E.M.
It could, but you could end up doing what my hubby's aunt did: She got a lap band, lost 145 lbs in about 3 months. However, as soon as she got to where she was comfortable again, she started eating and eating and completely undid what she accomplished. The absolute best thing you can do right now is eat right, move in whatever way you can, get plenty of sleep, and drink lots of water. Lay off the carbs, processed foods, sugar. Learn portion control. I guarantee you that as soon as a few pounds come off, you'll feel better and will be able to move better, thus helping your knees. This, in turn, will help the weight come off and you'll become the person you want and need to be--without surgery. Take it from me. I'm in the same boat you are and am doing it on my own.