Radiation to treat osteoarthritis? This sounds like BS to my ears. I've been dealing with osteoarthritis in my left knee for over 40 years. And now I've developed it in my other knee, along with both hips, my neck, hands, right elbow, and lower back. I'm in chronic pain 24/7 from this insidious condition, in addition to having idiopathic poly neuropathy in both feet.
Even after decades of pain not a single doctor that I've seen has even hinted at something like that being a viable option. Is this something your doctor has referred to?