Anyone knows the diference...

Both are similar. Where arthritis affects mostly the joints and connecting muscles and ligaments, arthrosis affects the cartiledge. From what I've read, your doctor is giving you the correct treatment for it. The important thing too, is to stay active, so you absolutely should plan on that vegetable garden next year. You might want to discuss with your doctor what forms of excercise would be most beneficial. An aunt of mine who also has arthrosis and arthritis, at the recommendation of her doctor, has enrolled in a tai chi class. She just started though, so I can't tell you if it's helping. A good reference website is webmd.com