My mom's knee replacement wound is red, should we be concerned? should we have it examined?

Yes, now !!!: Unfortunately this operation is very complex & involves putting a foreign material into the body. They can become infected near the skin surface or deep inside the knee compartment. Quick & aggressive treatment can sometimes end the infection and preserve the appliance, but it might get so bad the appliance would be at risk. Call immediately and pack a bag.

This is especially -: -important to be seen if it’s a recent surgery, such as a couple of weeks or less. If this is in a knee that was done a while ago it’s also very important to be seen as late infections are very hard to treat. So get in to your surgeon now.