This is totally normal after a surgery like this. You are dealing with a ton of inflammation which includes a LOT of fluid! When I had my knee replacements my legs looked like tree stumps. I had lost a lot of weight before my surgery too. I had to wear compression stockings for a while to help squeeze it up and out. Time will take care of this for you, but while you are healing continue to take your Cambridge as often as you can. You need the nutrients right now more then ever. Only add good protein sources and healthy whole foods fats. No grain or sugar or carby foods. These are all highly inflammatory and will add to the problem and your pain. Recovery can be exhausting and frustrating and pain meds can really mess with your head and cause depression so take it one day at a time and know that any weight gain is likely very temporary. Once you are recovered you can see where you are and take it from there. You have some wonderful pain free years ahead of you now!