This is actually NOT true.  When studies show that addicts start out by using prescription pills, this does not necessarily mean they are using pills prescribed to them by a doctor.  More often than not, it means they are stealing pills prescribed to others (relatives, friends, illicit sales).  I will find a link about this. So, yes, prescription pills are a problem and they are over-prescribed but the bottom line is that people who enjoy getting high for recreation are stealing them.  These recreational users are not becoming addicted because they had knee surgery.  Get real.