I recently (4 days) had both operated on and taken out. I am just trying to touch base with any other people who have had this as I feel a bit at a loss. I had a knee replaced a couple of years ago and found the help and support of the group to be so helpful. I feel as if my kidneys are not wroking properly. I have been drinking lots of water but passing little urine. What I do pass is "normal" light in colour and clear. Ks it just post operative pain?