<s>[INST] I just had a l total knee with removal of PCL.  Rehab went well.  Since returning to work as a nurse i have developed pain upper calf and lower thigh on the exterior side.  This feels like ache worse when I have been sitting for a while.  Knee joint does not hurt.  Any thoights. [/INST] hello there , although you have not mentioned the time duration since appearing of symptoms and the surgery what I can suggest to you are the following- PCL ( posterior cruciate ligament ) sacrificing knee replacment are the most commonly done knee replacement surgeries , and the design itself will   mimic the function of PCL and this is not the cause of pain as per your description— the pain you are describing co relate with HAMSTRING STRAIN which occurs in some patients , as prior to surgery because of advanced arthritis these     these muscles have not been used much.  now because of improved knee movement this muscles have started again taking the weight—-  very rarely this may occur due to venous stasis and DVT ( deep vein thrombosis)   this you can have it checked with your physician if the symptoms        persisthope I have been of help to youthanks </s>