I am contemplating knee replacement (both knees) late next year. the reason for the delay is that I am a competing athlete, and I want to compete internationally next August - even though I am handicapped with my knees now (bone on bone and femur damaged), I don't want to significantly change my body until after that major competition. My concern is this: All my life, I've had knee pronation, and very very flat feet to go with it. After knee replacement, I'm pretty sure the pronation problem can be dealt with. However, will my very flat feet make my new knees want to pronate too? will my muscles have problems/cramps due to the very unfamiliar "posture" of my legs? Will I have to have something done to my feet in addition to my knees? Will my potential surgeon understand this, since he/she will be a knee specialist?