How come i still have so much pain two years after total knee replacement?

Get evaluated: This issue needs evaluation. The two major causes are infection and loosening. See the orthopedist who performed the replacement if possible but see someone.

Many things: There are a number of things that can cause pain. Infection should be ruled out first. If it is not infected, xrays should be done to verify the components are not getting loose, a bone scan is also a possiblity. A rare cause is metal sensitivity, but this is controversial. Sometimes impinging scar tissue in the knee can cause it, or it can be refered pain from the hip.