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As a personal trainer, I have worked with many clients with knee problems. The first thing you need to do is really work on strenghth and stability. The stronger your quads, hamstrings, and especially your glutes are the more stability you are going to have in your knees. It is very important you are working with a good physical therapist, because that is what makes the difference. I would definitely give up any running or jogging and stick with either walking, biking, or an ellyptical machine. But the strength and stability training is what will make the most difference. The exercise really does make a difference and I have seen people avoid surgery, but you need to do the work. If you have any questions, feel free to contact me ____@____.com or you can call me at ###-###-#### ext.222. Good luck!