Hello,My name isXXXXX and I will be helping you today.A sudden significant swelling with a recent history ( a week ago) of knee replacement surgery would warrant an examination by the doctor. The chance of deep vein thrombosis is not much likely but we work on the extreme caution during the two weeks post operative period. So going to ER would be recommended, where the doctor may consider getting an ultrasound (colored doppler study) and a D-dimer blood test, just for the prophylactic reason.Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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