If your knee still hurts after replacement surgery, you may have come across genicular artery embolization, or GAE. It is a procedure that targets small blood vessels around the knee. Researchers have studied it mainly for knee osteoarthritis and are now investigating whether it can help selected people with persistent pain after knee replacement.
The distinction matters. Early studies after knee replacement are encouraging for some patients, but they are small. GAE is not a proven answer for every painful replaced knee, and an evaluation to find the cause of pain comes first.
What is genicular artery embolization?
The genicular arteries are blood vessels that supply areas around the knee. During GAE, an interventional radiologist guides a thin tube called a catheter through an artery, usually from the upper leg, toward selected vessels around the knee. Imaging helps the physician identify the vessels being treated. Small particles or another embolic material are then delivered to reduce blood flow in the targeted abnormal vessels. The exact material and technique can vary.
The proposed goal is to reduce abnormal blood vessel activity associated with inflammation and pain. GAE does not replace, reposition, or repair a knee implant. It is also different from a genicular nerve block or genicular nerve radiofrequency ablation, which target nerves rather than arteries.
Why study GAE after knee replacement?
Replacing the joint often improves pain substantially, but it does not remove every possible source of knee pain. Some people continue to have pain even after an evaluation finds no infection, loosening, or other clear mechanical problem.
Researchers are studying whether targeting abnormal vessels in the tissue around the knee can help some of these patients. That is a narrower question than whether GAE helps knee osteoarthritis before replacement. Results from osteoarthritis studies cannot simply be assumed to apply to a knee that already has an implant.
What does the research after knee replacement show?
Published studies suggest that some carefully selected patients report less pain after GAE, but the evidence is still developing.
In a retrospective study of 16 patients with persistent pain after total knee replacement, average pain scores improved after GAE. At six months, 10 of the 16 patients had at least a 50% reduction on the study’s pain scale. The authors reported no major complications in this small group. Without a comparison group, however, the study cannot tell us how much improvement was caused by GAE itself or how reliably another patient would benefit.
A separate 2026 pilot study included 15 patients with different types of knee arthroplasty, not exclusively total knee replacements. Pain scores improved initially, but benefit varied over time. Among the nine patients with 12-month results, five maintained at least a two-point improvement on a pain scale; three of the original 15 underwent a repeat embolization. This was also a small study without a comparison group.
The practical reading of these results is promising but uncertain. Larger, controlled studies are needed to establish which patients benefit, how long relief lasts, and how GAE compares with other care.
Who might be considered for an evaluation?
In the published post-replacement studies, researchers focused on people with persistent pain despite other treatment and assessed them for problems such as infection, implant loosening, malalignment, or mechanical failure before GAE.
An evaluation may be worth discussing if your pain continues to limit daily life and your orthopedic team has not found a clear cause that requires another treatment. Having pain after knee replacement does not, by itself, mean you are a candidate for GAE. Your surgeon and an appropriately qualified interventional radiologist would need to review your history, prior treatment, examination, and relevant tests.
What are the risks and limitations?
GAE involves access to an artery and delivery of material through a catheter. Reported side effects include temporary skin color changes, discomfort, and bruising or a collection of blood near the catheter entry site. Other complications are possible, and the risks depend on your health and the technique used. Studies of GAE for knee osteoarthritis have also reported less common skin injury and findings that need further study.
Small studies reporting no major complications after knee replacement cannot establish that major complications never occur. They also cannot yet give a dependable estimate of your chance of pain relief. Ask the treating physician about expected benefits, alternatives, possible complications, and follow-up for your situation.
What should you ask your doctor?
If you are interested in GAE, start with the cause of your pain. Useful questions include:
- Have infection and problems with the implant been evaluated?
- Is there a suspected source of pain that GAE is intended to address?
- What treatments have I already tried, and what other options fit my findings?
- What evidence applies specifically to people after knee replacement?
- What are the risks, costs, and realistic chances of improvement in my case?
Still hurting after knee replacement? Our 2-minute assessment can help you share your symptoms and find out whether further evaluation may be appropriate. The assessment cannot diagnose your pain or determine whether GAE is right for you.
