This means that 20% of the 1,000,000 people who get joint replacement surgery every year are junkies. I must live in a bubble, because I know quite a few JRS patients, none of whom are addicts.
What I do know is that because of assholes like the authors of OPs cited article, I had a devil of a time filling gf's scripts in Chicago after her first knee replacement. After the second one, we made a point of getting them filled at the hospital, way out in Winfield (home of Cantigny museum for you history buffs).