knee Anyone know why this might have happened?

im post op 5 weeks and down 34lbs. My knees havent hurt at all since i started losing the weight. Then last night im going down a steep flight of stairs and i feel something tweek in my knee. I can put weight on it and bend it forward but anytime i try to straighten it such as you would to lock your knees, it pulls again and isnt very much fun. anyone else have this problem with their knees?

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