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I don't have any cartilage in my left ankle and so any time I move it too much or put too much stress on it it locks up and the bones rub against each other and it hurts like all hell. Which meant I couldn't do too much running and so playing football and running track just dropped from my list of things I enjoy. They did some operation on it where they cut into it from both sides of my ankle and then drilled away at my bone to try and stimulate the cartilage into growing, which didn't end up working and I think it might even be worse now.