Aimrr,
Always glad to meet new friends, but so sorry its this way! I will more then likely say, yes its normal. anytime you have your knee affected in such a way it will affect your foot. I have read that all of us have a swollen foot, foot pain, ankle pain etc. I would also think that your knee will give you fits on and off for awhile.
Besides walking on crutches and a hinged brace, what else do they tell you to do? Have they offered physical therapy to you?