“…As the annual volume of primary TKAs performed in the United States is anticipated to exceed 3 million by the year 2030, with hospital costs exceeding 2 billion dollars [Kurtz et al, 2007;Lavernia et al, 2006], the number of dissatisfied patients will rise accordingly. These trends combined with an increase in life expectancy, as well as the desire to maintain a more active lifestyle in patients who are now undergoing TKA at a younger age [Goh et al, 2016;McCalden et al, 2013], warrants further research to identify the underlying reasons of sub-optimal knee function postoperatively.…”