question: Sir my mother aged 66 years is a cancer patient and her treatment is going on TMH Mumbai since March' 2012.  Now she has trouble in left knee and feeling too much pain and not able to walk. Her left leg swelled last week. Her blood report for thyroid stimulating harmone is 3.91.  Our family doctor told that this is age factor. I want to know the cause of pain in left knee and to be got appointment with better treatment