By Jospeh McBride, interventional and diagnostic radiologist
Geniculate artery embolization (GAE) is a minimally invasive, image-guided procedure that reduces chronic knee pain – most commonly from osteoarthritis – by decreasing abnormal blood flow to inflamed synovial tissue. Rather than removing tissue or replacing the joint, GAE targets synovitis, a major source of pain.
GAE is an emerging, well-studied option, supported by multiple prospective studies and growing real-world experience. It is also effective for recurrent hemarthrosis, especially after knee arthroplasty or cartilage procedures.
How the procedure works
In osteoarthritis and chronic knee conditions, the synovium becomes thickened, inflamed, and hypervascular. This increased blood flow perpetuates pain. GAE reduces this inflammation by selectively embolizing the small geniculate arteries feeding the synovium.
A small catheter is inserted through arterial access in the groin, wrist, or foot, depending on patient anatomy. Using fluoroscopy, a microcatheter is guided to the target geniculate branches, where microscopic embolic particles are injected to reduce blood flow while preserving normal tissue.
Patients receive light sedation, go home the same day, and typically resume normal activities within 24 to 48 hours.
Who are the best candidates?
GAE is well-suited for patients with knee pain unresponsive to conservative therapy:
- Moderate–severe osteoarthritis.
- Prior steroid, hyaluronic acid or PRP injections without lasting benefit.
- Incomplete relief from geniculate nerve blocks (RFA).
- Synovitis-driven pain after total knee arthroplasty.
- Recurrent postoperative hemarthrosis.
- Inability to tolerate NSAIDs.
- Patients wanting to delay or avoid arthroplasty.
Patients often respond best when their pain location matches areas of hypervascular synovitis on imaging.
When to refer
Consider referral when any of the following apply:
- Knee pain lasting more than three to six months despite conservative management.
- Medial or lateral joint-line tenderness with OA on X-ray.
- Recurrent hemarthrosis after knee surgery.
- Failure of one or two intra-articular injections.
- Pain limiting activity when the patient is not ready or not a candidate for TKA.
- Weight-bearing knee X-rays are sufficient unless symptoms are atypical.
Benefits for patients
Most patients experience improvement within two to six weeks, with durable benefit reported in studies.
- 50% to 70% reduction in pain scores (VAS).
- 40% to 60% improvement in function (WOMAC).
- Rapid recovery within 24 to 48 hours.
- Very low complication rate.
- Effective for synovitis and postoperative hemarthrosis.
- May delay or reduce the need for arthroplasty.
- Hemarthrosis studies show 80% to 95% reduction or resolution of bleeding episodes.
Risks
Low overall risk. Reported complications include:
- Temporary skin discoloration or superficial ulceration.
- Mild post-embolization soreness.
- Access-site hematoma.
- Rare non-target embolization
Coverage and referral process
Coverage continues to expand as more data emerge. Our office works directly with insurers and provides transparent cost information to patients.
- To refer, contact Interventional Radiology:
- Phone: 402.559.8574
- Fax: 402.559.3050
- Please include clinic notes and recent knee X-rays if available.