of Anatomy: Nothing is removed or replaced, keeping your natural joint intact.
• Targeted Approach: GAE selectively treats abnormal vascularity associated with inflammation while leaving the knee joint structurally intact.

Risks and Safety Profile

Published studies to date suggest a generally favorable short-term safety profile, although GAE still carries procedural risks. However, as with any medical procedure, there are risks to discuss with your doctor. These may include minor bleeding or bruising at the site where the catheter was inserted. Temporary skin discoloration over the knee and small access-site bruising are among the more commonly reported effects in published studies. In very rare cases, the particles could move to an unintended area.

Limitations and Considerations

GAE is an evolving application of embolization therapy. In the United States, embolic agents used for GAE do not currently have a specific FDA indication for treating knee osteoarthritis, so their use for this purpose is considered off-label. Your physician can explain what that means and discuss the available evidence, potential benefits, and risks as part of the informed-consent process.

Clinical Outcomes and What the Research Shows

Published research on GAE is growing but still maturing. In open-label studies, patients have reported meaningful reductions in knee pain, with one pooled analysis describing an average pain reduction of roughly 30 points on a 100-point scale at 6 to 12 months, alongside improved function scores. A 2020 study by Bagla and colleagues and a 2022 multicenter randomized study reported early pain improvement after GAE. At the same time, some sham-controlled trials have not shown a statistically significant difference between GAE and a placebo procedure, and longer-term data is still being collected. For the right candidate, current evidence suggests GAE can be a reasonable option to consider, and a specialist can explain what the research means for your specific situation.

Selected peer-reviewed references:

• Okuno Y, Korchi AM, Shinjo T, et al. Midterm clinical outcomes and MR imaging changes after transcatheter arterial embolization for mild to moderate radiographic knee osteoarthritis. J Vasc Interv Radiol. 2017;28(7):995-1002.
• Bagla S, Piechowiak R, Hartman T, et al. Genicular artery embolization for the treatment of knee pain secondary to osteoarthritis. J Vasc Interv Radiol. 2020;31(7):1096-1102.
•  Bagla S, Piechowiak R, Sajan A, et al. Multicenter randomized sham controlled study of genicular artery embolization for knee pain secondary to osteoarthritis. J Vasc Interv Radiol. 2022;33(1):2-10.e2.
•  Little MW, Gibson M, Briggs J, et al. Genicular artery embolization in patients with osteoarthritis of the knee (GENESIS) using permanent microspheres: interim analysis. Cardiovasc Intervent Radiol. 2021;44(6):931-940.
• Padia SA, Genshaft S, Blumstein G, et al. Genicular artery embolization for the treatment of symptomatic knee osteoarthritis. JBJS Open Access. 2021;6(4):e21.00085.

Why Choose Dr. Moshfegh for GAE in Los Angeles

At the Southern California Vascular Institute, patients considering genicular artery embolization are cared for by Dr. Amiel Moshfegh, a vascular and interventional radiologist who focuses on minimally invasive, image-guided treatments for chronic pain and vascular conditions. He is board certified in Diagnostic Radiology by the American Board of Radiology and holds a Certificate of Added Qualification in Vascular and Interventional Radiology. He completed his fellowship training at NewYork-Presbyterian Hospital (Weill Cornell) and Memorial Sloan Kettering Cancer Center, and he personally performs GAE at the practice.

His approach centers on careful candidate selection, a clear explanation of what the current evidence does and does not show, and a treatment plan built around your goals.

Patients across Los Angeles, Huntington Park, and Bakersfield can schedule a consultation to find out whether GAE is appropriate for them.

Integrating GAE Into a Long-Term Knee Care Plan

GAE may be one component of a broader osteoarthritis management plan. Depending on your needs, that plan may also include weight management, appropriate exercise, physical therapy, medications, and ongoing follow-up. If GAE reduces pain, some patients may find it easier to remain active and participate in rehabilitation.

Ready to find out if GAE is right for you? Schedule a consultation with the Southern California Vascular Institute to review your knee and your options. Call 323-488-0039 or request an appointment online.

Conclusion

Geniculate artery embolization is an emerging minimally invasive option for selected patients with symptomatic knee osteoarthritis. It targets abnormal vascularity associated with inflammation without replacing or surgically opening the knee joint. While research continues to define its long-term effectiveness and ideal candidates, GAE may be worth discussing when appropriate conservative treatments have not provided adequate relief.

If knee pain continues to interfere with daily activity, a consultation with Southern California Vascular Institute can help determine whether GAE or another treatment approach may be appropriate.

Frequently Asked Questions