Animal, bone-on-bone will never improve. If you're 50 you shouldn't get replacement surgery but if your 60-65 you should. New materials can last 15 years now. I'm soon to be under-the knife after 10 years of limping around and advil. Sports and climbing and landscaping on the side screwed my knee. When there is no cartilage there is no improvement. Ask Dustin Pedroia.
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