i've had the same problem. tore the cartilage in my left knee. arthroscopy didn't locate the issue, so i went a year having knee problems. i'd be walking and my knee would just give out on me and i'd fall. they finally opened my knee up and found about 3" of loose cartilage that they removed. i'd say it pretty much fixed the problem, but my knee is still not the same and it catches and i have to "pop" it (same kind of feeling as cracking your knuckles) to get it "unlocked." but i guess surgery did fix the falling down problem ... now if that happens it's probably from alcohol intake - HA!!! good luck with your surgery.
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