Osteo-Arthritis can be controlled partially by diet. I was told by my uncle (a physician) many years ago that tea, nuts, tomatoes, and many other foods can cause the symptoms that manifest themselves into arthritis and one of the few foods that really help you is avocado. We make a lot of home made guacamole here as I have a solid history of arthritis in my family. Omega 3 supplements work as a natural anti-inflammatory and also reduce your intestine's sensitivity and immune system being over reactive which is a primary cause of arthritis.
Western doctors will want to fill you full of pharmaceuticals but in my experiences around the world, what you eat is just as important.
Best of luck.
CDN RH