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Knee Program · Step 5

Genicular artery embolization, explained honestly

GAE is one of the most-searched knee procedures in the country and one of the least well explained. Here is what it is, who performs it, what the evidence says in September 2026 — and why we will refer you rather than sell it to you.

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Innovare Tx does not perform genicular artery embolization. It is performed by an interventional radiologist. We evaluate, explain and refer. This page exists because patients ask about GAE constantly and deserve a straight answer.

In short
Genicular artery embolization (GAE) is an interventional radiology procedure in which a fine catheter is used to reduce abnormal blood flow to the inflamed lining of an arthritic knee. It is performed as an outpatient procedure under local anesthesia, typically taking one to two hours. It is investigational — not FDA-approved for knee osteoarthritis — and the Society of Interventional Radiology’s May 2026 position statement calls for larger randomized trials. We evaluate you for it and refer; we do not perform it.

What the procedure is

The knee is supplied by a set of small vessels called the genicular arteries. In some osteoarthritic knees, the inflamed synovial lining develops abnormal new vessels, and nerve fibers grow alongside them. The working idea behind GAE is that reducing blood flow through those abnormal vessels reduces the inflammation and the pain signaling associated with them.

Mechanically, it has nothing in common with a joint injection. Nothing is injected into the knee joint. An interventional radiologist works from inside the arterial system, using imaging to steer a catheter into the specific vessels feeding the abnormal area.

How it is performed

Published technique descriptions are consistent on the outline. The procedure is done on an outpatient basis under local anesthesia and usually takes one to two hours. Access is most often through the femoral artery at the groin, with radial access at the wrist used depending on the operator and the patient. A microcatheter is advanced superselectively into the genicular vessels, an angiogram identifies where the abnormal blush of new vessels is, and embolic material is delivered in small amounts — commonly permanent microspheres around 100 to 300 micrometres, or an ethiodized oil emulsion in some trial protocols — until the abnormal vessels are reduced and normal flow onward is preserved. Series generally report same-day discharge, walking the same day and a return to ordinary activity within a couple of days.

What the evidence says, as of September 2026

On 12 May 2026 the Society of Interventional Radiology published a position statement on GAE in the Journal of Vascular and Interventional Radiology. It describes GAE as an option for patients with symptomatic knee osteoarthritis who have not improved with conservative therapy and who are not candidates for, or wish to delay, total knee replacement, and characterizes it as a joint-preserving intervention targeting the inflammatory and neurovascular drivers of osteoarthritic pain.

The same statement is explicit that larger randomized controlled trials are needed to confirm the early clinical data and to inform care guidelines. That caveat matters. Most of the published outcome data comes from single-arm studies, and the sham-controlled randomized trials published so far have produced mixed results, with some pointing to a substantial nonspecific effect — which is exactly what a sham-controlled design exists to detect. Larger trials including GENESIS II (NCT05423587) and the phase 3 LipioJoint-2 trial (NCT06497140) are ongoing.

None of that makes GAE unreasonable to consider. It makes it a procedure you should go into with accurate expectations, which is a different thing from the way it is often marketed.

To be explicit about the one sentence people take away from that population description: Innovare Tx makes no claim that GAE prevents, avoids or delays a knee replacement. We are reporting how a published position statement defines the group it studied. What any individual procedure does for any individual knee is not something we or anyone else can promise you in advance.

Reported risks

Pooled safety analyses describe the most common event as transient skin discoloration over the knee, which resolves over several weeks, followed by bruising or hematoma at the puncture site. Reported rates differ widely between series, partly because studies define and look for these events differently. Transient soreness around the joint in the first day is also described. The more serious concern in the literature is over-embolization, which can cause skin injury and prolonged pain, and which is why technique papers emphasize using the smallest effective amount of embolic material.

Any real discussion of your own risk belongs with the interventional radiologist who would perform the procedure. We are not in a position to consent you for someone else’s procedure, and we will not pretend otherwise.

