Blocking knee blood vessels eased pain for at least a year

Knee osteoarthritis wears down joint cartilage. Mayo Clinic says the disease also makes the body grow extra blood vessels around the knee. These vessels add inflammation and irritate nearby nerves, so moving hurts. A procedure called genicular artery embolization (GAE) temporarily blocks those vessels. It can reduce inflammation and quiet pain-sensing nerves without major surgery.

In a study of 194 patients, 80 percent reported much less knee pain, and the relief lasted at least a full year after the procedure. Patients also said walking, climbing stairs and bending felt easier. Quality-of-life scores more than doubled over the 12-month follow-up. Across 239 procedures, none caused severe complications. Only 6.7 percent reported mild side effects, such as brief skin discoloration or minor bruising, and these resolved on their own.

How the procedure works

During GAE, doctors use real-time X-ray guidance to steer a thin, flexible tube into the blood vessels around the knee. They then release tiny, dissolvable gelatin particles into specific vessels, which slows excess blood flow to the inflamed areas. The particles dissolve over time and leave no foreign material behind. No permanent implants are needed.

If the procedure is widely adopted, GAE could offer a repeatable, low-risk way for patients to stay active and preserve joint function longer, researchers say. The study has limits, though. It had no control group, so it is hard to separate the particles' effect from a placebo response. It followed patients for only one year, and more research is needed to learn how long the relief lasts and how often treatment may be repeated. The procedure is not a cure. It does not rebuild lost cartilage or reverse structural joint damage. Larger, randomized trials are underway to confirm these early findings.