Layla is right about seeing your surgeon (not the PA; insist on seeing your doctor) if you have new pains associated with your knee and because the pain on your lateral side has dramatically impacted your ability to stand and walk. It is likely that your problem is with the IT band, from what you describe. It may also help to meet with your physical therapist for some treatment if it is determined to be the IT band. Discuss this with your surgeon. This type of problem can be difficult to resolve and the sooner you get a good diagnosis, the better.