“…Although TKA is one of the most commonly and increasingly performed surgical procedures in the world, there is limited information for younger, high-demand patients in regard to return to work ( Table 4). The existing published studies on return to work after TKA are limited by several factors: (1) there is a wide range in expected recovery time after knee arthroplasty in published studies ranging from 4 to 9 weeks in three US studies [9,17,18] to as high as 12 months in one study [2]; (2) the patient cohorts were small (\ 120 TKAs) [2,4,9,10]; (3) the average patient age was older than 65 years [3,13,18,19]; (4) the study included low-demand patients [3,4,13,18,19]; (5) the study was reported in the literature more than 10 years ago [4,13,19]; and (6) the study was not designed specifically to analyze return to work [3,9,19]. The purpose of this multicenter study was to determine whether young patients who were working before undergoing primary TKA are able to return to work postoperatively and to determine whether the patient's preoperative job physical demand category has an effect on ability to return to work.…”