Where we fit

  • Evaluate your knee properly, including in-office ultrasound and a review of your imaging
  • Make sure the conservative plan has genuinely been tried, because that is the population GAE is described for
  • Explain what the published evidence does and does not show, without selling it
  • Coordinate the referral to an interventional radiologist and share our findings
  • Stay involved afterward — rehabilitation, primary care and the rest of the plan continue here

Notice the second item. The population described in the SIR statement is patients who have not improved with conservative therapy — which means the value of a structured knee physical therapy program is not only its own merit, but that having genuinely done it is part of what makes the conversation about anything else a real conversation.

GAE compared with what we do offer

They are not versions of each other. GAE works on the blood supply, from inside the arteries, performed by an interventional radiologist. The autologous orthobiologic procedures we offer are prepared from your own blood or bone marrow and delivered by image-guided injection in our clinic. Both are investigational for knee osteoarthritis. Neither is FDA-approved for it. Which, if either, is worth your time is a judgment made from your evaluation rather than from a comparison table.

Sources

  • Society of Interventional Radiology Position Statement on Genicular Artery Embolization for Symptomatic Knee Osteoarthritis, Journal of Vascular and Interventional Radiology, published 12 May 2026 — jvir.org
  • Outcome and Safety of Genicular Artery Embolization for Knee Osteoarthritis: a systematic review and meta-analysis, CardioVascular and Interventional Radiology — PubMed 42303879
  • Standardized angiographic workflow and technique for genicular artery embolization — PubMed 42065840
  • Trial registrations: GENESIS II NCT05423587, LipioJoint-2 NCT06497140

This page is general education, not medical advice, and it describes a procedure performed by other specialists. Verified against the sources above in September 2026.

Questions, answered

GAE FAQs

No. GAE is a catheter-based procedure performed by an interventional radiologist in an angiography suite with fluoroscopic imaging. It is not something a clinic like ours performs. Our role is to evaluate your knee, explain honestly what the current evidence shows, and coordinate a referral to an interventional radiologist if it is a reasonable thing for you to explore.
The genicular arteries are the small vessels supplying the tissue around the knee. In some arthritic knees, abnormal new vessels grow into the inflamed joint lining. GAE is a procedure in which an interventional radiologist passes a very fine catheter into those vessels and injects an embolic material to reduce that abnormal blood flow. It is an interventional radiology procedure, not a joint injection and not a surgery.
Published technique descriptions have it done as an outpatient procedure under local anesthesia, typically taking one to two hours. Access is usually through the femoral artery in the groin, with radial access at the wrist used in some cases. A microcatheter is advanced into the genicular arteries, and embolic material — commonly permanent microspheres in the 100 to 300 micrometre range, or an ethiodized oil emulsion in some trials — is injected in small amounts until abnormal vessels are reduced while normal flow is preserved. Most published series describe same-day discharge.
No. GAE for knee osteoarthritis is investigational. Studies have run under FDA investigational device exemptions, and no embolic device is FDA-approved specifically for this indication. Anyone offering it should tell you that plainly, along with what it costs, because insurance coverage is limited and inconsistent.
In May 2026 the Society of Interventional Radiology published a position statement in the Journal of Vascular and Interventional Radiology describing GAE as an option for patients with symptomatic knee osteoarthritis who have not improved with conservative therapy and who are not candidates for, or wish to delay, total knee replacement. The same statement calls for larger randomized controlled trials to confirm the early data. Published sham-controlled randomized trials have so far produced mixed results, with some suggesting a substantial nonspecific effect. Large trials including GENESIS II and LipioJoint-2 are ongoing.
In pooled safety data the most common event is transient skin discoloration over the knee, which resolves over a few weeks, followed by bruising or hematoma at the puncture site. Reported rates vary widely between studies. Less common but more serious problems relate to over-embolization, which can cause skin injury and prolonged pain. Any specific discussion of risk belongs with the interventional radiologist who would perform the procedure, not with us.
The procedure is aimed at knee pain driven by inflammation in a joint that still has some structure to work with. A knee with advanced deformity, mechanical instability, a locked joint, or a clear surgical problem is usually a surgical conversation instead. Vascular disease, bleeding disorders, contrast allergy and kidney function all affect suitability, and are assessed by the interventional radiologist. See who our program suits.

Start with an evaluation, not a procedure

Book at our Addison clinic, or call and we’ll tell you whether GAE is even the right conversation for your knee.

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