Hi i am Dr Ahmed Aly thanks for using HealthcareMagic site , I had gone through your question and understand your concerns .. In my opinion you may have a kind of vascular injury or insufficiency . from your given history you mentioned taking anti inflammatory painkillers daypro ,fluids and nowadays a bit inactive .your surgeon mentioned avoiding sitting and bent knees while using your computer to decrease your blood stasis . Venous blood moves from your legs towards the heart opposing gravity , standing or bending your knees for a long time will make more blood in your lower limb , if your venous system is clear from any kind of occlusion or obstruction blood will freely move toward the heart . For now i recommend you decrease your weight and elevate your feet upon a pillow while relaxing , wearing compression stockings will prevent further blood from staying in your legs also avoid bending your knees to prevent bending your blood vessels and narrowing them . Doppler U/S on your lower limbs blood vessel to rule if you have any minor clot or DVT ( deep vein thrombosis ) thus decreasing your venous return and swelling of your legs . ask your surgeon for proper thrombolytic drug and dosing and try to be more physically active and i do not think your swelling is related with any kind of infection i think you have a vascular problem . elevation and previous instructins will be helpful for most of cases if swelling persists i recommend visiting your surgeon for proper evaluation and management to prevent further complications which in some cases is very serious . Please click and consider a 5 star rating with some positive feedback if the information was helpful. Wish you good health, Any further clarifications feel free to ask.