For many people with knee osteoarthritis, the hardest part is not getting a diagnosis. It is living in the awkward middle, where pills, physical therapy, and injections no longer do enough, but knee replacement still feels too big, too risky, or simply too soon.
A new study suggests that a minimally invasive treatment may help some patients stay in that middle ground longer.
The procedure, called genicular artery embolization, reduced pain and improved movement for at least one year in adults whose usual treatments had stopped giving enough relief.
A painful treatment gap
Osteoarthritis is the most common form of arthritis. It happens when the whole joint changes over time, leading to pain, swelling, stiffness, and less freedom of movement.
The knee is especially vulnerable. The World Health Organization says about 528 million people were living with osteoarthritis in 2019, and the knee was the most affected joint, with about 365 million cases.
That is why the treatment gap matters. Conservative care can help many people, but not everyone gets lasting relief. Knee replacement can be life changing, but it is major surgery.
How the procedure works
Genicular artery embolization is a mouthful, but the idea is easier than the name. “Genicular” refers to blood vessels around the knee, and “embolization” means deliberately blocking selected vessels.
In an arthritic knee, extra abnormal blood vessels can form near inflamed tissue. Those vessels may feed swelling and pain signals, almost like keeping a small fire smoldering.
During the procedure, a specialist guides a thin tube through the blood vessels using live imaging. Tiny gelatin-based particles are then placed into targeted vessels, where they block abnormal blood flow and dissolve within hours.
Nearly 200 patients studied
The study followed 194 people with knee pain related to osteoarthritis. The group included 114 women and 80 men, and the median age was 69.
All had tried at least three months of conservative care, including physical therapy, anti-inflammatory medicine, and injections inside the joint. In practical terms, these were not patients looking for a first step, they were looking for the next one.
Dr. Florian Nima Fleckenstein, deputy head of Interventional Radiology Campus Mitte at Charité – Universitätsmedizin Berlin, said the results carried weight because they came from real-world data. “Our participants are exactly the patients that physicians encounter every day in their practices,” he said.
Pain scores dropped
Between July and November 2024, the patients underwent 239 procedures since some had both knees treated. Every procedure was technically successful, and no moderate or severe adverse events were reported.
Pain improved quickly. On a 0 to 10 pain scale, the median score fell from 7 before treatment to 4 after six weeks, then to 3 at both six months and 12 months.
That may sound like a small set of numbers, but for someone planning the day around knee pain, it can be meaningful. Less pain may mean easier stairs, fewer grimaces during errands, or a walk around the block that no longer feels like a test.
Movement also improved
The researchers also looked at daily activity, sports and recreation, symptoms, pain, and quality of life. Scores improved across all of those areas after treatment.
At the 12-month mark, 80% of participants had pain improvement large enough to pass a common threshold for a clinically meaningful change. That means the change was not just visible on a chart. For most patients, it was big enough to matter in daily life.
Still, this is not the same as rebuilding worn cartilage. The treatment is aimed at calming abnormal blood flow and inflammation around the knee, not reversing every part of osteoarthritis.
Why blood vessels matter
For a long time, knee osteoarthritis was often described as simple “wear and tear.” That phrase is familiar, but it misses part of the story.
Current research increasingly treats the condition as a whole-joint disease involving cartilage, bone, inflammation, blood vessels, and nerves. A 2026 position statement said genicular artery embolization may help selected patients when symptoms are driven by inflammation as well as degeneration.
That is where precision matters. Doctors are not trying to shut down normal circulation, they are trying to target abnormal vessels while protecting healthy blood flow.
Not a cure for everyone
The results are encouraging, but they do not make the procedure a guaranteed fix. The study followed patients forward in time, but it was done at one center and did not compare treated patients with a placebo group or another therapy.
A 2025 systematic review of 23 studies called the approach promising for people who did not respond to conservative treatment or were not good candidates for surgery. But it also said higher-quality trials are still needed to confirm long-term effectiveness.
That caution matters. For the most part, this treatment is best understood as a possible bridge between injections and knee replacement, not as a reason to skip a careful medical evaluation.
What it could change
At the end of the day, this research is trying to solve a very practical problem. What can doctors offer when the knee still hurts, but surgery is not the right next step?
For some patients, a single image-guided procedure could mean less pain and better movement for a year. Not a miracle, but still, a year of easier stairs and fewer painful walks is not a small thing.
The main study has been published in Radiology.
