I have had arthrofibrosis (scar tissue) and that tight band feeling for four years. Had an MUA (manipulation under anesthesia). That, along with intensive P.T. got me to 110 degrees for a week. Three months later had another MUA but with a scope. When the Dr. saw how much scar tissue was in there he performed lysis of adhesions. Again, daily P.T. for a month. It helped somewhat, but the knee is still not nearly what I would like. Maybe 90 degrees. Try to find an AF specialist in your area. Unfortunately, there does not seem to be a magical pill or surgery to help those of us with scarring.