I have an unstable knee cap - am told cartilage gone - but actually I have practically no pain. However, I do limp severely and avoid steps and stairs as leg feels as if it would give out. More I walk, weaker it feels... I am considering total knee replacement in order that I could walk better, faster, and up steps. I feel a knee replacement is inevitable so might as well have it performed now. Anyone have a replacement to correct a severe limp? I do not have pain at all sitting or lying . Limping (strong limping) makes for a limited lifestyle. My doctor says it is up to me!