Chronic Knee Pain After Surgery? A Minimally Invasive Alternative You Haven’t Heard Of

You did everything right. You had the surgery your orthopedic surgeon recommended — whether that was a total knee replacement, an ACL reconstruction, or a meniscus repair. You showed up to every physical therapy appointment, pushed through the discomfort, and followed your recovery plan to the letter. So why, months or even years later, does your knee still hurt?

Why Some Patients Still Hurt After Knee Surgery

Knee surgery addresses a specific structural problem. A torn ACL gets reconstructed. Damaged cartilage gets trimmed or repaired. A worn-out joint gets replaced with hardware. These procedures are well-established, and for many patients they work exactly as planned.

But surgical success does not always equal a pain-free life. Studies suggest that roughly 20 percent of patients who undergo total knee replacement continue to experience significant pain afterward — in the best-quality prospective studies, an unfavourable long-term pain outcome was reported in about one patient in five.¹ For patients who have had arthroscopic procedures like meniscus surgery or ACL repair, the numbers can look similar.

There are many possible reasons. Scar tissue can form around the joint. Nerve irritation from the surgery itself can linger. In some cases, the original source of damage was addressed, but chronic inflammation in the surrounding tissue never fully resolved. Physical therapy can do tremendous work in rebuilding strength, restoring range of motion, and calming some of that inflammation — and it remains one of the most important pieces of any recovery plan. Still, there are patients who plateau. They finish their PT course, they do their home exercises, and they hit a wall where the pain simply will not budge.

That plateau is the point where many patients start wondering what else is out there. And increasingly, the answer involves a closer look at the blood supply around the knee.

The Role of Inflammatory Blood Vessels in Chronic Knee Pain

Here is something that might surprise you. In many cases of chronic knee pain — whether it developed after surgery or alongside conditions like osteoarthritis — the pain is being sustained by tiny, abnormal blood vessels that have grown around the joint. Doctors call this process neovascularity.

Think of it this way. When your body senses damage or ongoing stress in a joint, it sends extra blood flow to the area as part of the healing response. That is a normal and helpful process in the short term. But sometimes, especially when inflammation has been present for a long time, the body overshoots. It grows a dense network of fragile new blood vessels in the tissue around the knee, and along with those vessels come new nerve fibers that transmit pain signals.

The result is a self-reinforcing cycle. The abnormal vessels feed ongoing inflammation, the inflammation triggers more pain, and the pain keeps the whole loop running. Traditional treatments like anti-inflammatory medications, cortisone injections, and even additional surgery may not break this cycle because they are not specifically targeting those vessels.

This is exactly where genicular artery embolization — commonly called GAE — enters the picture.

What Is Genicular Artery Embolization?

GAE is an image-guided, outpatient procedure performed by a vascular or interventional specialist. Dr. David Fox, MD, FACS, RPVI, a board-certified vascular surgeon at Fox Vein & Vascular in Manhattan, is among the physicians offering this procedure to patients with chronic knee pain who have not found adequate relief through other treatments.

During the procedure, Dr. Fox makes a tiny puncture — typically at the wrist or groin — and guides a thin catheter through the blood vessels to the arteries supplying the knee. Using real-time fluoroscopy (a type of live X-ray imaging), he identifies the clusters of abnormal inflammatory vessels that have formed around the joint. Once located, he delivers microscopic particles through the catheter that gently block blood flow to those specific vessels.

The entire procedure typically takes between 45 and 90 minutes. There is no general anesthesia involved — only local anesthesia with light sedation if you prefer. Because there is no incision and no hardware, the recovery is remarkably straightforward:

• Same-day discharge. You go home the day of the procedure.
• Walking immediately. Most patients are on their feet and moving within hours.
• Light activity within days. Many patients return to daily routines quickly, though Dr. Fox provides individual guidance based on your situation.
• Gradual pain improvement. Relief typically builds over a period of weeks, with significant improvement often noticed within one to three months.

If you would like a deeper look at how the procedure works and who it is designed for, you can read more about genicular artery embolization as a treatment for chronic knee pain on the Fox Vein & Vascular website.

What the Research Says

GAE is not a brand-new concept pulled out of thin air. The underlying technique — targeted embolization of abnormal blood vessels — has been used safely in medicine for decades, including in the treatment of uterine fibroids and certain vascular malformations. Its application to knee pain specifically has been studied in clinical trials over the past several years, with encouraging results.

The uncontrolled studies are encouraging. A 2026 systematic review pooling 18 studies and 534 patients found pain scores falling by roughly four points on a ten-point scale and staying down at twelve months — a larger change than the threshold usually treated as clinically meaningful — with function and quality of life improving alongside.² Those studies had no comparison group, though, so they cannot separate the effect of the procedure from the effect of having had a procedure, which for pain is not a small thing.

Three sham-controlled trials have now tested exactly that, and they do not agree. The first reported a benefit. The two most recent found no significant difference between embolization and a sham procedure.³ The same meta-analysis that found the large pooled effect says in its own conclusion that the sham-controlled data leave the magnitude of the treatment effect uncertain,² and the supportive reviews published before those two trials did not include them. A 2025 perspective in Osteoarthritis Imaging puts it more bluntly, arguing that the growing clinical use of GAE has run ahead of the evidence for it.³

None of that makes GAE a bad option to ask about. It does mean the honest summary is a promising procedure still being tested rather than an established one, and that the difference matters most to the person deciding whether to have it. If it is offered to you, it is a fair question to ask how the sham-controlled results are being weighed, and what the plan is if the pain does not change.

It is also worth noting that GAE is not just for post-surgical knee pain. Patients with knee osteoarthritis who are trying to avoid or delay a knee replacement may also be strong candidates. If you have been told that knee replacement is your next step and you are not ready for that level of surgery, GAE is one of the things worth asking about — it is done through a pinhole puncture rather than an operation, and recovery is measured in days. Whether it will reduce your pain is the part the trials disagree about, so weigh it as something to try rather than something to count on.

A Collaborative Approach — Not a Competing One

One thing that matters deeply to Dr. Fox is working as part of a team, not in a silo. If you are reading this article on DrSensory, chances are you are either currently in physical therapy, recently completed a course of rehab, or are considering it. That context is important, and Dr. Fox respects it.

GAE does not replace physical therapy. It does not replace the relationship you have with your orthopedic surgeon or your primary care physician. What it does is provide another tool — a targeted, minimally invasive tool — that can address a specific source of pain that other treatments may not be reaching. In many cases, patients who undergo GAE find that they are actually able to participate more fully in PT afterward because the inflammatory pain that was holding them back has been reduced.

Dr. Fox routinely collaborates with orthopedic surgeons and physical therapists, both before and after the procedure. The goal is always to fit GAE into your larger care plan in a way that makes sense for your body, your goals, and where you are in your recovery journey.

Finding Out If GAE Is Right for You

If you have been living with chronic knee pain after surgery — or if osteoarthritis has you weighing options you are not thrilled about — it is worth having a conversation with a specialist who can evaluate whether GAE could help. Not every patient is a candidate, and an honest assessment of your imaging, your pain history, and your treatment timeline is the first step.

You can schedule a consultation with Dr. Fox and his team to discuss your situation. The appointment includes a review of your history and a candid conversation about whether GAE makes sense as part of your path forward. Because sometimes, the missing piece in your recovery is not more of what you have already tried — it is something different entirely.